How to make calendar available on share workbook

[BioRoots]

Good day

I use this code for a date picker, work great but then I try to share the file and the date picker was not working.
After some search I believe that if I make the code in work book that will solve the issue but I lack the knowledge to make it happen.
Any help would be welcome
Thank you

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[BioRoots]

Maybe there is an other option?

[BellyGas]

MonthView21 is a form you have in the source workbook. That form must also be present in whatever you've shared this code with.

[BioRoots]

How would i go about doing this ?