Converts given calendar time std::tm to a textual representation of the following fixed 25-character form: Www Mmm dd hh:mm:ss yyyy\n.
Www - three-letter English abbreviated day of the week from time_ptr->tm_wday, one of Mon, Tue, Wed, Thu, Fri, Sat, Sun.Mmm - three-letter English abbreviated month name from time_ptr->tm_mon, one of Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.dd - 2-digit day of the month from timeptr->tm_mday as if printed by sprintf using %2d.hh - 2-digit hour from timeptr->tm_hour as if printed by sprintf using %.2d.mm - 2-digit minute from timeptr->tm_min as if printed by sprintf using %.2d.ss - 2-digit second from timeptr->tm_sec as if printed by sprintf using %.2d.yyyy - 4-digit year from timeptr->tm_year + 1900 as if printed by sprintf using %4d.The behavior is undefined if any member of *time_ptr is outside its normal range.
The behavior is undefined if the calendar year indicated by time_ptr->tm_year has more than 4 digits or is less than the year 1000.
The function does not support localization, and the newline character cannot be removed.
The function modifies static storage and is not thread-safe.
[edit] Parameters time_ptr - pointer to a std::tm object specifying the time to print [edit] Return valuePointer to a static null-terminated character string holding the textual representation of date and time. The string may be shared between std::asctime and std::ctime, and may be overwritten on each invocation of any of those functions.
This function returns a pointer to static data and is not thread-safe. POSIX marks this function obsolete and recommends locale-dependent std::strftime instead. In std::locale("C") the std::strftime format string "%c\n" will be an exact match to std::asctime output, while in other locales the format string "%a %b %e %H:%M:%S %Y\n" will be a potentially closer but not always exact match.
POSIX limits undefined behaviors only to the cases when the output string would be longer than 25 characters, when timeptr->tm_wday or timeptr->tm_mon are not within the expected ranges, or when timeptr->tm_year exceeds INT_MAX-1990.
Some implementations handle timeptr->tm_mday == 0 as meaning the last day of the preceding month.
[edit] ExamplePossible output:
locale C:
asctime Wed Nov 4 00:45:01 2020
strftime %c Wed Nov 4 00:45:01 2020
strftime %a %b %e %H:%M:%S %Y Wed Nov 4 00:45:01 2020
locale en_US.utf8:
asctime Wed Nov 4 00:45:01 2020
strftime %c Wed 04 Nov 2020 12:45:01 AM UTC
strftime %a %b %e %H:%M:%S %Y Wed Nov 4 00:45:01 2020
locale de_DE.utf8:
asctime Wed Nov 4 00:45:01 2020
strftime %c Mi 04 Nov 2020 00:45:01 UTC
strftime %a %b %e %H:%M:%S %Y Mi Nov 4 00:45:01 2020
locale ja_JP.utf8:
asctime Wed Nov 4 00:45:01 2020
strftime %c 2020å¹´11æ04æ¥ 00æ45å01ç§
strftime %a %b %e %H:%M:%S %Y æ°´ 11æ 4 00:45:01 2020[edit] See also
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