stack/erp5: backport DateTime fixes

7 jobs for for_testrunner_1 in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:13:21

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:36:27

passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Buster

00:51:33

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:45

failed SlapOS.Eggs.UnitTest-Master.Python3

00:16:28

failed SlapOS.Eggs.UnitTest-Master.Python3Next

00:18:36

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:33:30