1. Monday: Monday, abbreviated form: Mon.

2. Tuesday: Tuesday, abbreviated form: Tues.

3. Wednesday: Wednesday, Abbreviated form: Wed.

4. Thursday: Thursday, abbreviated form: Thur./Thurs.

5. Friday: Friday, abbreviated form: Fri.

6. Saturday: Saturday, abbreviated form: Sat.

7. Sunday: Sunday, abbreviated form: Sun.

Extended information:

Week as time Cycles first originated in Babylon. The world-wide weekly system was officially established by the Roman Emperor Constantine on March 7, 321 AD.

In ancient China, it was called Qiyao. During the Xia, Shang and Zhou dynasties in China, Qiyao refers to the seven major stars including the sun, the moon, and the five planets. It was an important organizational component of the astronomical phenomena at that time, but it did not express the meaning of a time cycle. Later, it was borrowed and used as a time unit of seven days per week, so it was called a week.