| @node ctime |
| @section @code{ctime} |
| @findex ctime |
| |
| POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/ctime.html} |
| |
| Gnulib module: ctime |
| |
| Portability problems fixed by Gnulib: |
| @itemize |
| @item |
| On native Windows platforms (mingw, MSVC), this function works incorrectly |
| when the environment variable @code{TZ} has been set by Cygwin. |
| @end itemize |
| |
| Portability problems not fixed by Gnulib: |
| @itemize |
| @item |
| This function may overflow its internal buffer if an invalid year is passed. |
| @item |
| The @code{ctime} function need not be reentrant, and consequently is |
| not required to be thread safe. Implementations of @code{ctime} |
| typically write the timestamp into static buffer. If two threads |
| call @code{ctime} at roughly the same time, you might end up with the |
| wrong date in one of the threads, or some undefined string. There is |
| a re-entrant interface @code{ctime_r}. |
| @item |
| Native Windows platforms (mingw, MSVC) support only a subset of time |
| zones supported by GNU or specified by POSIX. @xref{tzset}. |
| @end itemize |
| |
| A more flexible function is @code{strftime}. However, note that it is |
| locale dependent. |
