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I presume we will need to run this pass the Incubation sponsors to see if this concept will fly.
JS Calendar Replacements
Potential JS Calendar replacements are listed below. The advantage of using a replacement calendar is that there is no developer build step required (which is a pretty big advantage). However one issue with these widgets is their large size 150-250KB.
YUI Calendar
One contender is YUI Calendar http://developer.yahoo.com/yui/calendar/ which has a BSD license.
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The Interval Selection calendar is quite impressive. http://developer.yahoo.com/yui/examples/calendar/intervalcal.html
There appears to be no time support.
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Another contender is jQuery DatePicker http://jqueryui.com/demos/datepicker/ which has a MIT and LGPL license.
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This widget unfortunately has quite large dependencies 155.58 kb, minimised
There appears to be no time support.
CalendarDateSelect
Another option is CalendarDateSelect http://electronicholas.com/calendar which has a MIT license.
This control has time support, but has a JS dependency on the prototype library which could potentially impact JS code using the jquery library.