The most reliable source for out-of-print Indian almanacs is the Digital Library of India mirrored on Archive.org.
Authored by the renowned astrologer Pambu Sivagnana Nayanar (also known as Pambu Siva. Gnana. Desigar), this Panchangam originates from Tamil Nadu. It is distinct because: pambu panchangam 2003 pdf link
A: No mainstream app goes back to 2003. You must rely on the PDF. However, apps like "Pambu Panchangam 2025" have a "History" mode that sometimes allows you to query 2003 data server-side. The most reliable source for out-of-print Indian almanacs