Issue #1280658 and follow up to Issue #1238660 by KarenS and tockliasteroid, Rework the format control over the summary title and apply it to the title() callback.

Issue #1285224, Make sure Date Migrate works for importing repeating dates now that widgets have changed.

Issue #1302374 by miro_dietiker, Account for an inconsistency in core handling of non-existant date formats.

Issue #1292898, Check for all day checkbox in the basic date element validation so empty time for newly added elements still passes validation.

Issue #1252952 follow up, Move checkbox setting to the same spot where time is set, and don't show option on dates without time.

Issue #1017866, Fix miscellaneous problems where filter/argument incorrectly do timezone adjustment.

Issue #1153766, Adapt metadata functions to the pattern in the current Entity code, add  to the getters.

Issue #1052586 by jpsolero, Problem with Date API when using Calendar with argument set to "Week" granularity and "current date" default argument

Issue #1286570, Fix undefined index error caused by using a remember value without checking if it exists.