When i click the field to choose a date, the pop up, do not stay on the screen to choose other the date.

Yeah, getting this bug as well on Chrome.

Weird, it seems to be working fine in Firefox. I know what's causing it, but I added the bit of code to stop another issue from happening during the 1.0 development....I don't remember exactly what the other issue was though I think it had to do with the datepicker in modals, which is basically all we have, unfortunately. Anyways, if I remove my fix for whatever that other issue was, it seems to work in Chrome. It sort of flickers for some reason there, whereas Firefox looks perfect, but at least you can access the datepicker now. I'm going to keep tinkering with it for a bit, but I'll push out a fix soon.

EDIT: Ah-ha! I remember now what the issue was. If you pop open the datepicker and select a date (or don't, doesn't matter), then switch the tab in your browser and come back...the datepicker opens up again. I had put a fix in to prevent that from happening, but that apparently breaks the datepicker altogether in Chrome I'll try to come up with a different fix.

EDIT 2: Fix has been deployed!

Thank you for your attention. By the way I love the site.