Another article. I have linked the previous article. This one from The Dreams of Tipu Sultan looks more complete.

The reforms introduced by Tipu Sultan in the prevalent Muslim calendar consisted of the following:

He reckoned the Muslim era not  from the hijrat occurring in 622 but  from the advent of Islam in 609 A.C. He chose to call this era ‘Maulud-i-Muhammad ‘ the era reckoned  from the birth of Muhammad. Actually, however, his era begins not with the birth of the Prophet but with the proclamation of prophet-hood by Muhammad. In other words, his era begins thirteen years earlier than the hijrat.

Another measure adopted  by Tipu Sultan in connection with the calendar was the adoption of the Hindu  months and the sixty-year cycle. He, however, gave new names to the various Hindu months. Similarly each year in the 60-year cycle  was given a distinct  name. In designating the  months and years, he made use of the abjad and abtath systems of evaluating every letter of the alphabet in terms of numbers. The abjad system  which follows the ancient order of the alphabet had  been quite common throughout the Muslim world for several centuries. In addition to this, however, Tipu Sultan employed another system of valuationknown as abtath in  which the order of letters is the  one that exists in the Arabic script. He also called it ‘^hisab-i-zar’

The numerical value of each letter according to the traditional Abjad system is as follows:

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And the value of the various letters according to the Abtath is:

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The names adopted for the  months according to the Abjad and Abtath systems were:

Hindu Month Abjad Abtath
Chait Ahmadi Ahmadi
Baisakh Bahari Bahari
Jeth Jafari Taqi
Asarh Darai Thamari
Sawan Hashimi Jafari
Bhadon Wasii Haidari
Asuj Zabarjadi Khusrawi
Kartik Haidari Dini
Aghan Tului Dhakiri
Pus Yusufi Rahmani
Magh Yazidi Radi
Phagun Bayasi Rabbani

Tipu Sultan also adopted the system of intercalary months.  There was, however, a little difference between his system and the traditional Hindu system. Whereas these months were added by the  Hindus towards the  end of the year, Tipu Sultan  added them in the beginning. The names given to each year in the 60 year cycle  were as follows:

  Abjad Abtath   Abjad Abtath
1 Ahad Ahad 31 Kaya Zaar
2 Ahmad Ahmad 32 Kabud Bazr
3 Ab Ab 33 Ibl Zarab
4 Aba Aba 34 Dil Sata
5 Bab Bab 35 Dal Zartab
6 Baj Tab 36 Jibal Rabtaz
7 Abad Taba 37 Zaki Sakh
8 Abaad Baj 38 Azal Sakha
9 Jah Tah 39 Jalu Daraz
10 Awj Thabit 40 Dalw Dasa
11 Haj Abad 41 Ma Sha
12 Jahd Abaad 42 Kabk Sara
13 Jihad Bar 43 Jam Sarab
14 Wajid Hajib 44 Jaam Shata
15 Yad Jar 45 Adam Zabarjad
16 Zuhd Rija 46 Wall Sihr
17 Jazwa Hur 47 Waali Sahir
18 Hai Dur 48 Kawkab Rasikh
19 Wahid Dar 49 Kawakib Shad
20 Buduh Rahat 50 Yam Hirasat
21 Tayyib Barid 51 Dawam Saz
22 Tayib Charkh 52 Hamd Shadab
23 Yuz Kharaj 53 Hamid Barish
24 Kad Taz 54 Jan Rastar
25 Hawi Khirad 55 Adan Bashtar
26 Kabad Badr Tab 56 Huma Basharat
27 Agah Dur Taj 57 Majid Sharh
28 Wahid Dadar 58 Kuhl Rushd
29 Yahi Zad 59 Jahan Sabah
30 Kai Zar 60 Mujiz Irshad

Also, it is worthwhile noting that  like the Arabic script which is written from right to left, Tipu Sultan wrote figures also in this manner. Thus he wrote 54 as 45, 132 as 231, and 1217 as 7121.

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