gmtime

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< c‎ | chrono

Defined in header `<time.h>`

tm* gmtime( const time_t* time );

Converts given time since epoch as time_t value into calendar time, expressed in Coordinated Universal Time (UTC).

Contents

1 Parameters
2 Return value
3 Notes
4 Example
5 See also

[edit] Parameters

time

-

pointer to a time_t object to convert

[edit] Return value

pointer to a static internal tm object on success, or NULL otherwise. The structure may shared between gmtime, localtime, and ctime and may be overwritten on each invocation.

[edit] Notes

This function may not be thread-safe.

POSIX requires that this function sets errno to EOVERFLOW if it fails because the argument is too large.

[edit] Example

Run this code

#include <stdio.h>
#include <time.h>
 
int main()
{
    time_t t = time(NULL);
    printf("UTC:   %s", asctime(gmtime(&t)));
    printf("local: %s", asctime(localtime(&t)));
 
    return 0;
}

Output:

UTC:   Wed Oct  9 10:37:39 2013
local: Wed Oct  9 17:37:39 2013

[edit] See also


localtime	converts time since epoch to calendar time expressed as local time (function)

C++ documentation for gmtime

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