Converts this date to the Epoch Day.
!(p)
The {@link ChronoField#EPOCH_DAY Epoch Day count} is a simple
incrementing count of days where day 0 is 1970-01-01 (ISO).
This definition is the same for all chronologies, enabling conversion.
!(p)
This implementation queries the {@code EPOCH_DAY} field.
Converts this date to the Epoch Day. !(p) The {@link ChronoField#EPOCH_DAY Epoch Day count} is a simple incrementing count of days where day 0 is 1970-01-01 (ISO). This definition is the same for all chronologies, enabling conversion. !(p) This implementation queries the {@code EPOCH_DAY} field.
@return the Epoch Day equivalent to this date