Returns TRUE if the day-month-year triplet forms a valid, existing day in the range of days glib.Date understands (Year 1 or later, no more than a few thousand years in the future).
day
month
year
TRUE if the date is a valid one
Returns TRUE if the day-month-year triplet forms a valid, existing day in the range of days glib.Date understands (Year 1 or later, no more than a few thousand years in the future).