Search for "1988 Marathi Panchang PDF" rather than only "Kalnirnay," as specialized almanac websites or personal blogs are more likely to have scanned archives of that era. To help me narrow down the best source for you,

By using the archival methods listed above, you can legally obtain a copy. Once you have it, print it out, frame the vintage ads, or use it to verify that long-ago family birth date.

For modern versions and the latest app features, you can visit the official Kalnirnay website Panchang details (like Tithi or Nakshatra) for a specific date in 1988?