Here is my MIH annual calender...

Aug 05, 2020,11:31 AM
 

automatically changing from April 30th to May 1st. The only date I need to adjust manually is from February 28th or 29th to March 1st.










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Perpetual/Annual

 
 By: Thomas_3 : August 5th, 2020-10:15
An annual calendar needs to have the date adjusted manually for months shorter than 31 days and the perpetual does it automatically, am I correct on that?

Yep, it's in the name

 
 By: JTCL : August 5th, 2020-10:22
Only the plain vanilla calendars have to be adjusted the way you said

An AC needs to be manually adjusted on March 1st of every year, while if I'm not mistaken a PC only on March 1st of those years that are multiples of 4 but *not* leap years...

 
 By: FabR : August 5th, 2020-10:29
The latter are precisely the multiples of 100 that are *not* also multiples of 400 (so the next four of them are: 2100, 2200, 2300, 2500). Cheers.

Better but not that good πŸ˜‰ (sorry)

 
 By: India Whiskey Charlie : August 5th, 2020-15:38
From IWC: In the early 1980s, IWC's head-watchmaker Kurt Klaus set out on an engineering journey to translate the Gregorian calendar with its many irregularities into a mechanical program for a wristwatch. His ingenious perpetual calendar, which debuted i... 

Nope. It needs adjustment on March 1, 2100

 
 By: pongster : August 5th, 2020-17:41
Just like all gregorian perpetual calendars as FabR stated above. But we wont be there to find out. There are some secular perpetual calendars that take the every 400 years thing into account. So in theory no need for adjustment. But for all mechanical wa... 

Here is my MIH annual calender...

 
 By: jporos : August 5th, 2020-11:31
automatically changing from April 30th to May 1st. The only date I need to adjust manually is from February 28th or 29th to March 1st. ...  

Difference between calendar types...

 
 By: CR : August 5th, 2020-14:11
Check this out.