C/C++ - Everything about time, date
Important data types time_t Although not defined by the C standard, this is almost always an integral value holding the number of seconds (not counting leap seconds) since 00:00, Jan 1 1970 UTC, corresponding to POSIX time. Unix and POSIX systems define time_t as an integer (usually a 32-bit or 64-bit integer) or a floating-point type. Note : Time_t can only be handled in seconds, but not in milliseconds or microsec. struct tm The tm structure has the following structure. struct tm { int tm_sec; int tm_min; int tm_hour; int tm_mday; int tm_mon; int tm_year; int tm_wday; int tm_yday; int tm_isdst; }; time_t is a variable that stores seconds that have elapsed since 1970. It is often used to convert from this variable to the easy-to-use year, month, day, hour, minute, and second formats. struct timeval The time_t discussed above has only a value in seconds. Time_t cannot be used if ms (0.001sec) and us (0.000001sec) value...