v-model to accept ISO datetimes

[IlyaSemenov]

Is your feature request related to a problem? Please describe.
Typically, external APIs send and receive dates in ISO datetime format. I'm always frustrated that I need to add cumbersome watch/computed/type conversion boilerplate to convert between ISO datetime and the formats the date picker supports (native Date or timestamp or date-fns tokens).

Describe the solution you'd like
I'd like model-type to support new option: iso.

Describe alternatives you've considered
For dates (not date+time+timezone) I could use model-type="yyyy-MM-dd". However, it doesn't seem possible to construct the full ISO8601 datetime string as T seems to be a reserved token in date-fns formatter that you're using. Also, this kind of manual format templating is prone to mistakes/typos.

[Jasenkoo]

The ISO string can be natively parsed with new Date(), meaning you just pass the date string as it is to the datepicker. When you move it from the v-model just use .toISOString()

You can also use T , just need to wrap it in quotes, 'T'

[IlyaSemenov]

That's basically what I was referring to: boilerplate conversion.

Instead of doing:

<vue-date-picker v-model="fields.startTime" model-type="iso" />

one has to repeat this for each field:

<vue-date-picker
  :model-value="fields.startTime"
  @update:model-value="v => fields.startTime = v?.toISOString()"
/>

I'm not really following why timestamps have first class support and ISO time, arguably much more popular format, doesn't deserve one. 🤔

[Jasenkoo]

You are right, I'll add it, it is a minor thing to implement.