std::gmtime (3) - Linux Manuals
Defined in header <ctime>
std::tm* gmtime( const std::time_t* time );
Converts given time since epoch as std::time_t value into calendar time, expressed in Coordinated Universal Time (UTC).
time - pointer to a time_t object to convert
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.
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.
// Run this code