This chart shows First Day of the Week in Different Countries.

A week is a time unit equal to seven days. It is the standard time period used for cycles of work days and rest days in most parts of the world, mostly alongside the Gregorian calendar.

The days of the week were named in different languages after classical planets, various deities and heavenly bodies and other sources.In English, the names are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.

The term "week" is sometimes expanded to refer to other time units comprising a few days, such as the nundinal cycle of the ancient Roman calendar.

A week is defined as an interval of exactly seven days, so that technically, except at daylight saving time transitions or leap seconds,

1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds.

With respect to the Gregorian calendar:

1 Gregorian calendar year = 52 weeks + 1 day (2 days in a leap year) 1 week = 1600⁄6957 ≈ 22.9984% of an average Gregorian month