24:00 notation for iOS
In Calendar is only a PM /AM time notation now. I prefer the 24 hours notation (International Standard ISO 8601 )
thanks
Important: this feature is already available on WEB and ANDROID.

Planned for iOS
For web: go to Settings > Account > Language and time > Time format
For Android in the sidebar go to Settings > General > Time format
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Alexa commented
HI everyone what is the feature for calendar sharing so an assistant can use to see teams calendars
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Tratz commented
Would be nice to be able to enter the time of a calendar event in 24 hour format instead of being forced to pick an option with my mouse. I.E: 1700 for 5pm, 0930 for 9:30am, etc.
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James commented
As a veteran I would find this easier than AM/PM format. Yes ISO 8601
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Reiner Klohn commented
Where exactly can you find this setting? Thanks
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Anonymous commented
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Not just time format, but also the date format in ProtonMail (ie: 2020-12-31)
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Anonymous commented
You can change the time format in account settings (at least in the beta version).
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RF commented
YES! The times are currently a complete mess
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Ed commented
+1 Was going to request this feature myself in case no one else had yet.
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acmv commented
I don't want to use settings of my region. USA resident but use 24 hour format always and European date format sometimes. Should be able to choose what formats we want to use
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acmv commented
24 hour format easier to use
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TK commented
I'm missing the the possibility to set appointment times to minutes.. I use that a lot for my work schedule. Would be great if that could be added thanks.
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Joe commented
ISO 8601 or bust
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Anonymous commented
Yes please!
ISO 8601 is the way to go. -
Anonymous commented
Please!
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Sarah L commented
As an American, I wish this were already a thing!
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Anonymous commented
Yes, non-american here.
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Will commented
Yes please!!!
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Jorge commented
Yes please! I would love to use my native date and time format.
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Guy commented
Yes!
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Anonymous commented
Please add options for ISO 8601 and 24-hour time. My regional settings are already set this way, but the flexibility of defaulting to the client's regional settings and allowing overrides to other common formats would be ideal.
This uservoice item refers to ProtonMail, but the options should be available across the Proton suite:
https://protonmail.uservoice.com/forums/284483-feedback/suggestions/7158457-option-to-change-the-format-for-email-dates-and-ti