The way this site we inherited chose to help customers pick an appointment date. You have to calculate the week number of the day you want to have the appointment on. Just why!?

Because having a date and time picker is just too difficult for some people.

Welcome to devRant 🤓

If we would switch to a 13 month calendar already it wouldn't be a problem...

4 weeks to a month, 13 months to a year, 1 day at the end called year day not in any of the months or if you must have a 29th December then fine.

The 1st of every month is always a Monday, the 3rd always a Wednesday etc.

The second week of the 7th month is the 6X4 +2 26th week.

Easy maths.

@seraphimsystems didn’t know but Kodak used it for over 70 years...

https://en.m.wikipedia.org/wiki/...