Everything related to date update

[thegreenmilecomposer]

https://www.npmjs.com/package/date-fns

check whether the frontend and backend update are the same

https://www.npmjs.com/package/date-fns-tz

Update checklists:

• date-fns
• date-fns-tz
• date-holidays

[Julian-Wogersien]

#164