Meana Petro

Unidades y conversión

Conversor de fechas jalalí, gregoriana e hijri

One date in three calendars, for the daily drilling report that is dated in one and the contractor report that is dated in another.

Datos de entrada

Resultados

Cargando el cálculo…

Este cálculo se ejecutó en tu navegador. Ningún valor que introdujiste se envió a ningún sitio, y nada se guardó.

Cómo se calcula

  • Every calendar converts through the Julian Day Number, so three calendars need three algorithms rather than six pairwise ones.
  • Jalali uses the Khayyam–Borkowski leap-break table, which is exact from 1178 to 1633 AP — not the 33-year arithmetic rule, which drifts against the astronomical year.
  • Hijri uses the tabular (Kuwaiti) algorithm.
  • The result is round-tripped back into the source calendar; a date that does not survive that is rejected rather than silently normalised.

Dónde deja de ser cierto

The Hijri result is arithmetical, and the Hijri calendar in actual use is not. Months begin on a sighting, so a printed Umm al-Qura or a national calendar will disagree with this by a day, sometimes two, and which way it disagrees is not predictable. Use it to line up a report, never to date a contract or compute a deadline.

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