Javascript-php in 2015, 53 weeks, how is it calculated? How should JS be calculated?

Source: Internet
Author: User
Title, Thank you!

Just a moment ago, I do not know the conclusion is right:

The first day of the year is from Monday to Thursday, the first week of the year;
The last day of the year is from Thursday to Sunday, and the 53rd week of the year is counted.

Reply content:

Title, Thank you!

Just a moment ago, I do not know the conclusion is right:

The first day of the year is from Monday to Thursday, the first week of the year;
The last day of the year is from Thursday to Sunday, and the 53rd week of the year is counted.

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