Defined in header
Returns the current calendar time encoded as a std::time_t object, and also stores it in the object pointed to by
arg is a null pointer.
|arg||-||pointer to a std::time_t object to store the time, or a null pointer|
 Return value
The encoding of calendar time in std::time_t is unspecified, but most systems conform to the POSIX specification and return a value of integral type holding 86400 times the number of calendar days since the Epoch plus the number of seconds that have passed since the last midnight UTC. Most notably, POSIX time does not (and can not) take leap seconds into account, so that this integral value is not equal to the number of S.I. seconds that have passed since the epoch, but rather is reduced with the number of leap seconds that have occurred since the epoch. Implementations in which std::time_t is a 32-bit signed integer (many historical implementations) fail in the year 2038.
Wed Sep 21 10:27:52 2011 1316615272 seconds since the Epoch
 See also
| returns the calendar time in seconds and nanoseconds based on a given time base |
| converts time since epoch to calendar time expressed as local time |
| converts time since epoch to calendar time expressed as Universal Coordinated Time |
| wall clock time from the system-wide realtime clock |
C documentation for time