Function
Returns the time zone offset of a specified date.
date-time-zone-offset date => time-zone-offset
<date>.
<integer>.
system
date
Returns the time zone offset of the specified date. The values of the other components of date reflect this time zone.
A positive number represents an offset ahead of GMT, in minutes, and a negative number represents an offset behind GMT. The value returned is an instance of <integer> (for example, -300 represents the offset for EST, which is 5 hours behind GMT).