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# localtime

From cppreference.com
< c‎ | chrono

Defined in header `<time.h>` |  |
tm* localtime( const time_t *time ); |  |

Converts given time since epoch as time_t value into calendar time, expressed in local time.

### [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 be 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>
    #include <stdlib.h>

    int main(void)
    {
        time_t t = time(NULL);
        printf("UTC:   %s", asctime(gmtime(&t)));
        struct tm *tmptr = localtime(&t);
        if (tmptr == NULL)
        {
           fprintf(stderr,"localtime() failed in file %s at line # %d\n", __FILE__,__LINE__-3);
           exit(EXIT_FAILURE);
        }
        printf("local: %s", asctime(tmptr));

        return EXIT_SUCCESS;
    }

Output:

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

### [edit] See also

gmtime | converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC) (function) [edit]
C++ documentation for localtime

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