std::ctime
<ctime>
Converts given time since epoch to a calendar local time and then to a textual representation, as if by calling std::asctime (std::localtime (time)). The resulting string has the following format:
Www Mmm dd hh:mm:ss yyyy\n
-
Www- the day of the week (one ofMon,Tue,Wed,Thu,Fri,Sat,Sun). -
Mmm- the month (one ofJan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec). -
dd- the day of the month. -
hh- hours. -
mm- minutes. -
ss- seconds. -
yyyy- years.
The function does not support localization.
Contents
[edit] Parameters
[edit] Return value
Pointer 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.
[edit] Notes
This function returns a pointer to static data and is not thread-safe. In addition, it modifies the static std::tm object which may be shared with std::gmtime and std::localtime . POSIX marks this function obsolete and recommends std::strftime instead.
The behavior may be undefined for the values of std::time_t that result in the string longer than 25 characters (e.g. year 10000).
[edit] Example
#include <cassert> #include <cstring> #include <ctime> #include <iostream> int main() { std::time_t result = std::time (nullptr); std::cout << std::ctime(&result); char buffer[32]; std::strncpy (buffer, std::ctime(&result), 26); assert ('\n' == buffer[std::strlen (buffer) - 1]); std::cout << buffer; }
Possible output:
Mon Oct 11 17:10:55 2021 Mon Oct 11 17:10:55 2021
[edit] See also
(function template) [edit]