Sean Harvey 8fdc531345 BUGFIX Ensure Date and Datetime field types actually set NULL, false, empty string values correctly instead of "1970-01-01" which gets saved to the database instead of NULL.
BUGFIX Datetime::Nice() and casting methods return NULL when there is no value, to be consistent with Date::Nice() and so on
2012-02-24 20:37:58 +13:00
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