Returns the current time when called without arguments,
or a time representing the date and time specified by the given table.
This table must have fields
and may have fields
(for a description of these fields, see the
The returned value is a number, whose meaning depends on your system.
In POSIX, Windows, and some other systems, this number counts the number
of seconds since some given start time (the "epoch").
In other systems, the meaning is not specified,
and the number returned by
time can be used only as an argument to