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+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_prog_date.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_PROG_DATE()
+#
+# DESCRIPTION
+#
+# This macro tries to determine the type of the date (1) command and some
+# of its non-standard capabilities.
+#
+# The type is determined as follow:
+#
+# * If the version string contains "GNU", then:
+# - The variable ax_cv_prog_date_gnu is set to "yes".
+# - The variable ax_cv_prog_date_type is set to "gnu".
+#
+# * If date supports the "-v 1d" option, then:
+# - The variable ax_cv_prog_date_bsd is set to "yes".
+# - The variable ax_cv_prog_date_type is set to "bsd".
+#
+# * If both previous checks fail, then:
+# - The variable ax_cv_prog_date_type is set to "unknown".
+#
+# The following capabilities of GNU date are checked:
+#
+# * If date supports the --date arg option, then:
+# - The variable ax_cv_prog_date_gnu_date is set to "yes".
+#
+# * If date supports the --utc arg option, then:
+# - The variable ax_cv_prog_date_gnu_utc is set to "yes".
+#
+# The following capabilities of BSD date are checked:
+#
+# * If date supports the -v 1d option, then:
+# - The variable ax_cv_prog_date_bsd_adjust is set to "yes".
+#
+# * If date supports the -r arg option, then:
+# - The variable ax_cv_prog_date_bsd_date is set to "yes".
+#
+# All the aforementioned variables are set to "no" before a check is
+# performed.
+#
+# LICENSE
+#
+# Copyright (c) 2017 Enrico M. Crisostomo <enrico.m.crisostomo@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# As a special exception, the respective Autoconf Macro's copyright owner
+# gives unlimited permission to copy, distribute and modify the configure
+# scripts that are the output of Autoconf when processing the Macro. You
+# need not follow the terms of the GNU General Public License when using
+# or distributing such scripts, even though portions of the text of the
+# Macro appear in them. The GNU General Public License (GPL) does govern
+# all other use of the material that constitutes the Autoconf Macro.
+#
+# This special exception to the GPL applies to versions of the Autoconf
+# Macro released by the Autoconf Archive. When you make and distribute a
+# modified version of the Autoconf Macro, you may extend this special
+# exception to the GPL to apply to your modified version as well.
+
+#serial 3
+
+AC_DEFUN([AX_PROG_DATE], [dnl
+ AC_CACHE_CHECK([for GNU date], [ax_cv_prog_date_gnu], [
+ ax_cv_prog_date_gnu=no
+ if date --version 2>/dev/null | head -1 | grep -q GNU
+ then
+ ax_cv_prog_date_gnu=yes
+ fi
+ ])
+ AC_CACHE_CHECK([for BSD date], [ax_cv_prog_date_bsd], [
+ ax_cv_prog_date_bsd=no
+ if date -v 1d > /dev/null 2>&1
+ then
+ ax_cv_prog_date_bsd=yes
+ fi
+ ])
+ AC_CACHE_CHECK([for date type], [ax_cv_prog_date_type], [
+ ax_cv_prog_date_type=unknown
+ if test "x${ax_cv_prog_date_gnu}" = "xyes"
+ then
+ ax_cv_prog_date_type=gnu
+ elif test "x${ax_cv_prog_date_bsd}" = "xyes"
+ then
+ ax_cv_prog_date_type=bsd
+ fi
+ ])
+ AS_VAR_IF([ax_cv_prog_date_gnu], [yes], [
+ AC_CACHE_CHECK([whether GNU date supports --date], [ax_cv_prog_date_gnu_date], [
+ ax_cv_prog_date_gnu_date=no
+ if date --date=@1512031231 > /dev/null 2>&1
+ then
+ ax_cv_prog_date_gnu_date=yes
+ fi
+ ])
+ AC_CACHE_CHECK([whether GNU date supports --utc], [ax_cv_prog_date_gnu_utc], [
+ ax_cv_prog_date_gnu_utc=no
+ if date --utc > /dev/null 2>&1
+ then
+ ax_cv_prog_date_gnu_utc=yes
+ fi
+ ])
+ ])
+ AS_VAR_IF([ax_cv_prog_date_bsd], [yes], [
+ AC_CACHE_CHECK([whether BSD date supports -r], [ax_cv_prog_date_bsd_date], [
+ ax_cv_prog_date_bsd_date=no
+ if date -r 1512031231 > /dev/null 2>&1
+ then
+ ax_cv_prog_date_bsd_date=yes
+ fi
+ ])
+ ])
+ AS_VAR_IF([ax_cv_prog_date_bsd], [yes], [
+ AC_CACHE_CHECK([whether BSD date supports -v], [ax_cv_prog_date_bsd_adjust], [
+ ax_cv_prog_date_bsd_adjust=no
+ if date -v 1d > /dev/null 2>&1
+ then
+ ax_cv_prog_date_bsd_adjust=yes
+ fi
+ ])
+ ])
+])dnl AX_PROG_DATE