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Gets the span between the two date-time values in years and returns the result with the remainder as a fraction, for instance 1.5 for 1 and 1/2 years.
|date1||time_t||the first date-time value|
|date2||time_t||the second date-time value|
double: Returns the span in years between the two date-time values.
// demonstrates getting the span in years between today and January 1st 2001 var span; span = date_year_span(date_create_date(2001, 1, 1), date_current_date());