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// Copyright 2018 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.
//go:build js && wasm
package time
import (
"runtime"
"syscall/js"
)
var zoneSources = []string{
"/usr/share/zoneinfo/",
"/usr/share/lib/zoneinfo/",
"/usr/lib/locale/TZ/",
runtime.GOROOT() + "/lib/time/zoneinfo.zip",
}
func initLocal() {
localLoc.name = "Local"
z := zone{}
d := js.Global().Get("Date").New()
offset := d.Call("getTimezoneOffset").Int() * -1
z.offset = offset * 60
// According to https://tc39.github.io/ecma262/#sec-timezoneestring,
// the timezone name from (new Date()).toTimeString() is an implementation-dependent
// result, and in Google Chrome, it gives the fully expanded name rather than
// the abbreviation.
// Hence, we construct the name from the offset.
z.name = "UTC"
if offset < 0 {
z.name += "-"
offset *= -1
} else {
z.name += "+"
}
z.name += itoa(offset / 60)
min := offset % 60
if min != 0 {
z.name += ":" + itoa(min)
}
localLoc.zone = []zone{z}
}
// itoa is like strconv.Itoa but only works for values of i in range [0,99].
// It panics if i is out of range.
func itoa(i int) string {
if i < 10 {
return digits[i : i+1]
}
return smallsString[i*2 : i*2+2]
}
const smallsString = "00010203040506070809" +
"10111213141516171819" +
"20212223242526272829" +
"30313233343536373839" +
"40414243444546474849" +
"50515253545556575859" +
"60616263646566676869" +
"70717273747576777879" +
"80818283848586878889" +
"90919293949596979899"
const digits = "0123456789"
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