HOUR
This function returns just the hour from a date time field.
HOUR( <date_field or date> )
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date_field or date: A date field or value.
Note: dates in Audiences need to be formatted as either YYYY-MM-DD or MM/DD/YYYY. Entering a date as 01-02-2023 would be read as Jan-2 not 1-Feb.
Example: create a field on the ISSUE table that gives the hour that an issue was fixed.
HOUR( [ISSUE.Done Date And Time] )