_NAME_
get_seconds_since_1996_from_date

_PROTOTYPE_
secondSince1996 = get_seconds_since_1996_from_date(date)

_SHORT-DESCRIPTION_
Get the number of seconds-since-1996 from a date (in {AceTime} struct format)

_DESCRIPTION_
get_seconds_since_1996_from_date returns the seconds since 1996 corresponding
to the date given in an {AceTime} struct format.

_SHORT-CODE-SAMPLE_
date = get_date_from_day_1996(705)
secondsSince1996 = get_seconds_since_1996_from_date(date)
print, 'secondsSince1996 at the start of day1996 = 705 is ', secondsSince1996

_INPUT_
* date is the {AceTime} struct filled with the date's values.

_OUTPUT_
* The number of seconds-since-1996 (which corresponds to the values of
the spacecraft clock's time stamps on all data.)