[peoplefromibiza]

> IE, web component where you can set a format string and then the browser renders it substituting the info it has?

you can easily detect this

    - please display this localdatetime as a string
    - read it back and parse it
    - are they (almost) exactly multiples of 60 minutes apart?
    - if yes it's most probably your timezone

[hedora]

Do apps really need to read back strings they omitted?

[peoplefromibiza]

they don't, but they can and by doing it they can check if the date has been changed by the browser because of time zone shift.