timegm.c File Reference

For systems lacking timegm() More...

#include "config.h"
#include <stdbool.h>
#include <time.h>

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Functions
static bool	is_leap_year (int year)
	Is this a Leap Year?
static time_t	tm_to_sec (struct tm *tm)
	Convert a time structure to number of seconds since the epoch.
time_t	timegm (struct tm *tm)
	Convert struct tm to time_t seconds since epoch.

Detailed Description

For systems lacking timegm()

Authors

• Claes Nästén

Copyright

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 2 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/.

Definition in file timegm.c.

Function Documentation

is_leap_year()

static bool is_leap_year ( int  year )

static

Is this a Leap Year?

Parameters

year

Year

Return values

true	It's a leap year

Definition at line 38 of file timegm.c.

{
  return ((year % 400) == 0) || ((year % 4) == 0) && ((year % 100) != 0);
}

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tm_to_sec()

static time_t tm_to_sec ( struct tm *  tm )

static

Convert a time structure to number of seconds since the epoch.

Parameters

tm	Time structure

Return values

num	Seconds since the epoch

Definition at line 48 of file timegm.c.

{
  time_t val = tm->tm_sec + (tm->tm_min * 60) + (tm->tm_hour * 3600) + (tm->tm_yday * 86400);
 
  int year = 1900 + tm->tm_year;
  for (int i = 1970; i < year; i++)
  {
    if (is_leap_year(i))
      val += (366 * 86400);
    else
      val += (365 * 86400);
  }
 
  return val;
}

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timegm()

time_t timegm

(

struct tm *

tm

)

Convert struct tm to time_t seconds since epoch.

Parameters

tm	Time to convert to seconds since epoch

Return values

num	Seconds since epoch

Definition at line 69 of file timegm.c.

{
  return tm_to_sec(tm);
}

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