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I would like to configure an alert for a recurring reminder in Reminders.app on Mountain Lion. Currently the only options I have for repeating the alert are "Every Day", "Every Week", "Every 2 Weeks", "Every Month" and "Every Year".

Repetition options

Is there a way to get more fine-grained control on the repeat schedule? For example I'd like to be reminded for something on Mon-Tue-Thu-Fri? The only way I found to accomplish that is creating 4 seperate reminders with a weekly interval, which I want to avoid.

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Do you have an iPhone 4S/5, new iPad or iPod touch with Siri? If so, Siri can do that, and then iCloud obviously syncs over to your computer. –  bassplayer7 Oct 11 '12 at 13:00
    
I actually read about how custom reminders work when speaking with Siri, but I'm not a native English speaker (Siri misunderstands me quite a lot), and I also don't fancy adding all my reminders with Siri while I'm in the office and working on my Mac. –  Gerry Oct 11 '12 at 13:02
    
I completely understand. I just tried it myself, and she didn't implement the idea, so can that idea. I think you other best bet will be to use Calendar. It does a very nice job with custom repeats like that. –  bassplayer7 Oct 11 '12 at 13:32
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4 Answers

Ask Siri to 'remind me to order prescriptions every four weeks starting on Monday 20th January'

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Fantastical allows you to do this and the price is a reasonable $20.

Fantastical event/reminder editor UI

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Fantastical is a calendar app AFAIK which is not what the question is asking about. –  patrix Jul 28 '13 at 19:38
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Fantastical doesn't only work with Calendar appointments, but allows you to create Reminder entries which I was demonstrating in my screenshot. Looks like I simply forgot to change the toggle at the top right from "Calendar" to "Reminder". –  Jen Jul 30 '13 at 3:12
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up vote 4 down vote accepted

I found out you can accomplish this with BusyCal, which has iCloud support.

Unfortunately it comes with a $49.99 pricetag, which I am hesitant to pay for the sole purpose of adding custom intervals to reminders. I also prefer not to install a 3rd application in addition to Calendar and Reminders just for managing my tasks.

That's why I did some digging and found an alternative (though very cumbersome) way to accomplish this specifically for iCloud reminders, but probably for other CalDav accounts too. You'll also need to be comfortable with editing raw iCal files.

  1. Create a reminder for your iCloud account in Reminders.app and set it to repeat weekly.
  2. Locate the local cache of your iCloud calendars in ~/Library/Calendars. You should have one or more subfolders {UUID}.caldav. If you have multiple of these folders, you'll want to have a look in the Info.plist inside to determine the correct one. Look for the key PrincipalURL which should be something like https://p01-caldav.icloud.com:443/272548408/principal/ for an iCloud account. Make note of the server name, in this case p01-caldav.icloud.com.
  3. You will have one or more {UUID}.calendar subfolders, where one of these will be a calendar specifically for reminders. You should find a .ics file for the reminders you created inside its Events subfolder, then you know you found the right calendar. Have a look at the Info.plist inside this calendar folder, and look for the value for CalendarPath.
  4. Use a WebDav client like Transmit to connect to iCloud directly. Fill out the servername from step 2, your iCloud email address and password as credentials, and specify the value for CalendarPath (step 3) as the initial path.
  5. When connected, you should see one or more {UUID}.ics files. Locate the correct one for the reminder you want to edit (UUIDs should match with the ones in the local cache) and edit the file. Look for the line RRULE:FREQ=WEEKLY and edit that one to specify a custom recurrence. For my example I put RRULE:FREQ=WEEKLY;BYDAY=MO,TU,TH,FR instead.

While Reminders.app on the Mac does not show anything different in the UI, I can see the change was effective on iOS:

enter image description here

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BusyCal has saved my sanity on many occasions. If you need pro-level calendaring, it's quite valuable and the price isn't what I remember a year down the road. It is steep for this one item, but at least you've got options and understand the CalDAV spec a bit. I bet there's an open-source CalDAV library if you like python or ruby or are looking to learn a bit of programming. –  bmike Oct 11 '12 at 15:22
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This bugs me too. It isn't possible to do in Reminders, but you can achieve the same thing by creating a repeating event in Calendar, which has a "custom..." item in the Repeat menu:

Custom Menu Item

Then you can specify exactly when to repeat the event:

Days of the Week

It seems like an oversight that Reminders doesn't have the same feature (it would be just as useful), especially since the event/reminder detail UI is the same...

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