Add datetime test for numeric string.
Add datetime test for numeric string.

andreas-p/nextcloud-server,phil-davis/core,Ardinis/server,andreas-p/nextcloud-server,cernbox/core,xx621998xx/server,endsguy/server,pixelipo/server,jbicha/server,pmattern/server,lrytz/core,endsguy/server,bluelml/core,pollopolea/core,lrytz/core,nextcloud/server,IljaN/core,pollopolea/core,IljaN/core,michaelletzgus/nextcloud-server,cernbox/core,IljaN/core,owncloud/core,pmattern/server,whitekiba/server,nextcloud/server,xx621998xx/server,whitekiba/server,pixelipo/server,pixelipo/server,Ardinis/server,cernbox/core,pmattern/server,cernbox/core,pollopolea/core,sharidas/core,bluelml/core,owncloud/core,lrytz/core,Ardinis/server,lrytz/core,lrytz/core,endsguy/server,IljaN/core,whitekiba/server,pmattern/server,jbicha/server,Ardinis/server,jbicha/server,andreas-p/nextcloud-server,xx621998xx/server,owncloud/core,sharidas/core,owncloud/core,michaelletzgus/nextcloud-server,pollopolea/core,Ardinis/server,endsguy/server,michaelletzgus/nextcloud-server,owncloud/core,sharidas/core,xx621998xx/server,bluelml/core,bluelml/core,pixelipo/server,whitekiba/server,endsguy/server,nextcloud/server,pollopolea/core,bluelml/core,nextcloud/server,xx621998xx/server,jbicha/server,jbicha/server,cernbox/core,sharidas/core,michaelletzgus/nextcloud-server,IljaN/core,whitekiba/server,andreas-p/nextcloud-server,pixelipo/server,andreas-p/nextcloud-server,pmattern/server,sharidas/core