I like seeing week numbers on my iPhone’s Calendar app, but they display in *Gregorian* form. I use the *ISO 8601* format for my work, which is slightly different, but an international standard. Yet I cannot find a setting to change this.
If I wanted a Japanese or Buddhist calendar, however, that wouldn’t be problem!
Certainly some iPhone users around the globe also need an ISO 8601 calendar for this built-in app. **Is there any way for me to get it to work on my device?**
A couple notes:
- I’m not interested in learning about other apps that do have this option. My question is about the official Apple iPhone Calendar app.
- The *macOS* has an option to change from Gregorian to ISO 8601. It seems odd to me that this option wouldn’t extend to Apple’s mobile devices too. Maybe changing it on my Mac will cause it to change on my iPhone? IDK.


Asked by EJ Mak
(863 rep)
Sep 24, 2022, 04:17 PM
Last activity: Mar 18, 2023, 12:07 PM
Last activity: Mar 18, 2023, 12:07 PM