Why don't all months have same number of days?
Why do different months have different days?
Why the month February has only 29 days? Why week and month are used to time pregnancy instead of day? Why do we have 28 or 29 days in February, where as July and August have 31 days consecutively? How many days are in a month? Why do July and August both have 31 days consecutively? Why are days of the year biased toward certain days of the week? Why isn't there 13 months in a year? Why does February's 29 days come after 4 years? Why are there seven days in a week? Why does february has 28 or 29 days only? Why does February have 28 days? Why 29 in leap years? Why there are 7 days in a week? Why does the 29th of February only come every 4 years? 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? Which thing comes once in a year and twice in a month? Why did I period two time in one month? Why is January a depressing month? Why do periods last so long? Why does only February has 1 extra day in leap year? Why are there only 7 days in a week? Why do after every 28 years there is the same day? Why did I have a period that was 12 days early and lasted only for one day? Why do women have their period once in 28 days? Why does a day have 24 hours? What is the reason behind change of seasons? Why a day/week/month/year doesn't feel like it anymore? Why is the leap year day included in February and not in any of the other months? Why can't the iOS Calendar app set a recurring event for dates such as 'the first Monday of each month'? When people say "in a couple of days" how many days do they mean? Calendars: Why did September 1752 have fewer days?