Why don't all months have same number of days?
Why do different months have different number of days?
How many days are in a month? Why the month February has only 29 days? Why do we have 28 or 29 days in February, where as July and August have 31 days consecutively? Why are days of the year biased toward certain days of the week? Why do July and August both have 31 days consecutively? Why are there seven days in a week? Why there are 7 days in a week? Why isn't there 13 months in a year? Why does February's 29 days come after 4 years? Which thing comes once in a year and twice in a month? Why does february has 28 or 29 days only? Why are there only 7 days in a week? Why does February have 28 days? Why 29 in leap years? When people say "in a couple of days" how many days do they mean? How many days are in a week? Why is the extra day of leap year added only to the month of February? Why is February the month having the least no.of days, why not any other month? Why does the 29th of February only come every 4 years? What are the historical reasons as to why February has 28 days? Why does a day have 24 hours? Why does only February has 1 extra day in leap year? Calendars: Why did September 1752 have fewer days? In a non-leap year, which is greater: the mean number of days per month or the median number of days per month? How many weeks in year? Why did I period two time in one month? Why did many ancient calendars have only 360 days in a year? Shouldn't they have known that it is actually closer to 365 days? Why did I have a period that was 12 days early and lasted only for one day? Why can't the iOS Calendar app set a recurring event for dates such as 'the first Monday of each month'? Why do clocks have 12 hours? Why is the leap year day included in February and not in any of the other months? Why do women have their period once in 28 days?