Updated: April 19, 2023 |
Convert time information to a string
#include <time.h> char* asctime( const struct tm* timeptr ); char* asctime_r( const struct tm* timeptr, char* buf );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The asctime() and asctime_r() functions convert the time information in the structure pointed to by timeptr into a string containing exactly 26 characters, in the form:
Tue May 7 10:40:27 2002\n\0
The result string for asctime_r() is contained in the buffer pointed to by buf.
All fields have a constant width. The newline character ('\n') and a NUL character ('\0') occupy the last two positions of the string.
A pointer to the character string result, or NULL if an error occurred.
asctime() is ANSI, POSIX 1003.1; asctime_r() is POSIX 1003.1 OB. These functions are marked as obsolescent, and may be removed from a future version of the standard.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | No |
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |
The asctime() and ctime() functions place their results in a static buffer that's reused for each call to asctime() or ctime().