$date->getJulianDate()

Up: class LegacyDate

Get the Julian Day number corresponding to noon at Greenwich on the date as an integer. This is a sequential number since January 1, 4713 BC in the proleptic Julian calendar as defined by Joseph Justus Scaliger (1540-1609). It is used to order dates represented by different calendars and to determine the length of time between two events.

Next: $date->isPresent()