Just to be clear, we’re not changing anything, all we will do is to make Agenda adhere to the system wide setting. To ensure that if your system shows Sunday as the first day of the week it will do as well in Agenda, while if you have set it to Monday it will show it as such. This is a setting you can set in the System Settings under the international tab (where you also set which currency you prefer, whether to use commas or periods as thousands separator etc etc.
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”Daylight saving time” is a wonderful invention. I just wish we could have it all year round.
(not that there is much daylight to save during winter, when the sun is up only 3-4 hours)
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Oh thank you! I had already set weeks to start on Monday in BusyCal (and iCal), but Agenda desktop app was showing weeks starting on Sundays. (I was happily surprised Agenda iOS showed weeks starting Monday and hoped it would stay that way.)
However, I did not realize this was in system-wide in settings. I did this and set weeks to start Monday, then closed and reopened Agenda desktop – and voila, now weeks start Monday. I’m delighted. Thanks! Screenshots help so much!
I think I got it set on the iPhone also 
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I have the system preference set to have the week start on Monday. This works on my Mac. But Agenda still shows the week starting on Sunday on my iOS devices. Can you offer some help?
Or is this what you meant by you’re rewriting calendar control for iOS and it will be introduced soon? If so, then fine. Thanks.
Keep up the great work.
The calendar should pick up your locale and base the first day on that locale from settings. On my iPhone, the weeks are starting on Monday, because I am in The Netherlands. US phones will start on Sunday.
Also, just to be sure, are you using sure you are using the latest version of Agenda for iOS (2.1.2)?
I am running 2.1.2. Notes and stuff are syncing properly.
The (built in) iPhone calendar app has the week starting on Monday.
The Agenda app calendar still has weeks starting on Sunday.
What is the region setting on both devices? Like Drew I just checked and it works for me.
I just checked both devices again. The setting is the US on both devices, which is where I live. The time zone is also correct (Cupertino).
Thanks for taking the time to look into this. Would email be better for you?
OK. I am now see that the built in calendar app shows the week starting on Monday on my Mac and on my iPhone but shows the week starting on Sunday on my iPad. I’m not sure how that is happening or whether that has anything to do with this.
Strange, but indeed this sounds more like a bug or setting in calendar. The iPad follows the system locale but the Mac has its own setting in the calendar app actually:
Perhaps that’s it?
Yes. It was configured correctly on the iPhone but showed the week starting on Sunday on the iPad. I fixed that on the iPad, but Agenda still shows the week beginning on Sunday on my “iDevices.” I’ll keep fiddling. 
After a (very very Very!) quick read of this thread, I’m unsure if my download didn’t fall victim to a small bug, since the calendaring function should (normally?) adhere to my system’s date format…
Thank you!
I, too, live in the US and cannot get my iPhone and iPad to use Monday for the start of the week. I don’t see a setting in Agenda; does anyone know how to change this?
Agenda should follow the local and date/calendar settings in the System Preferences (macOS) and Settings app (iOS). After changing the settings, it might be necessary to force quit the iOS app.
Not sure what I am doing wrong, but this does not work for me. Attaching a screenshot of my calendar setting.
It turns out what you show is the Calendar.app preferences, which allows you to override the default for the region. The default first day of the week is sunday for the US, which is what Agenda is using. In the Netherlands the default is monday and therefore Agenda shows the calendar starting on monday. I’m afraid the settings you show are private to the Calendar app and not available to us.
Would you be willing to consider making this a setting in agenda that we can adjust? I would like to have my calendar set to begin on Monday, but don’t want to change the region setting for my device away from the US.
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