Man pages matching name tsmimehdrfieldvaluedateset in section 3ts:

TSMimeHdrFieldValueDateSet.3ts.en	debian 10 / trafficserver-dev
TSMimeHdrFieldValueDateSet.3ts.en	debian 11 / trafficserver-dev
TSMimeHdrFieldValueDateSet.3ts.en	debian 12 / trafficserver-dev