Question 1

What isISOweeknumber？

Accepted Answer

ISO 8601Standard：perweekFromweekoneStart，peryear(s)No.1weekisInclude1month4Day'sthatoneweek。ISOweeknumberRangeas1-53。

Question 2

oneyear(s)has52stillis53week？

Accepted Answer

largemanynumberyear(s)portionhas52week。whenyear(s)portionbyweekfourStartorbyweekthreeEnd（year(s)）time，shouldyear(s)has53week。