مانا بترو

الوحدات والتحويل

محوّل التواريخ الهجرية والميلادية والشمسية

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

المدخلات

النتائج

يجري تحميل الحساب…

جرى هذا الحساب داخل متصفحك. لم يُرسل أي رقم أدخلته إلى أي جهة، ولم يُحفظ شيء.

كيف تُحسب

  • 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.

أين تتوقف عن الصحة

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.

أدوات ذات صلة