preprinted datetime dropping fractional information

[jtmoon79]

Problem

Preprinted datetimes (-l, -u) are not setting fractional. (it's always zero).

For example, from an Ubuntu host

$ ./target/release/s4 -l -n -w -a 20220813T120000 -b 20220813T200000 /var/log/
...
ubuntu-advantage-timer.log:20220813T180826.000000 +0000:2022-08-13 18:08:26,175 - timer.py:(46) [DEBUG]: Executed job: update_messaging
...

In the terminal, the datetime is correctly underlined, including the fractional, 2022-08-13 18:08:26,175 (notice 175).
But the preprinted datetime has fractional value 0, 20220813T180826.000000 +0000,

Solution

Set the fractional value in the preprinted datetime.