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Sources

Maratha

jeDhe shAkAvalI here.
- English dates in the shAkAvalI are Julian
Uday S Kulkarni book
- “@MulaMutha actually does mention that all dates used in the book pre 1752 are given as is in “Old Style”. (No conversion applied)
Shivaji and his times by jadunath sarkar here
English records
- Adapted Gregorian in 1752
Dutch East India company
- Adapted Gregorian in about 1600 as per Bellarikar
Portuguese
- The new Gregorian Calendar came into vogue in Bassein Goa and other territories under Portuguese domination since October, 1583. But in the territories under the British, the old Julian Calendar held the field till 1752. That leads to difference of ten days before February 1700 and eleven days thereafter.
New History Of The Marathas Vol.1 here
New History Of The Marathas Vol.2 here
- Uses Julian date for Feb 8 1736 - siddi destruction of parashurAma temple in chiplun on shivarAtri.
Marathas and Panipat here

Madras

Records

There is a chance that the original letter from the collector and maybe the kararnamas may be in the Madras government archives. That shouldn’t be hard to trace as we know the district where the collector was placed.

Indexes

TW - start year is 1857.
In person access Readers can scrutinise records dating from the 17th C. They would be brittle so most will not be digitised.

Light can damage old paper is their excuse for not allowing phone photos. And the records cannot be accessed by all. One needs to carry letters from the university or be a bona fide scholar to access them. They will not even allow you the readers pass otherwise. Too many gatekeepers in indian archives.