Developer Builds Offline Ethiopian Calendar App in Flutter

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A developer describes building the Zemen App, an offline Flutter calendar that converts between Ethiopian and Gregorian dates and tracks national holidays and Orthodox fasting days. The core is a self-contained Dart engine that uses a Julian Day Number as a neutral pivot between the two calendars. The Ethiopian calendar's 13 months, with fixed month lengths and a leap year rule every four years, keep the conversion arithmetic simple. The engine relies only on integer math, so it behaves consistently across devices and is fast enough for calendar grids. The article walks readers through the algorithms so they can adapt the approach to other non-Gregorian calendars.

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