/* Convert UTC calendar time to simple time.  Like mktime but assumes UTC.

   Copyright (C) 1994-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#ifdef _LIBC

# include <time.h>

#else

# include "timegm.h"

/* Portable standalone applications should supply a "time_r.h" that

   declares a POSIX-compliant gmtime_r, for the benefit of older

   implementations that lack gmtime_r or have a nonstandard one.

   See the gnulib time_r module for one way to implement this.  */

# include <time_r.h>

# undef __gmtime_r

# define __gmtime_r gmtime_r

time_t __mktime_internal (struct tm *,

			  struct tm * (*) (time_t const *, struct tm *),

			  time_t *);

#endif

time_t

timegm (struct tm *tmp)

{

  static time_t gmtime_offset;

  tmp->tm_isdst = 0;

  return __mktime_internal (tmp, __gmtime_r, &gmtime_offset);

}