Retrieves the hour of the day represented by @datetime in the gregorian calendar. The return is in the range of 0 to 23. Call gst_date_time_has_haur before, to avoid warnings.
Return: the hour of the day
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Retrieves the hour of the day represented by @datetime in the gregorian calendar. The return is in the range of 0 to 23. Call gst_date_time_has_haur before, to avoid warnings.
Return: the hour of the day