Fixing issue #798 (#907)

* Fixing issue #798, thanks to @reaperhulk; removing undocumented '%s' option and getting the date in a more robust way

Co-authored-by: Joseba Alberdi <j.alberdi@simuneatomistics.com>
Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>
1 file changed