getWeekNumber() 
ts
function getWeekNumber(date: Date): number;Calculates the week number for a given date.
Parameters 
date 
Date
the date to calculate the week number for
Returns 
number
the week number
See 
https://stackoverflow.com/a/6117889/1146207
Example 
ts
getWeekNumber(new Date('2023-01-01')) // => 52