Count Days in month

Question

Hi Team members,
we are working on a budgeting application and stuck on below Research, please assist/advise is there any built-in Function to count Days in a Month which we can use or a work around .
Requirement:
To calculate budgeted Expenses per month, user will enter the daily budgeted expenses for a month and it will multiple with total number of days in a month via formula. same thing happens to some revenue items.
Note:
every months contains different number of Days which will result in change in Expense/Revenue figures.
e.g
Daily Expense for Jan will be $100/day
total days in Jan = 31
Result will be 31*100 = $3100 expense in Jan
but in Feb it will be
Daily Expense for Feb will be $100/day
total days in Jan = 28
Result will be 28*100 = $2800 expense in Feb
Regards,
Alee

Answer 1

Dear Alp,
Thanks for the Code!!!
Note:
In general terms the algorithm for calculating a leap year is as follows...
A year will be a leap year if it is divisible by 4 but not by 100. If a year is divisible by 4 and by 100, it is not a leap year unless it is also divisible by 400.
Thus years such as 1996, 1992, 1988 and so on are leap years because they are divisible by 4 but not by 100. For century years, the 400 rule is important. Thus, century years 1900, 1800 and 1700 while all still divisible by 4 are also exactly divisible by 100. As they are not further divisible by 400, they are not leap years.
Regards,
Alee