Surya Siddhanta
अत ऊर्ध्वम् अमी युक्ता गतकालाब्दसम्ख्यया। मासीकृता युता मासैर् मधुशुक्लादिभिर् गतैः ॥
To 1,953,720,000 the number of elapsed years, add the number of years elapsed (from the end of the last Kríta yuga to the present year;) reduce the sum to months (by multiplying it by 12;) to the result add the number of lunar months from the beginning of the light half of the Chaitra[1] (of the current year to the present lunar month.)
english translation
ata Urdhvam amI yuktA gatakAlAbdasamkhyayA। mAsIkRtA yutA mAsair madhuzuklAdibhir gataiH ॥
hk transliteration by Sanscript