Browse free open source Date Calculators and projects for Windows below. Use the toggles on the left to filter open source Date Calculators by OS, license, language, programming language, and project status.
Pefect Age Calculator Tool
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Tiny date, time diff calculator
Calculates your age in days and logs it.
Convert between calendars and work with date ranges.
Maritime calculator. ETA, Speed, Slip, Distance e.t.c.
Simple calculator that can handle dates and time.
Basic Scientific Calculator
A small calculator to leave out holidays in a period of time