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Convert time information to a string
#include <time.h>
char* asctime( const struct tm* timeptr );
char* asctime_r( const struct tm* timeptr,
char* buf );
- timeptr
- A pointer to a tm structure that contains the time
that you want to convert to a string.
- buf
- (asctime_r() only)
A buffer in which asctime_r() can store the resulting string.
This buffer must be large enough to hold at least 26 characters.
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 asctime() function places the result string in a static
buffer that's reused every time you call asctime() or
ctime().
Calling
gmtime()
or
localtime()
could also change the date in this static buffer.
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 TSF
asctime()
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
asctime_r()
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().
clock(),
ctime(),
difftime(),
gmtime(),
localtime(),
localtime_r(),
mktime(),
strftime(),
time(),
tm,
tzset()
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