This is an open-source demo app showcasing how to add qualified sign/seal and timestamps to documents according to the
https://en.wikipedia.org/wiki/EIDAS i.e. all EU trusts documents correctly sign with it. Timestamps are usually paid (few euro cents each) but there are services like
http://tsa.sk.ee which you can use with a limit of free timestamps per month per IP address. Each and every court will trust any timestamped and signed document (you need to you your own qualified signature and a qualified timestamp from a qualified TSA of course)