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std::localtime(3) C++ Standard Libary std::localtime(3) NAME std::localtime - std::localtime Synopsis Defined in header <ctime> std::tm* localtime( const std::time_t *time ); Converts given time since epoch as std::time_t value into calendar time, expressed in local time. Parameters time - pointer to a std::time_t object to convert Return value pointer to a static internal std::tm object on success, or null pointer otherwise. The structure may be shared between std::gmtime, std::localtime, and std::ctime, and may be overwritten on each invocation. Notes This function may not be thread-safe. POSIX requires that this function sets errno to EOVERFLOW if it fails because the argument is too large. POSIX specifies that the timezone information is determined by this function as if by calling tzset, which reads the environment variable TZ. Example // Run this code #include <iostream> #include <sstream> #include <iomanip> #include <ctime> int main() { setenv("TZ", "/usr/share/zoneinfo/America/Los_Angeles", 1); // POSIX-specific std::tm tm{}; // zero initialise tm.tm_year = 2020-1900; // 2020 tm.tm_mon = 2-1; // February tm.tm_mday = 15; // 15th tm.tm_hour = 10; tm.tm_min = 15; tm.tm_isdst = 0; // Not daylight saving std::time_t t = std::mktime(&tm); std::cout << "UTC: " << std::put_time(std::gmtime(&t), "%c %Z") << '\n'; std::cout << "local: " << std::put_time(std::localtime(&t), "%c %Z") << '\n'; } Possible output: UTC: Sat Feb 15 18:15:00 2020 GMT local: Sat Feb 15 10:15:00 2020 PST See also converts time since epoch to calendar time expressed as Universal gmtime Coordinated Time (function) localtime localtime_r converts time since epoch to calendar time expressed as local time localtime_s (function) (C23) (C11) http://cppreference.com 2022.07.31 std::localtime(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Possible output: | See also
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