FM 3-02 Chapter 3 · Time and dates
Date difference
Years, months and days between two dates, totals, and Danish working days without holidays.
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Dates are plain calendar dates and times are wall-clock times with no time zone, so every day has 24 hours. Months are counted so that start plus the result gives the end: 31 Jan to 28 Feb is 1 month. Public holidays are those in Danish law. Store Bededag counts up to 2023, it was abolished from 2024. Grundlovsdag, juleaften and nytårsaften are not public holidays, but many workplaces close, so they are optional.