Ethiopian to Gregorian date converter

It understands all thirteen Ethiopian months, including the short month Pagumen and its leap-day rule. The calculation uses fixed integer calendar arithmetic, so the answer does not depend on the computer's locale, clock, time zone, or daylight-saving settings. The response includes an ISO-style date string and separate Gregorian year, month, and day fields for convenient display or automation.

Enter an Ethiopian date precisely

Provide the Ethiopian year, month, and day as integers. Months 1 through 12 always contain 30 days, while month 13 is Pagumen, the short period at the end of the year. Pagumen normally contains five days and contains a sixth day in an Ethiopian leap year. The converter requires every component because guessing an omitted year or interpreting a partial date would make the result ambiguous. It also rejects decimals, numeric strings, zero, negative values, months outside 1 through 13, and days that do not exist in the selected month. This strict input contract is useful in forms and data pipelines because an invalid source value becomes a clear error instead of silently rolling into another month. For example, year 2016, month 1, day 1 represents Ethiopian New Year and converts to its exact Gregorian calendar counterpart. Use the returned date string when you need a compact result, or use the separate numeric fields when your application stores calendar parts independently.

How the arithmetic conversion works

The calculation first maps the Ethiopian date to a fixed day count using the established Ethiopian calendar epoch. Each completed Ethiopian year contributes 365 days, the four-year leap cycle contributes its additional days, and completed months contribute 30 days each. The fixed count is then decoded with the proleptic Gregorian rules: years divisible by four are normally leap years, century years are not, and years divisible by 400 are leap years after all. Converting through one continuous day count avoids relying on platform date parsers, which generally do not accept Ethiopian calendar input and can introduce environment-specific behavior. It also makes the result deterministic for historical and future dates within the published range. No current date is consulted, and no time of day is created. The phrase UTC describes the stable, time-zone-neutral interpretation of the calendar day; it does not mean that the input is shifted through a UTC offset. The output is the corresponding Gregorian calendar day itself, calculated entirely with bounded integer arithmetic.

Use the result safely in applications

The response returns a date field formatted as year-month-day, followed by numeric year, month, and day properties. This structure works well for database imports, archival indexes, civil-record workflows, historical research notes, and integrations that need to exchange dates with systems using the Gregorian calendar. Treat the output as a calendar date rather than an instant. If a later step needs a timestamp, that step must separately choose a time, location, and time-zone policy; this converter deliberately does not invent those details. The capability uses the arithmetic Ethiopian calendar and does not attempt to interpret handwritten text, localized month names, uncertain dates, eras before year 1, or alternative scholarly chronologies. Run it in the browser for an occasional conversion, or call the API for $0.002 when validation and conversion belong in a repeatable workflow. Because the same pure solver handles the computation, a given valid input produces the same JSON result in every supported execution channel without network access or mutable state.