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No luck finding a sample with ARMW to verify against your example.
The Wireshark wiki page for ethercat has a sample capture that includes the ecat.reg.dc.systime field.

C:\>tshark.exe -r ethercat.cap.gz -T fields -e frame.number -e ecat.reg.dc.systime -Y ecat.reg.dc.systime
17      0x0000000000000000
18      0x0000000000000000

See the Wireshark dfref (Display Filter Reference: EtherCAT datagram(s)) for other systime fields.

No luck finding a sample with ARMW to verify against your example.
The Wireshark wiki page for ethercat has a sample capture that includes the ecat.reg.dc.systime field.

C:\>tshark.exe -r ethercat.cap.gz -T fields -e frame.number -e ecat.reg.dc.systime -Y ecat.reg.dc.systime
17      0x0000000000000000
18      0x0000000000000000

See the Wireshark dfref (Display Filter Reference: EtherCAT datagram(s)) for other systime fields.

See the tshark man page for options to format the output data. -E can be used to specify a , for CSV.