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Adjustments before Hillel II, and before 7-900?

info 2 weeks ago updated by Michael J. Radwin 2 weeks ago 1

This is awesome! However, I was wondering: Does this calculator make adjustments for years before Hillel II when the calendar was different, and/or before the change in the years which used to track time since the Exodus rather than from Creation?

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Thanks for using Hebcal. In short, no, you should not look to Hebcal to give precise calculations for dates before 1752 CE. Hebcal uses the proleptic Gregorian calendar and does not attempt to compensate for dates that differ prior to the Gregorian reformation.

https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar#:~:text=The%20proleptic%20Gregorian%20calendar%20is,its%20official%20introduction%20in%201582.

Answer
Answered

Thanks for using Hebcal. In short, no, you should not look to Hebcal to give precise calculations for dates before 1752 CE. Hebcal uses the proleptic Gregorian calendar and does not attempt to compensate for dates that differ prior to the Gregorian reformation.

https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar#:~:text=The%20proleptic%20Gregorian%20calendar%20is,its%20official%20introduction%20in%201582.