Rumi calendar

"As a result," says the Astronomical Almanac, "the cycle of twelve lunar months regresses through the seasons over a period of about 33 [solar] years".

[2] In 1740 (1152 AH) during the reign of Sultan Mahmud I, March was adopted as the first month of the fiscal year for the payment of taxes and dealings with government officials instead of Muharram following Treasurer Atıf Efendi's proposal.

[2] Proposed by Treasurer Moralı Osman Efendi during the reign of Sultan Abdul Hamid I, the range of the fiscal calendar applications was extended in 1794 to state expenditures and payments in order to prevent surplus cost arising from the time difference between the Islamic and Julian calendar.

[5] The Rumi calendar remained in use after the dissolution of the Ottoman Empire into the first years of the succeeding Republic of Turkey.

The other months' names were from the Syriac language, except for Mart, Mayıs, and Ağustos, which were derived from Latin.

1911 multilingual Ottoman calendar page:
  • The upper left shows the Rumi date in Ottoman Turkish : year 1327, 7 Nisan ( ٧ نیسان ١٣٢٧ )
  • The same Julian date (7 April, ΑΠΡΙΛΙΟΣ 7 ) and day (Thursday, Πέμπτη ) appears below in Greek with the AD year 1911
  • Next to that is the Gregorian date (20 April, AVRIL 20 ) and day ( Jeudi ) in French
  • Above these two is 30 (twice), the number of days in the Julian and Gregorian months; the month (April, Априлий ) and day (Thursday, Четвъртъкъ ) in Bulgarian
  • Under the Greek is Armenian , reading April ( ԱՊՐԻԼ ) and Thursday ( ՀԻՆԳՇԱԲԹԻ )
  • The upper right shows the Islamic date 21 Rebiülahir 1329 ( ٢١ ربيع الآخر ١٣٢٩ )
  • The Hebrew date 22 Nisan 5671 ( 22 ניסן 5671 ) appears at the bottom.