A week is a unit of time equal to seven days. It is the standard time period used for short cycles of days in most parts of the world. The days are often used to indicate common work days and rest days, as well as days of worship. Weeks are often mapped against yearly calendars, but are typically not the basis for them, as weeks are not based on astronomy. Ancient cultures had different "week" len
![Week - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/82eb31bc47a0841934cf02f044e56175c3d628bd/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2Fe%2Fe2%2FFirst_Day_of_Week_World_Map.svg%2F1200px-First_Day_of_Week_World_Map.svg.png)