No, 4 weeks is not equal to 1 month.
There are 30 or 31 days in a normal month. There are 7 days in 1 week. 4 x 7 = 28.
1 month is equal to 4 weeks and 2-3 days.
Also, this doesn't bother me. Online time is online time, who cares..
That's just me though.