Work out actual working days between two dates — weekdays with Norwegian public holidays, including the movable Easter, subtracted.
The calculator goes through each day in the period and counts it as a working day if it isn't a Saturday or Sunday. It then subtracts one day for each public holiday that falls on one of those working days:
Most Norwegian public holidays have fixed dates, but several of them — Maundy Thursday, Good Friday, Easter Monday, Ascension Day and Whit Monday — are calculated from Easter Sunday, which is a movable holiday. Easter follows the lunar calendar: Easter Sunday is always the first Sunday after the first full moon on or after the spring equinox, so it can fall anywhere between late March and late April. The calculator uses a standard astronomical formula (the Meeus/Jones/Butcher algorithm) to find the date for a given year.
The holidays included are: January 1 (New Year's Day), Maundy Thursday, Good Friday, Easter Monday, May 1 (Labour Day), May 17 (Constitution Day), Ascension Day, Whit Monday, December 25 (Christmas Day) and December 26 (Boxing Day). Easter Sunday and Whit Sunday always fall on a Sunday, so they don't need to be counted separately since Sundays are already outside the working days.
New Year's Day, Maundy Thursday, Good Friday, Easter Monday, Labour Day (May 1), Constitution Day (May 17), Ascension Day, Whit Monday, and Christmas Day/Boxing Day (Dec 25–26). Holidays that always fall on a Sunday (Easter Sunday and Whit Sunday) aren't counted separately, since Sundays are already excluded as weekend.
Easter is tied to the phases of the moon, not a fixed calendar date. Easter Sunday is the first Sunday after the first full moon on or after the spring equinox, which means Easter can fall anywhere between late March and late April from year to year.
No. Christmas Eve (December 24) and New Year's Eve (December 31) are not official public holidays in Norway, even though many companies give employees time off or reduced hours on these days as a workplace policy. Check with your employer for such local arrangements.