Yes please, YYYY-MM-DD is the ISO standard date format. Make it switchable for the courtesy of American users.

Also 24 hours time format please. I see things like 12:37 PM. Is that 0:37 the next day??

It would be very helpful to at least be able to switch between 12 hour and 24 hour formats.
Such an option is commonplace in other software and hardware.

The same logic should apply to date formats to enable users to select their preferred format

This is a dealbreaker for me. Just became a paying customer, this would not have happened if I knew that this basic functionality was lacking.

Did not even think about researching this. Why on earth isn't this an option? It works fine on the cellphone.

Switzerland, where Protonmail is based, is using the 24h format as well.

Most of the world uses the 24 hr format, it is OK if AM/PM is standard, and 24h as an option.

If I install a random app that doesn't support 24 hr and dd-mm-yyyy or yyyy-mm-dd format, I uninstall it. I'll just have to see if I can live with this backwards way of displaying important info until my subscription is up for renewal. Really hope this is fixed soon as Protonmail seems to be perfect in other regards.

NB: This is just as annoying as having a car with mph on the speedo, and all speed limits are posted in kmh, or having a GPS with miles as distance unit, and you live in a country that uses km.

I realize this is not the most important feature to work on but it should be so easy to implement. Being stuck with am/pm is especially irritating; if you have to use one date and time format for all your worldwide customers, at least make it ISO 8601 (yyyy-mm-dd with 24h time).

Protonmail should adjust the date format to the standard that is mostly used worlwide . The most used standard is Day Month Year DMY and NOT the US format MDY- https://en.wikipedia.org/wiki/Date_format_by_country
Thank you ProtonMail team for the improvements.

I'd love to change the 12-hour format to the 24-hour clock...

I'm a Canadian user (time zone EST), I'm ok with the American localization, but as a matter of fact, the time is wrong (nearly everywhere in the world ;) ).
An email sent at 2 pm (my local time) shows as sent at 7 pm, which is not even Swiss time (that would be 8 pm).
It's crucial to allow localizations for time zones, please make that happen, Proton Team. Otherwise, I'm thrilled with your service!

I think this is an essential feature. Every time I have to search for something I'm confused / frustrated by having to read the date stamps in US format.

Yes, changing time/date format would be nice

Please add this feature and bring us away from the Americana-PM/AM nonsense. :-)

Yeah, this is very basic - I mean, what's the date format in Switzerland...? Not, m/d/y

Why not just use the new HTML 5 time and date input tags?

Common make it happen :)

I am a new user to protonmail. The missing 24H option could be a "deal breaker" for me, and is a 100% issue for ever going towards the paid version !

It is very difficult constantly switching between mm/dd/yy and dd/mm/yy which all my other programs and sites use. I am dyslexic.

Please implement the option to choose date format.

also in iOS app please

Yes please... I'd luv to be able to set the date to day/month/year and the time to the location I'm in. If this is currently possible, I haven't yet found how to...

I'd love to be able to customize the date/time display any way we want and have an option by default to auto-detect based on our browser-reported region/timezone via JavaScript.

Having to use MM/DD/YY is disconcerting.

DD/MM/YY option please

I'd like to lend my support to this idea too. The default should be locale specific, as well as making the date/time formats user customisable.