>Now use the expression, milliseconds/week to get the number of weeks.
Same for month and year.
this holds true for days and weeks but not for months!! (or a leap year)
consider this:
Q: How many sec are there in one minute?
A: 60 - ALWAYS! (well...unless you are not on planet earth :-) )
How many weeks are there in one month?
Depends!!! - is it February or August (and Peter pointed out this correctly)
The bottom line is that there are no 4 weeks in a month and the calc offered to derived from the millisocnds will not help you in this case. you can use it for days and weeks (year also but check special cases where the year can be divided by 4 or 400 - leap year)