A bare YYYY-MM-DD, or exactly midnight in timeZone (how an EMR stores a date it recorded without a time), is a day; any other value is an instant. Null only when the value does not parse.
YYYY-MM-DD
timeZone
day
instant
A bare
YYYY-MM-DD, or exactly midnight intimeZone(how an EMR stores a date it recorded without a time), is aday; any other value is aninstant. Null only when the value does not parse.