* Overrode ``EntryModel.{get,set}`` to return a ``Date`` object and allow you to
set the value with either a ``Date`` object, or the JSON date string.
* Updated code to reflect the ``EntryModel.timestamp`` data change.
* Added ``daysApart`` to calculate calendar days between given ``Date``s
* Added ``getEnglishDate`` to return a date description relative to the current
day ("Today", "Last year" for example).
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