The split opmode allows splitting an input product into two, a specific point in time.
The Epoch description must be valid, the expected format is YYYY-MM-DDTHH:MM:SS TS,
for example 2020-01-01T00:00:00 UTC is a valid description.
This example will divide this file in two at noon:
rinex-cli \
--fp data/ESBC00DNK_R_20201770000_01D_MN.rnx.gz \
split 2020-06-25T12:00:00 UTC