DAY OF THE WEEK
For date between January 1st -4000 and December 31th 2500
The number of each day inside its year is provided from 1567.
The standardized classification of the weeks is from 1976.
Recommendations of the International Standardization Organization :
- Monday is the first day of the week.
- The weeks of the same year are numbered from 01 to 52 (sometimes 53).
- The week which carries number 01 is the one which contains first Thursday of January.
- A 53rd week may occur in a common year finishing on Thursday, or in a leap year finishing on Thursday or Friday.
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