You have asked about the calendar three times yesterday, here is the posts:
https://vborg.vbsupport.ru/showthread.php?t=309677
https://vborg.vbsupport.ru/showthread.php?t=309684
https://vborg.vbsupport.ru/showthread.php?t=309685
And as stated in all of those posts,
There isn't a calendar function in the software right now. So it'd require a moderate amount of work.
If you are in serious need of a calendar in vB5, best option for now would be to post in the
Paid Requests section, and hire someone to do it.