Use bootstrap-datepicker for metadata Dates

[jykae]

Closes #852
Closes #853
Closes #854

[marla-singer]

@jykae Yeah, works good and error handler has too. If this type of date is acceptable, I will merge it

[jykae]

@marla-singer I check tomorrow if I could possibly make it nicer. At least remove time part away.

[jykae]

@marla-singer date format improved

[marla-singer]

@jykae Validate date isn't updated if I change only one date.
Steps: Enter both field: Validate since and Validate until, save it
Click on button "Edit metadata" and delete one of these fields, save it
Found: Fields aren't updated

But if you delete both fields, they'll disappear both

[jykae]

@marla-singer Good find, there is an open issue, Meteor-Community-Packages/meteor-autoform-bs-datepicker#24

I try to figure out something..

[marla-singer]

@jykae I will approve it on Monday

[jykae]

Forked, fixed, published package with fix. https://github.com/apinf/meteor-autoform-bs-datepicker

[jykae]

@marla-singer how it feels now? does it function like expected?

[marla-singer]

@jykae Unfortunatly no :( Now If Validate since and Validate util exist and I try to delete only Validate until then I have message about "End date must be after begin date"

[jykae]

@marla-singer how you would like it to behave? Only validate time frame if BOTH fields have value? And allow cases: only valid since value & only valid until value?

[marla-singer]

@jykae Steps:

1. Fill the fields "Valid since" and "Valid until" with the correct date
2. Save forn
3. Click on button "Edit metadata" and delete the value from "Valid until"
4. Click on Save button

I've got the next results

[jykae]

@marla-singer added check, now we compare only if we have both Dates. How about now?

[marla-singer]

@jykae Good. Merge it