TShark timestamp precision

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Hello,

When I use a command like the following:

tshark -r file.pcap -t a -Tfields -e _ws.col.Time -e field2 -e field3 -e field4

It will print each line beginning with the time of capture, without a date:

15:19:37.268975802

This shows me the time with nanosecond precision, however I was wondering if there's any way to remove that part and show seconds only.

I can easily do this in Wireshark (View > Time Display Format > Seconds) but I couldn't find any way to do it with TShark even after reading the manpage.