🐛  fix date helper bug (#7960)
🐛  fix date helper bug (#7960)

closes #7655
- caused by a wrong config usage
- whenever you call config.set({key: value}) the timezone was overridden to the default Etc/UTC
daimaqiao/Ghost-Bridge,klinker-apps/ghost,klinker-apps/ghost,daimaqiao/Ghost-Bridge,pollbox/ghostblog,pollbox/ghostblog,daimaqiao/Ghost-Bridge