< c‎ | chrono

Structure holding a calendar date and time broken down into its components.


[edit] Member objects

int tm_sec
seconds after the minute – [0, 61](until C99) / [0, 60] (since C99)[note 1]
(public member object)
int tm_min
minutes after the hour – [0, 59]
(public member object)
int tm_hour
hours since midnight – [0, 23]
(public member object)
int tm_mday
day of the month – [1, 31]
(public member object)
int tm_mon
months since January – [0, 11]
(public member object)
int tm_year
years since 1900
(public member object)
int tm_wday
days since Sunday – [0, 6]
(public member object)
int tm_yday
days since January 1 – [0, 365]
(public member object)
int tm_isdst
Daylight Saving Time flag. The value is positive if DST is in effect, zero if not and negative if no information is available
(public member object)
[edit] Notes
  1. Range allows for a positive leap second. Two leap seconds in the same minute are not allowed (the C90 range 0..61 was a defect)

[edit] Example

Show the start of calendar time.

#include <stdio.h>
#include <time.h>
int main(void)
    printf("%s\n", asctime(&(struct tm){.tm_mday=1}));

Possible output:

Sun Jan  1 00:00:00 1900

[edit] See also

converts time since epoch to calendar time expressed as local time
converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC)