Adding upstream version 1.20.14.upstream/1.20.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1066 insertions, 0 deletions

diff --git a/src/time/format_test.go b/src/time/format_test.go
new file mode 100644
index 0000000..8a26eaa
--- /dev/null
+++ b/src/time/format_test.go
@@ -0,0 +1,1066 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package time_test
+
+import (
+	"bytes"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"testing"
+	"testing/quick"
+	. "time"
+)
+
+var nextStdChunkTests = []string{
+	"(2006)-(01)-(02)T(15):(04):(05)(Z07:00)",
+	"(2006)-(01)-(02) (002) (15):(04):(05)",
+	"(2006)-(01) (002) (15):(04):(05)",
+	"(2006)-(002) (15):(04):(05)",
+	"(2006)(002)(01) (15):(04):(05)",
+	"(2006)(002)(04) (15):(04):(05)",
+}
+
+func TestNextStdChunk(t *testing.T) {
+	// Most bugs in Parse or Format boil down to problems with
+	// the exact detection of format chunk boundaries in the
+	// helper function nextStdChunk (here called as NextStdChunk).
+	// This test checks nextStdChunk's behavior directly,
+	// instead of needing to test it only indirectly through Parse/Format.
+
+	// markChunks returns format with each detected
+	// 'format chunk' parenthesized.
+	// For example showChunks("2006-01-02") == "(2006)-(01)-(02)".
+	markChunks := func(format string) string {
+		// Note that NextStdChunk and StdChunkNames
+		// are not part of time's public API.
+		// They are exported in export_test for this test.
+		out := ""
+		for s := format; s != ""; {
+			prefix, std, suffix := NextStdChunk(s)
+			out += prefix
+			if std > 0 {
+				out += "(" + StdChunkNames[std] + ")"
+			}
+			s = suffix
+		}
+		return out
+	}
+
+	noParens := func(r rune) rune {
+		if r == '(' || r == ')' {
+			return -1
+		}
+		return r
+	}
+
+	for _, marked := range nextStdChunkTests {
+		// marked is an expected output from markChunks.
+		// If we delete the parens and pass it through markChunks,
+		// we should get the original back.
+		format := strings.Map(noParens, marked)
+		out := markChunks(format)
+		if out != marked {
+			t.Errorf("nextStdChunk parses %q as %q, want %q", format, out, marked)
+		}
+	}
+}
+
+type TimeFormatTest struct {
+	time           Time
+	formattedValue string
+}
+
+var rfc3339Formats = []TimeFormatTest{
+	{Date(2008, 9, 17, 20, 4, 26, 0, UTC), "2008-09-17T20:04:26Z"},
+	{Date(1994, 9, 17, 20, 4, 26, 0, FixedZone("EST", -18000)), "1994-09-17T20:04:26-05:00"},
+	{Date(2000, 12, 26, 1, 15, 6, 0, FixedZone("OTO", 15600)), "2000-12-26T01:15:06+04:20"},
+}
+
+func TestRFC3339Conversion(t *testing.T) {
+	for _, f := range rfc3339Formats {
+		if f.time.Format(RFC3339) != f.formattedValue {
+			t.Error("RFC3339:")
+			t.Errorf("  want=%+v", f.formattedValue)
+			t.Errorf("  have=%+v", f.time.Format(RFC3339))
+		}
+	}
+}
+
+func TestAppendInt(t *testing.T) {
+	tests := []struct {
+		in    int
+		width int
+		want  string
+	}{
+		{0, 0, "0"},
+		{0, 1, "0"},
+		{0, 2, "00"},
+		{0, 3, "000"},
+		{1, 0, "1"},
+		{1, 1, "1"},
+		{1, 2, "01"},
+		{1, 3, "001"},
+		{-1, 0, "-1"},
+		{-1, 1, "-1"},
+		{-1, 2, "-01"},
+		{-1, 3, "-001"},
+		{99, 2, "99"},
+		{100, 2, "100"},
+		{1, 4, "0001"},
+		{12, 4, "0012"},
+		{123, 4, "0123"},
+		{1234, 4, "1234"},
+		{12345, 4, "12345"},
+		{1, 5, "00001"},
+		{12, 5, "00012"},
+		{123, 5, "00123"},
+		{1234, 5, "01234"},
+		{12345, 5, "12345"},
+		{123456, 5, "123456"},
+		{0, 9, "000000000"},
+		{123, 9, "000000123"},
+		{123456, 9, "000123456"},
+		{123456789, 9, "123456789"},
+	}
+	var got []byte
+	for _, tt := range tests {
+		got = AppendInt(got[:0], tt.in, tt.width)
+		if string(got) != tt.want {
+			t.Errorf("appendInt(%d, %d) = %s, want %s", tt.in, tt.width, got, tt.want)
+		}
+	}
+}
+
+type FormatTest struct {
+	name   string
+	format string
+	result string
+}
+
+var formatTests = []FormatTest{
+	{"ANSIC", ANSIC, "Wed Feb  4 21:00:57 2009"},
+	{"UnixDate", UnixDate, "Wed Feb  4 21:00:57 PST 2009"},
+	{"RubyDate", RubyDate, "Wed Feb 04 21:00:57 -0800 2009"},
+	{"RFC822", RFC822, "04 Feb 09 21:00 PST"},
+	{"RFC850", RFC850, "Wednesday, 04-Feb-09 21:00:57 PST"},
+	{"RFC1123", RFC1123, "Wed, 04 Feb 2009 21:00:57 PST"},
+	{"RFC1123Z", RFC1123Z, "Wed, 04 Feb 2009 21:00:57 -0800"},
+	{"RFC3339", RFC3339, "2009-02-04T21:00:57-08:00"},
+	{"RFC3339Nano", RFC3339Nano, "2009-02-04T21:00:57.0123456-08:00"},
+	{"Kitchen", Kitchen, "9:00PM"},
+	{"am/pm", "3pm", "9pm"},
+	{"AM/PM", "3PM", "9PM"},
+	{"two-digit year", "06 01 02", "09 02 04"},
+	// Three-letter months and days must not be followed by lower-case letter.
+	{"Janet", "Hi Janet, the Month is January", "Hi Janet, the Month is February"},
+	// Time stamps, Fractional seconds.
+	{"Stamp", Stamp, "Feb  4 21:00:57"},
+	{"StampMilli", StampMilli, "Feb  4 21:00:57.012"},
+	{"StampMicro", StampMicro, "Feb  4 21:00:57.012345"},
+	{"StampNano", StampNano, "Feb  4 21:00:57.012345600"},
+	{"DateTime", DateTime, "2009-02-04 21:00:57"},
+	{"DateOnly", DateOnly, "2009-02-04"},
+	{"TimeOnly", TimeOnly, "21:00:57"},
+	{"YearDay", "Jan  2 002 __2 2", "Feb  4 035  35 4"},
+	{"Year", "2006 6 06 _6 __6 ___6", "2009 6 09 _6 __6 ___6"},
+	{"Month", "Jan January 1 01 _1", "Feb February 2 02 _2"},
+	{"DayOfMonth", "2 02 _2 __2", "4 04  4  35"},
+	{"DayOfWeek", "Mon Monday", "Wed Wednesday"},
+	{"Hour", "15 3 03 _3", "21 9 09 _9"},
+	{"Minute", "4 04 _4", "0 00 _0"},
+	{"Second", "5 05 _5", "57 57 _57"},
+}
+
+func TestFormat(t *testing.T) {
+	// The numeric time represents Thu Feb  4 21:00:57.012345600 PST 2009
+	time := Unix(0, 1233810057012345600)
+	for _, test := range formatTests {
+		result := time.Format(test.format)
+		if result != test.result {
+			t.Errorf("%s expected %q got %q", test.name, test.result, result)
+		}
+	}
+}
+
+var goStringTests = []struct {
+	in   Time
+	want string
+}{
+	{Date(2009, February, 5, 5, 0, 57, 12345600, UTC),
+		"time.Date(2009, time.February, 5, 5, 0, 57, 12345600, time.UTC)"},
+	{Date(2009, February, 5, 5, 0, 57, 12345600, Local),
+		"time.Date(2009, time.February, 5, 5, 0, 57, 12345600, time.Local)"},
+	{Date(2009, February, 5, 5, 0, 57, 12345600, FixedZone("Europe/Berlin", 3*60*60)),
+		`time.Date(2009, time.February, 5, 5, 0, 57, 12345600, time.Location("Europe/Berlin"))`,
+	},
+	{Date(2009, February, 5, 5, 0, 57, 12345600, FixedZone("Non-ASCII character ⏰", 3*60*60)),
+		`time.Date(2009, time.February, 5, 5, 0, 57, 12345600, time.Location("Non-ASCII character \xe2\x8f\xb0"))`,
+	},
+}
+
+func TestGoString(t *testing.T) {
+	// The numeric time represents Thu Feb  4 21:00:57.012345600 PST 2009
+	for _, tt := range goStringTests {
+		if tt.in.GoString() != tt.want {
+			t.Errorf("GoString (%q): got %q want %q", tt.in, tt.in.GoString(), tt.want)
+		}
+	}
+}
+
+// issue 12440.
+func TestFormatSingleDigits(t *testing.T) {
+	time := Date(2001, 2, 3, 4, 5, 6, 700000000, UTC)
+	test := FormatTest{"single digit format", "3:4:5", "4:5:6"}
+	result := time.Format(test.format)
+	if result != test.result {
+		t.Errorf("%s expected %q got %q", test.name, test.result, result)
+	}
+}
+
+func TestFormatShortYear(t *testing.T) {
+	years := []int{
+		-100001, -100000, -99999,
+		-10001, -10000, -9999,
+		-1001, -1000, -999,
+		-101, -100, -99,
+		-11, -10, -9,
+		-1, 0, 1,
+		9, 10, 11,
+		99, 100, 101,
+		999, 1000, 1001,
+		9999, 10000, 10001,
+		99999, 100000, 100001,
+	}
+
+	for _, y := range years {
+		time := Date(y, January, 1, 0, 0, 0, 0, UTC)
+		result := time.Format("2006.01.02")
+		var want string
+		if y < 0 {
+			// The 4 in %04d counts the - sign, so print -y instead
+			// and introduce our own - sign.
+			want = fmt.Sprintf("-%04d.%02d.%02d", -y, 1, 1)
+		} else {
+			want = fmt.Sprintf("%04d.%02d.%02d", y, 1, 1)
+		}
+		if result != want {
+			t.Errorf("(jan 1 %d).Format(\"2006.01.02\") = %q, want %q", y, result, want)
+		}
+	}
+}
+
+type ParseTest struct {
+	name       string
+	format     string
+	value      string
+	hasTZ      bool // contains a time zone
+	hasWD      bool // contains a weekday
+	yearSign   int  // sign of year, -1 indicates the year is not present in the format
+	fracDigits int  // number of digits of fractional second
+}
+
+var parseTests = []ParseTest{
+	{"ANSIC", ANSIC, "Thu Feb  4 21:00:57 2010", false, true, 1, 0},
+	{"UnixDate", UnixDate, "Thu Feb  4 21:00:57 PST 2010", true, true, 1, 0},
+	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0800 2010", true, true, 1, 0},
+	{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57 PST", true, true, 1, 0},
+	{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57 PST", true, true, 1, 0},
+	{"RFC1123", RFC1123, "Thu, 04 Feb 2010 22:00:57 PDT", true, true, 1, 0},
+	{"RFC1123Z", RFC1123Z, "Thu, 04 Feb 2010 21:00:57 -0800", true, true, 1, 0},
+	{"RFC3339", RFC3339, "2010-02-04T21:00:57-08:00", true, false, 1, 0},
+	{"custom: \"2006-01-02 15:04:05-07\"", "2006-01-02 15:04:05-07", "2010-02-04 21:00:57-08", true, false, 1, 0},
+	// Optional fractional seconds.
+	{"ANSIC", ANSIC, "Thu Feb  4 21:00:57.0 2010", false, true, 1, 1},
+	{"UnixDate", UnixDate, "Thu Feb  4 21:00:57.01 PST 2010", true, true, 1, 2},
+	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57.012 -0800 2010", true, true, 1, 3},
+	{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57.0123 PST", true, true, 1, 4},
+	{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57.01234 PST", true, true, 1, 5},
+	{"RFC1123Z", RFC1123Z, "Thu, 04 Feb 2010 21:00:57.01234 -0800", true, true, 1, 5},
+	{"RFC3339", RFC3339, "2010-02-04T21:00:57.012345678-08:00", true, false, 1, 9},
+	{"custom: \"2006-01-02 15:04:05\"", "2006-01-02 15:04:05", "2010-02-04 21:00:57.0", false, false, 1, 0},
+	// Amount of white space should not matter.
+	{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1, 0},
+	{"ANSIC", ANSIC, "Thu      Feb     4     21:00:57     2010", false, true, 1, 0},
+	// Case should not matter
+	{"ANSIC", ANSIC, "THU FEB 4 21:00:57 2010", false, true, 1, 0},
+	{"ANSIC", ANSIC, "thu feb 4 21:00:57 2010", false, true, 1, 0},
+	// Fractional seconds.
+	{"millisecond:: dot separator", "Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 21:00:57.012 2010", false, true, 1, 3},
+	{"microsecond:: dot separator", "Mon Jan _2 15:04:05.000000 2006", "Thu Feb  4 21:00:57.012345 2010", false, true, 1, 6},
+	{"nanosecond:: dot separator", "Mon Jan _2 15:04:05.000000000 2006", "Thu Feb  4 21:00:57.012345678 2010", false, true, 1, 9},
+	{"millisecond:: comma separator", "Mon Jan _2 15:04:05,000 2006", "Thu Feb  4 21:00:57.012 2010", false, true, 1, 3},
+	{"microsecond:: comma separator", "Mon Jan _2 15:04:05,000000 2006", "Thu Feb  4 21:00:57.012345 2010", false, true, 1, 6},
+	{"nanosecond:: comma separator", "Mon Jan _2 15:04:05,000000000 2006", "Thu Feb  4 21:00:57.012345678 2010", false, true, 1, 9},
+
+	// Leading zeros in other places should not be taken as fractional seconds.
+	{"zero1", "2006.01.02.15.04.05.0", "2010.02.04.21.00.57.0", false, false, 1, 1},
+	{"zero2", "2006.01.02.15.04.05.00", "2010.02.04.21.00.57.01", false, false, 1, 2},
+	// Month and day names only match when not followed by a lower-case letter.
+	{"Janet", "Hi Janet, the Month is January: Jan _2 15:04:05 2006", "Hi Janet, the Month is February: Feb  4 21:00:57 2010", false, true, 1, 0},
+
+	// GMT with offset.
+	{"GMT-8", UnixDate, "Fri Feb  5 05:00:57 GMT-8 2010", true, true, 1, 0},
+
+	// Accept any number of fractional second digits (including none) for .999...
+	// In Go 1, .999... was completely ignored in the format, meaning the first two
+	// cases would succeed, but the next four would not. Go 1.1 accepts all six.
+	// decimal "." separator.
+	{"", "2006-01-02 15:04:05.9999 -0700 MST", "2010-02-04 21:00:57 -0800 PST", true, false, 1, 0},
+	{"", "2006-01-02 15:04:05.999999999 -0700 MST", "2010-02-04 21:00:57 -0800 PST", true, false, 1, 0},
+	{"", "2006-01-02 15:04:05.9999 -0700 MST", "2010-02-04 21:00:57.0123 -0800 PST", true, false, 1, 4},
+	{"", "2006-01-02 15:04:05.999999999 -0700 MST", "2010-02-04 21:00:57.0123 -0800 PST", true, false, 1, 4},
+	{"", "2006-01-02 15:04:05.9999 -0700 MST", "2010-02-04 21:00:57.012345678 -0800 PST", true, false, 1, 9},
+	{"", "2006-01-02 15:04:05.999999999 -0700 MST", "2010-02-04 21:00:57.012345678 -0800 PST", true, false, 1, 9},
+	// comma "," separator.
+	{"", "2006-01-02 15:04:05,9999 -0700 MST", "2010-02-04 21:00:57 -0800 PST", true, false, 1, 0},
+	{"", "2006-01-02 15:04:05,999999999 -0700 MST", "2010-02-04 21:00:57 -0800 PST", true, false, 1, 0},
+	{"", "2006-01-02 15:04:05,9999 -0700 MST", "2010-02-04 21:00:57.0123 -0800 PST", true, false, 1, 4},
+	{"", "2006-01-02 15:04:05,999999999 -0700 MST", "2010-02-04 21:00:57.0123 -0800 PST", true, false, 1, 4},
+	{"", "2006-01-02 15:04:05,9999 -0700 MST", "2010-02-04 21:00:57.012345678 -0800 PST", true, false, 1, 9},
+	{"", "2006-01-02 15:04:05,999999999 -0700 MST", "2010-02-04 21:00:57.012345678 -0800 PST", true, false, 1, 9},
+
+	// issue 4502.
+	{"", StampNano, "Feb  4 21:00:57.012345678", false, false, -1, 9},
+	{"", "Jan _2 15:04:05.999", "Feb  4 21:00:57.012300000", false, false, -1, 4},
+	{"", "Jan _2 15:04:05.999", "Feb  4 21:00:57.012345678", false, false, -1, 9},
+	{"", "Jan _2 15:04:05.999999999", "Feb  4 21:00:57.0123", false, false, -1, 4},
+	{"", "Jan _2 15:04:05.999999999", "Feb  4 21:00:57.012345678", false, false, -1, 9},
+
+	// Day of year.
+	{"", "2006-01-02 002 15:04:05", "2010-02-04 035 21:00:57", false, false, 1, 0},
+	{"", "2006-01 002 15:04:05", "2010-02 035 21:00:57", false, false, 1, 0},
+	{"", "2006-002 15:04:05", "2010-035 21:00:57", false, false, 1, 0},
+	{"", "200600201 15:04:05", "201003502 21:00:57", false, false, 1, 0},
+	{"", "200600204 15:04:05", "201003504 21:00:57", false, false, 1, 0},
+}
+
+func TestParse(t *testing.T) {
+	for _, test := range parseTests {
+		time, err := Parse(test.format, test.value)
+		if err != nil {
+			t.Errorf("%s error: %v", test.name, err)
+		} else {
+			checkTime(time, &test, t)
+		}
+	}
+}
+
+// All parsed with ANSIC.
+var dayOutOfRangeTests = []struct {
+	date string
+	ok   bool
+}{
+	{"Thu Jan 99 21:00:57 2010", false},
+	{"Thu Jan 31 21:00:57 2010", true},
+	{"Thu Jan 32 21:00:57 2010", false},
+	{"Thu Feb 28 21:00:57 2012", true},
+	{"Thu Feb 29 21:00:57 2012", true},
+	{"Thu Feb 29 21:00:57 2010", false},
+	{"Thu Mar 31 21:00:57 2010", true},
+	{"Thu Mar 32 21:00:57 2010", false},
+	{"Thu Apr 30 21:00:57 2010", true},
+	{"Thu Apr 31 21:00:57 2010", false},
+	{"Thu May 31 21:00:57 2010", true},
+	{"Thu May 32 21:00:57 2010", false},
+	{"Thu Jun 30 21:00:57 2010", true},
+	{"Thu Jun 31 21:00:57 2010", false},
+	{"Thu Jul 31 21:00:57 2010", true},
+	{"Thu Jul 32 21:00:57 2010", false},
+	{"Thu Aug 31 21:00:57 2010", true},
+	{"Thu Aug 32 21:00:57 2010", false},
+	{"Thu Sep 30 21:00:57 2010", true},
+	{"Thu Sep 31 21:00:57 2010", false},
+	{"Thu Oct 31 21:00:57 2010", true},
+	{"Thu Oct 32 21:00:57 2010", false},
+	{"Thu Nov 30 21:00:57 2010", true},
+	{"Thu Nov 31 21:00:57 2010", false},
+	{"Thu Dec 31 21:00:57 2010", true},
+	{"Thu Dec 32 21:00:57 2010", false},
+	{"Thu Dec 00 21:00:57 2010", false},
+}
+
+func TestParseDayOutOfRange(t *testing.T) {
+	for _, test := range dayOutOfRangeTests {
+		_, err := Parse(ANSIC, test.date)
+		switch {
+		case test.ok && err == nil:
+			// OK
+		case !test.ok && err != nil:
+			if !strings.Contains(err.Error(), "day out of range") {
+				t.Errorf("%q: expected 'day' error, got %v", test.date, err)
+			}
+		case test.ok && err != nil:
+			t.Errorf("%q: unexpected error: %v", test.date, err)
+		case !test.ok && err == nil:
+			t.Errorf("%q: expected 'day' error, got none", test.date)
+		}
+	}
+}
+
+// TestParseInLocation checks that the Parse and ParseInLocation
+// functions do not get confused by the fact that AST (Arabia Standard
+// Time) and AST (Atlantic Standard Time) are different time zones,
+// even though they have the same abbreviation.
+//
+// ICANN has been slowly phasing out invented abbreviation in favor of
+// numeric time zones (for example, the Asia/Baghdad time zone
+// abbreviation got changed from AST to +03 in the 2017a tzdata
+// release); but we still want to make sure that the time package does
+// not get confused on systems with slightly older tzdata packages.
+func TestParseInLocation(t *testing.T) {
+
+	baghdad, err := LoadLocation("Asia/Baghdad")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var t1, t2 Time
+
+	t1, err = ParseInLocation("Jan 02 2006 MST", "Feb 01 2013 AST", baghdad)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, offset := t1.Zone()
+
+	// A zero offset means that ParseInLocation did not recognize the
+	// 'AST' abbreviation as matching the current location (Baghdad,
+	// where we'd expect a +03 hrs offset); likely because we're using
+	// a recent tzdata release (2017a or newer).
+	// If it happens, skip the Baghdad test.
+	if offset != 0 {
+		t2 = Date(2013, February, 1, 00, 00, 00, 0, baghdad)
+		if t1 != t2 {
+			t.Fatalf("ParseInLocation(Feb 01 2013 AST, Baghdad) = %v, want %v", t1, t2)
+		}
+		if offset != 3*60*60 {
+			t.Fatalf("ParseInLocation(Feb 01 2013 AST, Baghdad).Zone = _, %d, want _, %d", offset, 3*60*60)
+		}
+	}
+
+	blancSablon, err := LoadLocation("America/Blanc-Sablon")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// In this case 'AST' means 'Atlantic Standard Time', and we
+	// expect the abbreviation to correctly match the american
+	// location.
+	t1, err = ParseInLocation("Jan 02 2006 MST", "Feb 01 2013 AST", blancSablon)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t2 = Date(2013, February, 1, 00, 00, 00, 0, blancSablon)
+	if t1 != t2 {
+		t.Fatalf("ParseInLocation(Feb 01 2013 AST, Blanc-Sablon) = %v, want %v", t1, t2)
+	}
+	_, offset = t1.Zone()
+	if offset != -4*60*60 {
+		t.Fatalf("ParseInLocation(Feb 01 2013 AST, Blanc-Sablon).Zone = _, %d, want _, %d", offset, -4*60*60)
+	}
+}
+
+func TestLoadLocationZipFile(t *testing.T) {
+	undo := DisablePlatformSources()
+	defer undo()
+
+	_, err := LoadLocation("Australia/Sydney")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+var rubyTests = []ParseTest{
+	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0800 2010", true, true, 1, 0},
+	// Ignore the time zone in the test. If it parses, it'll be OK.
+	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0000 2010", false, true, 1, 0},
+	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 +0000 2010", false, true, 1, 0},
+	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 +1130 2010", false, true, 1, 0},
+}
+
+// Problematic time zone format needs special tests.
+func TestRubyParse(t *testing.T) {
+	for _, test := range rubyTests {
+		time, err := Parse(test.format, test.value)
+		if err != nil {
+			t.Errorf("%s error: %v", test.name, err)
+		} else {
+			checkTime(time, &test, t)
+		}
+	}
+}
+
+func checkTime(time Time, test *ParseTest, t *testing.T) {
+	// The time should be Thu Feb  4 21:00:57 PST 2010
+	if test.yearSign >= 0 && test.yearSign*time.Year() != 2010 {
+		t.Errorf("%s: bad year: %d not %d", test.name, time.Year(), 2010)
+	}
+	if time.Month() != February {
+		t.Errorf("%s: bad month: %s not %s", test.name, time.Month(), February)
+	}
+	if time.Day() != 4 {
+		t.Errorf("%s: bad day: %d not %d", test.name, time.Day(), 4)
+	}
+	if time.Hour() != 21 {
+		t.Errorf("%s: bad hour: %d not %d", test.name, time.Hour(), 21)
+	}
+	if time.Minute() != 0 {
+		t.Errorf("%s: bad minute: %d not %d", test.name, time.Minute(), 0)
+	}
+	if time.Second() != 57 {
+		t.Errorf("%s: bad second: %d not %d", test.name, time.Second(), 57)
+	}
+	// Nanoseconds must be checked against the precision of the input.
+	nanosec, err := strconv.ParseUint("012345678"[:test.fracDigits]+"000000000"[:9-test.fracDigits], 10, 0)
+	if err != nil {
+		panic(err)
+	}
+	if time.Nanosecond() != int(nanosec) {
+		t.Errorf("%s: bad nanosecond: %d not %d", test.name, time.Nanosecond(), nanosec)
+	}
+	name, offset := time.Zone()
+	if test.hasTZ && offset != -28800 {
+		t.Errorf("%s: bad tz offset: %s %d not %d", test.name, name, offset, -28800)
+	}
+	if test.hasWD && time.Weekday() != Thursday {
+		t.Errorf("%s: bad weekday: %s not %s", test.name, time.Weekday(), Thursday)
+	}
+}
+
+func TestFormatAndParse(t *testing.T) {
+	const fmt = "Mon MST " + RFC3339 // all fields
+	f := func(sec int64) bool {
+		t1 := Unix(sec/2, 0)
+		if t1.Year() < 1000 || t1.Year() > 9999 || t1.Unix() != sec {
+			// not required to work
+			return true
+		}
+		t2, err := Parse(fmt, t1.Format(fmt))
+		if err != nil {
+			t.Errorf("error: %s", err)
+			return false
+		}
+		if t1.Unix() != t2.Unix() || t1.Nanosecond() != t2.Nanosecond() {
+			t.Errorf("FormatAndParse %d: %q(%d) %q(%d)", sec, t1, t1.Unix(), t2, t2.Unix())
+			return false
+		}
+		return true
+	}
+	f32 := func(sec int32) bool { return f(int64(sec)) }
+	cfg := &quick.Config{MaxCount: 10000}
+
+	// Try a reasonable date first, then the huge ones.
+	if err := quick.Check(f32, cfg); err != nil {
+		t.Fatal(err)
+	}
+	if err := quick.Check(f, cfg); err != nil {
+		t.Fatal(err)
+	}
+}
+
+type ParseTimeZoneTest struct {
+	value  string
+	length int
+	ok     bool
+}
+
+var parseTimeZoneTests = []ParseTimeZoneTest{
+	{"gmt hi there", 0, false},
+	{"GMT hi there", 3, true},
+	{"GMT+12 hi there", 6, true},
+	{"GMT+00 hi there", 6, true},
+	{"GMT+", 3, true},
+	{"GMT+3", 5, true},
+	{"GMT+a", 3, true},
+	{"GMT+3a", 5, true},
+	{"GMT-5 hi there", 5, true},
+	{"GMT-51 hi there", 3, true},
+	{"ChST hi there", 4, true},
+	{"MeST hi there", 4, true},
+	{"MSDx", 3, true},
+	{"MSDY", 0, false}, // four letters must end in T.
+	{"ESAST hi", 5, true},
+	{"ESASTT hi", 0, false}, // run of upper-case letters too long.
+	{"ESATY hi", 0, false},  // five letters must end in T.
+	{"WITA hi", 4, true},    // Issue #18251
+	// Issue #24071
+	{"+03 hi", 3, true},
+	{"-04 hi", 3, true},
+	// Issue #26032
+	{"+00", 3, true},
+	{"-11", 3, true},
+	{"-12", 3, true},
+	{"-23", 3, true},
+	{"-24", 0, false},
+	{"+13", 3, true},
+	{"+14", 3, true},
+	{"+23", 3, true},
+	{"+24", 0, false},
+}
+
+func TestParseTimeZone(t *testing.T) {
+	for _, test := range parseTimeZoneTests {
+		length, ok := ParseTimeZone(test.value)
+		if ok != test.ok {
+			t.Errorf("expected %t for %q got %t", test.ok, test.value, ok)
+		} else if length != test.length {
+			t.Errorf("expected %d for %q got %d", test.length, test.value, length)
+		}
+	}
+}
+
+type ParseErrorTest struct {
+	format string
+	value  string
+	expect string // must appear within the error
+}
+
+var parseErrorTests = []ParseErrorTest{
+	{ANSIC, "Feb  4 21:00:60 2010", `cannot parse "Feb  4 21:00:60 2010" as "Mon"`},
+	{ANSIC, "Thu Feb  4 21:00:57 @2010", `cannot parse "@2010" as "2006"`},
+	{ANSIC, "Thu Feb  4 21:00:60 2010", "second out of range"},
+	{ANSIC, "Thu Feb  4 21:61:57 2010", "minute out of range"},
+	{ANSIC, "Thu Feb  4 24:00:60 2010", "hour out of range"},
+	{"Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 23:00:59x01 2010", `cannot parse "x01 2010" as ".000"`},
+	{"Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 23:00:59.xxx 2010", `cannot parse ".xxx 2010" as ".000"`},
+	{"Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 23:00:59.-123 2010", "fractional second out of range"},
+	// issue 4502. StampNano requires exactly 9 digits of precision.
+	{StampNano, "Dec  7 11:22:01.000000", `cannot parse ".000000" as ".000000000"`},
+	{StampNano, "Dec  7 11:22:01.0000000000", `extra text: "0"`},
+	// issue 4493. Helpful errors.
+	{RFC3339, "2006-01-02T15:04:05Z07:00", `parsing time "2006-01-02T15:04:05Z07:00": extra text: "07:00"`},
+	{RFC3339, "2006-01-02T15:04_abc", `parsing time "2006-01-02T15:04_abc" as "2006-01-02T15:04:05Z07:00": cannot parse "_abc" as ":"`},
+	{RFC3339, "2006-01-02T15:04:05_abc", `parsing time "2006-01-02T15:04:05_abc" as "2006-01-02T15:04:05Z07:00": cannot parse "_abc" as "Z07:00"`},
+	{RFC3339, "2006-01-02T15:04:05Z_abc", `parsing time "2006-01-02T15:04:05Z_abc": extra text: "_abc"`},
+	// invalid second followed by optional fractional seconds
+	{RFC3339, "2010-02-04T21:00:67.012345678-08:00", "second out of range"},
+	// issue 54569
+	{RFC3339, "0000-01-01T00:00:.0+00:00", `parsing time "0000-01-01T00:00:.0+00:00" as "2006-01-02T15:04:05Z07:00": cannot parse ".0+00:00" as "05"`},
+	// issue 21113
+	{"_2 Jan 06 15:04 MST", "4 --- 00 00:00 GMT", `cannot parse "--- 00 00:00 GMT" as "Jan"`},
+	{"_2 January 06 15:04 MST", "4 --- 00 00:00 GMT", `cannot parse "--- 00 00:00 GMT" as "January"`},
+
+	// invalid or mismatched day-of-year
+	{"Jan _2 002 2006", "Feb  4 034 2006", "day-of-year does not match day"},
+	{"Jan _2 002 2006", "Feb  4 004 2006", "day-of-year does not match month"},
+
+	// issue 45391.
+	{`"2006-01-02T15:04:05Z07:00"`, "0", `parsing time "0" as "\"2006-01-02T15:04:05Z07:00\"": cannot parse "0" as "\""`},
+	{RFC3339, "\"", `parsing time "\"" as "2006-01-02T15:04:05Z07:00": cannot parse "\"" as "2006"`},
+
+	// issue 54570
+	{RFC3339, "0000-01-01T00:00:00+00:+0", `parsing time "0000-01-01T00:00:00+00:+0" as "2006-01-02T15:04:05Z07:00": cannot parse "+00:+0" as "Z07:00"`},
+	{RFC3339, "0000-01-01T00:00:00+-0:00", `parsing time "0000-01-01T00:00:00+-0:00" as "2006-01-02T15:04:05Z07:00": cannot parse "+-0:00" as "Z07:00"`},
+
+	// issue 56730
+	{"2006-01-02", "22-10-25", `parsing time "22-10-25" as "2006-01-02": cannot parse "22-10-25" as "2006"`},
+	{"06-01-02", "a2-10-25", `parsing time "a2-10-25" as "06-01-02": cannot parse "a2-10-25" as "06"`},
+	{"03:04PM", "12:03pM", `parsing time "12:03pM" as "03:04PM": cannot parse "pM" as "PM"`},
+	{"03:04pm", "12:03pM", `parsing time "12:03pM" as "03:04pm": cannot parse "pM" as "pm"`},
+}
+
+func TestParseErrors(t *testing.T) {
+	for _, test := range parseErrorTests {
+		_, err := Parse(test.format, test.value)
+		if err == nil {
+			t.Errorf("expected error for %q %q", test.format, test.value)
+		} else if !strings.Contains(err.Error(), test.expect) {
+			t.Errorf("expected error with %q for %q %q; got %s", test.expect, test.format, test.value, err)
+		}
+	}
+}
+
+func TestNoonIs12PM(t *testing.T) {
+	noon := Date(0, January, 1, 12, 0, 0, 0, UTC)
+	const expect = "12:00PM"
+	got := noon.Format("3:04PM")
+	if got != expect {
+		t.Errorf("got %q; expect %q", got, expect)
+	}
+	got = noon.Format("03:04PM")
+	if got != expect {
+		t.Errorf("got %q; expect %q", got, expect)
+	}
+}
+
+func TestMidnightIs12AM(t *testing.T) {
+	midnight := Date(0, January, 1, 0, 0, 0, 0, UTC)
+	expect := "12:00AM"
+	got := midnight.Format("3:04PM")
+	if got != expect {
+		t.Errorf("got %q; expect %q", got, expect)
+	}
+	got = midnight.Format("03:04PM")
+	if got != expect {
+		t.Errorf("got %q; expect %q", got, expect)
+	}
+}
+
+func Test12PMIsNoon(t *testing.T) {
+	noon, err := Parse("3:04PM", "12:00PM")
+	if err != nil {
+		t.Fatal("error parsing date:", err)
+	}
+	if noon.Hour() != 12 {
+		t.Errorf("got %d; expect 12", noon.Hour())
+	}
+	noon, err = Parse("03:04PM", "12:00PM")
+	if err != nil {
+		t.Fatal("error parsing date:", err)
+	}
+	if noon.Hour() != 12 {
+		t.Errorf("got %d; expect 12", noon.Hour())
+	}
+}
+
+func Test12AMIsMidnight(t *testing.T) {
+	midnight, err := Parse("3:04PM", "12:00AM")
+	if err != nil {
+		t.Fatal("error parsing date:", err)
+	}
+	if midnight.Hour() != 0 {
+		t.Errorf("got %d; expect 0", midnight.Hour())
+	}
+	midnight, err = Parse("03:04PM", "12:00AM")
+	if err != nil {
+		t.Fatal("error parsing date:", err)
+	}
+	if midnight.Hour() != 0 {
+		t.Errorf("got %d; expect 0", midnight.Hour())
+	}
+}
+
+// Check that a time without a Zone still produces a (numeric) time zone
+// when formatted with MST as a requested zone.
+func TestMissingZone(t *testing.T) {
+	time, err := Parse(RubyDate, "Thu Feb 02 16:10:03 -0500 2006")
+	if err != nil {
+		t.Fatal("error parsing date:", err)
+	}
+	expect := "Thu Feb  2 16:10:03 -0500 2006" // -0500 not EST
+	str := time.Format(UnixDate)               // uses MST as its time zone
+	if str != expect {
+		t.Errorf("got %s; expect %s", str, expect)
+	}
+}
+
+func TestMinutesInTimeZone(t *testing.T) {
+	time, err := Parse(RubyDate, "Mon Jan 02 15:04:05 +0123 2006")
+	if err != nil {
+		t.Fatal("error parsing date:", err)
+	}
+	expected := (1*60 + 23) * 60
+	_, offset := time.Zone()
+	if offset != expected {
+		t.Errorf("ZoneOffset = %d, want %d", offset, expected)
+	}
+}
+
+type SecondsTimeZoneOffsetTest struct {
+	format         string
+	value          string
+	expectedoffset int
+}
+
+var secondsTimeZoneOffsetTests = []SecondsTimeZoneOffsetTest{
+	{"2006-01-02T15:04:05-070000", "1871-01-01T05:33:02-003408", -(34*60 + 8)},
+	{"2006-01-02T15:04:05-07:00:00", "1871-01-01T05:33:02-00:34:08", -(34*60 + 8)},
+	{"2006-01-02T15:04:05-070000", "1871-01-01T05:33:02+003408", 34*60 + 8},
+	{"2006-01-02T15:04:05-07:00:00", "1871-01-01T05:33:02+00:34:08", 34*60 + 8},
+	{"2006-01-02T15:04:05Z070000", "1871-01-01T05:33:02-003408", -(34*60 + 8)},
+	{"2006-01-02T15:04:05Z07:00:00", "1871-01-01T05:33:02+00:34:08", 34*60 + 8},
+	{"2006-01-02T15:04:05-07", "1871-01-01T05:33:02+01", 1 * 60 * 60},
+	{"2006-01-02T15:04:05-07", "1871-01-01T05:33:02-02", -2 * 60 * 60},
+	{"2006-01-02T15:04:05Z07", "1871-01-01T05:33:02-02", -2 * 60 * 60},
+}
+
+func TestParseSecondsInTimeZone(t *testing.T) {
+	// should accept timezone offsets with seconds like: Zone America/New_York   -4:56:02 -      LMT     1883 Nov 18 12:03:58
+	for _, test := range secondsTimeZoneOffsetTests {
+		time, err := Parse(test.format, test.value)
+		if err != nil {
+			t.Fatal("error parsing date:", err)
+		}
+		_, offset := time.Zone()
+		if offset != test.expectedoffset {
+			t.Errorf("ZoneOffset = %d, want %d", offset, test.expectedoffset)
+		}
+	}
+}
+
+func TestFormatSecondsInTimeZone(t *testing.T) {
+	for _, test := range secondsTimeZoneOffsetTests {
+		d := Date(1871, 1, 1, 5, 33, 2, 0, FixedZone("LMT", test.expectedoffset))
+		timestr := d.Format(test.format)
+		if timestr != test.value {
+			t.Errorf("Format = %s, want %s", timestr, test.value)
+		}
+	}
+}
+
+// Issue 11334.
+func TestUnderscoreTwoThousand(t *testing.T) {
+	format := "15:04_20060102"
+	input := "14:38_20150618"
+	time, err := Parse(format, input)
+	if err != nil {
+		t.Error(err)
+	}
+	if y, m, d := time.Date(); y != 2015 || m != 6 || d != 18 {
+		t.Errorf("Incorrect y/m/d, got %d/%d/%d", y, m, d)
+	}
+	if h := time.Hour(); h != 14 {
+		t.Errorf("Incorrect hour, got %d", h)
+	}
+	if m := time.Minute(); m != 38 {
+		t.Errorf("Incorrect minute, got %d", m)
+	}
+}
+
+// Issue 29918, 29916
+func TestStd0xParseError(t *testing.T) {
+	tests := []struct {
+		format, value, valueElemPrefix string
+	}{
+		{"01 MST", "0 MST", "0"},
+		{"01 MST", "1 MST", "1"},
+		{RFC850, "Thursday, 04-Feb-1 21:00:57 PST", "1"},
+	}
+	for _, tt := range tests {
+		_, err := Parse(tt.format, tt.value)
+		if err == nil {
+			t.Errorf("Parse(%q, %q) did not fail as expected", tt.format, tt.value)
+		} else if perr, ok := err.(*ParseError); !ok {
+			t.Errorf("Parse(%q, %q) returned error type %T, expected ParseError", tt.format, tt.value, perr)
+		} else if !strings.Contains(perr.Error(), "cannot parse") || !strings.HasPrefix(perr.ValueElem, tt.valueElemPrefix) {
+			t.Errorf("Parse(%q, %q) returned wrong parsing error message: %v", tt.format, tt.value, perr)
+		}
+	}
+}
+
+var monthOutOfRangeTests = []struct {
+	value string
+	ok    bool
+}{
+	{"00-01", false},
+	{"13-01", false},
+	{"01-01", true},
+}
+
+func TestParseMonthOutOfRange(t *testing.T) {
+	for _, test := range monthOutOfRangeTests {
+		_, err := Parse("01-02", test.value)
+		switch {
+		case !test.ok && err != nil:
+			if !strings.Contains(err.Error(), "month out of range") {
+				t.Errorf("%q: expected 'month' error, got %v", test.value, err)
+			}
+		case test.ok && err != nil:
+			t.Errorf("%q: unexpected error: %v", test.value, err)
+		case !test.ok && err == nil:
+			t.Errorf("%q: expected 'month' error, got none", test.value)
+		}
+	}
+}
+
+// Issue 37387.
+func TestParseYday(t *testing.T) {
+	t.Parallel()
+	for i := 1; i <= 365; i++ {
+		d := fmt.Sprintf("2020-%03d", i)
+		tm, err := Parse("2006-002", d)
+		if err != nil {
+			t.Errorf("unexpected error for %s: %v", d, err)
+		} else if tm.Year() != 2020 || tm.YearDay() != i {
+			t.Errorf("got year %d yearday %d, want %d %d", tm.Year(), tm.YearDay(), 2020, i)
+		}
+	}
+}
+
+// Issue 45391.
+func TestQuote(t *testing.T) {
+	tests := []struct {
+		s, want string
+	}{
+		{`"`, `"\""`},
+		{`abc"xyz"`, `"abc\"xyz\""`},
+		{"", `""`},
+		{"abc", `"abc"`},
+		{`☺`, `"\xe2\x98\xba"`},
+		{`☺ hello ☺ hello`, `"\xe2\x98\xba hello \xe2\x98\xba hello"`},
+		{"\x04", `"\x04"`},
+	}
+	for _, tt := range tests {
+		if q := Quote(tt.s); q != tt.want {
+			t.Errorf("Quote(%q) = got %q, want %q", tt.s, q, tt.want)
+		}
+	}
+
+}
+
+// Issue 48037
+func TestFormatFractionalSecondSeparators(t *testing.T) {
+	tests := []struct {
+		s, want string
+	}{
+		{`15:04:05.000`, `21:00:57.012`},
+		{`15:04:05.999`, `21:00:57.012`},
+		{`15:04:05,000`, `21:00:57,012`},
+		{`15:04:05,999`, `21:00:57,012`},
+	}
+
+	// The numeric time represents Thu Feb  4 21:00:57.012345600 PST 2009
+	time := Unix(0, 1233810057012345600)
+	for _, tt := range tests {
+		if q := time.Format(tt.s); q != tt.want {
+			t.Errorf("Format(%q) = got %q, want %q", tt.s, q, tt.want)
+		}
+	}
+}
+
+var longFractionalDigitsTests = []struct {
+	value string
+	want  int
+}{
+	// 9 digits
+	{"2021-09-29T16:04:33.000000000Z", 0},
+	{"2021-09-29T16:04:33.000000001Z", 1},
+	{"2021-09-29T16:04:33.100000000Z", 100_000_000},
+	{"2021-09-29T16:04:33.100000001Z", 100_000_001},
+	{"2021-09-29T16:04:33.999999999Z", 999_999_999},
+	{"2021-09-29T16:04:33.012345678Z", 12_345_678},
+	// 10 digits, truncates
+	{"2021-09-29T16:04:33.0000000000Z", 0},
+	{"2021-09-29T16:04:33.0000000001Z", 0},
+	{"2021-09-29T16:04:33.1000000000Z", 100_000_000},
+	{"2021-09-29T16:04:33.1000000009Z", 100_000_000},
+	{"2021-09-29T16:04:33.9999999999Z", 999_999_999},
+	{"2021-09-29T16:04:33.0123456789Z", 12_345_678},
+	// 11 digits, truncates
+	{"2021-09-29T16:04:33.10000000000Z", 100_000_000},
+	{"2021-09-29T16:04:33.00123456789Z", 1_234_567},
+	// 12 digits, truncates
+	{"2021-09-29T16:04:33.000123456789Z", 123_456},
+	// 15 digits, truncates
+	{"2021-09-29T16:04:33.9999999999999999Z", 999_999_999},
+}
+
+// Issue 48685 and 54567.
+func TestParseFractionalSecondsLongerThanNineDigits(t *testing.T) {
+	for _, tt := range longFractionalDigitsTests {
+		for _, format := range []string{RFC3339, RFC3339Nano} {
+			tm, err := Parse(format, tt.value)
+			if err != nil {
+				t.Errorf("Parse(%q, %q) error: %v", format, tt.value, err)
+				continue
+			}
+			if got := tm.Nanosecond(); got != tt.want {
+				t.Errorf("Parse(%q, %q) = got %d, want %d", format, tt.value, got, tt.want)
+			}
+		}
+	}
+}
+
+func FuzzFormatRFC3339(f *testing.F) {
+	for _, ts := range [][2]int64{
+		{math.MinInt64, math.MinInt64}, // 292277026304-08-26T15:42:51Z
+		{-62167219200, 0},              // 0000-01-01T00:00:00Z
+		{1661201140, 676836973},        // 2022-08-22T20:45:40.676836973Z
+		{253402300799, 999999999},      // 9999-12-31T23:59:59.999999999Z
+		{math.MaxInt64, math.MaxInt64}, // -292277022365-05-08T08:17:07Z
+	} {
+		f.Add(ts[0], ts[1], true, false, 0)
+		f.Add(ts[0], ts[1], false, true, 0)
+		for _, offset := range []int{0, 60, 60 * 60, 99*60*60 + 99*60, 123456789} {
+			f.Add(ts[0], ts[1], false, false, -offset)
+			f.Add(ts[0], ts[1], false, false, +offset)
+		}
+	}
+
+	f.Fuzz(func(t *testing.T, sec, nsec int64, useUTC, useLocal bool, tzOffset int) {
+		var loc *Location
+		switch {
+		case useUTC:
+			loc = UTC
+		case useLocal:
+			loc = Local
+		default:
+			loc = FixedZone("", tzOffset)
+		}
+		ts := Unix(sec, nsec).In(loc)
+
+		got := AppendFormatRFC3339(ts, nil, false)
+		want := AppendFormatAny(ts, nil, RFC3339)
+		if !bytes.Equal(got, want) {
+			t.Errorf("Format(%s, RFC3339) mismatch:\n\tgot:  %s\n\twant: %s", ts, got, want)
+		}
+
+		gotNanos := AppendFormatRFC3339(ts, nil, true)
+		wantNanos := AppendFormatAny(ts, nil, RFC3339Nano)
+		if !bytes.Equal(got, want) {
+			t.Errorf("Format(%s, RFC3339Nano) mismatch:\n\tgot:  %s\n\twant: %s", ts, gotNanos, wantNanos)
+		}
+	})
+}
+
+func FuzzParseRFC3339(f *testing.F) {
+	for _, tt := range formatTests {
+		f.Add(tt.result)
+	}
+	for _, tt := range parseTests {
+		f.Add(tt.value)
+	}
+	for _, tt := range parseErrorTests {
+		f.Add(tt.value)
+	}
+	for _, tt := range longFractionalDigitsTests {
+		f.Add(tt.value)
+	}
+
+	f.Fuzz(func(t *testing.T, s string) {
+		// equalTime is like time.Time.Equal, but also compares the time zone.
+		equalTime := func(t1, t2 Time) bool {
+			name1, offset1 := t1.Zone()
+			name2, offset2 := t2.Zone()
+			return t1.Equal(t2) && name1 == name2 && offset1 == offset2
+		}
+
+		for _, tz := range []*Location{UTC, Local} {
+			// Parsing as RFC3339 or RFC3339Nano should be identical.
+			t1, err1 := ParseAny(RFC3339, s, UTC, tz)
+			t2, err2 := ParseAny(RFC3339Nano, s, UTC, tz)
+			switch {
+			case (err1 == nil) != (err2 == nil):
+				t.Fatalf("ParseAny(%q) error mismatch:\n\tgot:  %v\n\twant: %v", s, err1, err2)
+			case !equalTime(t1, t2):
+				t.Fatalf("ParseAny(%q) value mismatch:\n\tgot:  %v\n\twant: %v", s, t1, t2)
+			}
+
+			// TODO(https://go.dev/issue/54580):
+			// Remove these checks after ParseAny rejects all invalid RFC 3339.
+			if err1 == nil {
+				num2 := func(s string) byte { return 10*(s[0]-'0') + (s[1] - '0') }
+				switch {
+				case len(s) > 12 && s[12] == ':':
+					t.Skipf("ParseAny(%q) incorrectly allows single-digit hour fields", s)
+				case len(s) > 19 && s[19] == ',':
+					t.Skipf("ParseAny(%q) incorrectly allows comma as sub-second separator", s)
+				case !strings.HasSuffix(s, "Z") && len(s) > 4 && (num2(s[len(s)-5:]) >= 24 || num2(s[len(s)-2:]) >= 60):
+					t.Skipf("ParseAny(%q) incorrectly allows out-of-range zone offset", s)
+				}
+			}
+
+			// Customized parser should be identical to general parser.
+			switch got, ok := ParseRFC3339(s, tz); {
+			case ok != (err1 == nil):
+				t.Fatalf("ParseRFC3339(%q) error mismatch:\n\tgot:  %v\n\twant: %v", s, ok, err1 == nil)
+			case !equalTime(got, t1):
+				t.Fatalf("ParseRFC3339(%q) value mismatch:\n\tgot:  %v\n\twant: %v", s, got, t2)
+			}
+		}
+	})
+}