DatetimeIndex.
indexer_at_time
Return index locations of index values at particular time of day (e.g. 9:30AM).
datetime.time or string in appropriate format (“%H:%M”, “%H%M”, “%I:%M%p”, “%I%M%p”, “%H:%M:%S”, “%H%M%S”, “%I:%M:%S%p”, “%I%M%S%p”).
See also
indexer_between_time
DataFrame.at_time