How to convert svn repository change date to epoch timestamp?

[mj-mailinglist at gmx.de]

Hi,

I am trying to convert the output of this command

svnlite info --show-item last-changed-date /usr/src/

to an epoch timestamp with base tools.

The output looks like this: 2019-11-03T07:11:09.005639Z

The date man page gives this example for converting dates:

date -j -f "%a %b %d %T %Z %Y" "`date`" "+%s"
(maybe add the info, that you have to use LC_TIME=C for this example to work)

I came up with this date format string "%Y-%m-%dT%H:%M:%SZ" but this
lacks the fractions part of the seconds.

Is this possible with the tools in base?

Or maybe i could chop of the second-fractions?

--
Martin