Open Radar

 
Summary:
Weeks start on Mondays in Germany. However, when I print from the calendar app, the printout shows weeks starting at Tuesday. There are a multitude of threads regarding this issue on discussions.apple.com (eg https://discussions.apple.com/thread/6560780)

I set the start of week to "Monday" both in my Mac's System Preferences ("Language&Region") and in the Calendar App's setting dialog. I expect my printouts to honor these settings. 

Note that when I change either the system setting or the calendar's setting to a week start of Sunday, I am able to print off a week starting in Monday.

More interesting even, when I set both settings to a week start of Tuesday, my printout starts on Thursday!

I have included several screenshots to illustrate the problem.

https://www.dropbox.com/s/sd2qi54dmeszd5v/Mon-Mon-%3ETues.png
https://www.dropbox.com/s/buipmko2gavtmob/Mon%2BSun-%3EMon.png
https://www.dropbox.com/s/ztug9tmfd3fq725/Mon%2BTue-%3EWed.png
https://www.dropbox.com/s/yd0e5cxavrpvt1g/Tue%2BTue-%3EThur.png


Steps to Reproduce:
1. Goto System Preferences -> Language&Region and set First day of Week to "Monday"
2. In the Calendar App's preferences -- on the General tab -- set "Start week on" to "Monday"
3. In the Calendar App select "File" -> "Print"
4. In the Print Dialog, Select View: "Week" or "Month" 

Expected Results:
I expected the printout to honor the Calendar App's settings and print a week starting with MONDAY.

Actual Results:
The first day of the week in both print preview and the actual printout is TUESDAY, not Monday, as was specified.

Version:
Calendar Version 8.0 (2026)
OS X 10.10.1 (14B25)

Notes:
It seems that the calendar printout algorithm adds a correction factor of both the App setting and the system settings, thus leading to a "double compensation". 

Say: Default = Sunday = 0
System says week starts on Monday. "Oh, I must add one day", the calendar thinks.
Calendar app says week starts on Monday.  "Oh, I must add one day", the calendar thinks.

"So obviously, I have to add TWO days, and print off a week that starts on Tuesday".

Well, no ... ;)

Configuration:
The problem only occurs when the user specifies a start of week in the system(!) settings that is not Sunday.