Date Calculation

holiday-observance

Memorial Day 2025 falls on May 26 because the holiday is observed on the last Monday of May. Congress established this fixed-date rule in the Uniform Monday Holiday Act to creat...

Guides And Explainers

Christmas is a fixed date each year on December 25, but the number of days until Christmas changes based on today’s date and how leap years shift the calendar. This evergreen...

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When asking whose birthday is tomorrow, the answer depends on whose date set you are using and how you verify it. This guide explains how to determine a date-based birthday for...

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The period from Memorial Day to Labor Day spans approximately three calendar months and represents one of the longest stretches of warm-season weekends in the United States. For...

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Days since 1/1/2000 represents the elapsed time as the difference between a target date and the Unix epoch start of year 2000 in day units. This value is useful for date arithme...