# RELEASETIME - problem getting JRiver to recognise it **URL:** https://community.mp3tag.de/t/releasetime-problem-getting-jriver-to-recognise-it/68369 **Category:** Support **Tags:** player **Created:** [May 1, 2025, 11:36am UTC](https://community.mp3tag.de/t/releasetime-problem-getting-jriver-to-recognise-it/68369 "2025-05-01T11:36:44Z") **Posts on this page:** 1 **Showing post:** 6
### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover) #### Post date: [May 1, 2025, 12:20pm UTC](https://community.mp3tag.de/t/releasetime-problem-getting-jriver-to-recognise-it/68369/6 "2025-05-01T12:20:30Z")
> [@Noteworthy](#): > > 23012 seems to be the number of days since January 1900. January 1900 + 23012 days = 1th January 1963 One way to get 23012 from 1.1.1963 would be to calculate 1th Januar 1963 minus 1th January 1900 = 23012 days. I'm not sure if we have a ready-made function for this calculation in Mp3tag. The calculation of the days seems not that easy: 1. **Calculate the Years** From **January 1, 1900** , to **January 1, 1963** , there are **63 years**. Each normal year has **365 days** , so: **63 × 365 = 22995 days** 2. **Account for Leap Years** Between **1900 and 1963** , there were **16 leap years** (every year divisible by 4, except 1900, which was not a leap year). Each leap year adds **one extra day** , so: **16 × 1 = 16 days** 3. **Total Number of Days** **22995 days** (regular years) + **16 days** (leap years) = **23011 days** Adding **1 day** for **January 1, 1963** , results in **23012 days**. **Formula:** ![image](https://community.mp3tag.de/uploads/default/original/3X/9/3/93e7d26257d9720d85c04b6b11e4761feb122a66.png) Calculation example with 1963: ((1963 - 1900) × 365) + ((1963 - 1900)/4) + 1 = 23012 or (63 x 365) + (63/4) + 1 = 23012 or 22995 + 16 + 1 = 23012 It gets even more complicated if you want to calculate the difference between 1.5.1963 and 1.1.1900 because you need to calculate the days in the year 1963 and check if it is a leap year. In 1963 these would lead to + 120 days. But for the 1.5.1964 it would be + 121 days because February would have 29 days... Maybe someone sees an [easier way to create a formula than this approach](https://community.mp3tag.de/t/convert-date-and-time-string-into-raw-epoch-time/59512/8)? --- _[View the full topic](https://community.mp3tag.de/t/releasetime-problem-getting-jriver-to-recognise-it/68369)._