Fix timestamp string formatting
Fix timestamp string formatting

The correct placeholder for minutes is %M for strftime
not %I - probably a PHP-ism from `date('H:i:s')`.

StatesOfJersey/e-petitions,alphagov/e-petitions,oskarpearson/e-petitions,joelanman/e-petitions,unboxed/e-petitions,StatesOfJersey/e-petitions,oskarpearson/e-petitions,alphagov/e-petitions,alphagov/e-petitions,joelanman/e-petitions,unboxed/e-petitions,StatesOfJersey/e-petitions,joelanman/e-petitions,alphagov/e-petitions,StatesOfJersey/e-petitions,unboxed/e-petitions,oskarpearson/e-petitions,unboxed/e-petitions