Week
1 Week = 7 Days
A week has seven days:
| Day of the Week | In 3 Letters | 
| Monday | Mon | 
| Tuesday | Tue | 
| Wednesday | Wed | 
| Thursday | Thu | 
| Friday | Fri | 
| Saturday | Sat | 
| Sunday | Sun | 
But it doesn't have to be Monday to Sunday ...
... a week can be any period of 7 days.
Example: Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday and Monday together make one week.
It could also go from one time to the same time 7 days later:
Example: From Midday on Thursday to Midday the next Thursday is also one week.
This calendar highlights one week (click on any day, a whole week is shown):
Weekdays and Weekend
A weekday is one of the days when people normally go to work or school. In most English-speaking countries the weekdays are:
Monday, Tuesday, Wednesday, Thursday and Friday.
The weekend is the days at the end of the week that are not weekdays. In most English-speaking countries the weekend is:
Saturday and Sunday.
Weeks in a Month
How many weeks in a Month?
Well, Months have different lengths:
- If the Month has 30 Days, then it has 4 Weeks and 2 Days
 - If the Month has 31 Days, then it has 4 Weeks and 3 Days
 - February has exactly 4 weeks, except in a Leap Year it has 4 weeks and 1 Day
 
In general you can say:
A Month is about 413 weeks
Weeks in a Year
- A normal year has 365 days, which is 52 Weeks and 1 Day
 - A leap year has 366 days, which is 52 Weeks and 2 Days
 
Names

How did the days get their names?
- Monday: The Moon
 - Tuesday: Tyr (the Norse God)
 - Wednesday: Odin (the Norse God)
 - Thursday: Thor (the Norse God)
 - Friday: Freya/Frigg (the wife of Odin)
 - Saturday: Saturn
 - Sunday: The Sun
 
 Maybe we could call them MoonDay, TyrDay, OdinDay, ThorDay, FreyaDay, SaturnDay and SunDay!