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WCSFTIME(3) Library Functions Manual WCSFTIME(3)

wcsftime
format date and time to wide characters string

#include <wchar.h>

size_t
wcsftime(wchar_t *buf, size_t maxsize, const wchar_t *format, const struct tm *timeptr);

The wcsftime() is a wide char equivalent of strftime(3).

strftime(3)
June 5, 2013 OpenBSD-current