Have you ever wondered if two dates are in the same week? I have. So I wrote this function to detect such an event.
Enjoy!
function areSameWeeks(date1, date2, boundaryDay=0) { if(date1 > date2) { let t = date1; date1 = date2; date2 = t; } if(((((date2 - date1)/1000)/3600)/24)>6) { return false; } let day1 = date1.getUTCDay(); let day2 = date2.getUTCDay(); if(day1 == boundaryDay) { return true; } if(day2 == boundaryDay) { return false; } let d1BoundaryDist = ((day1-boundaryDay)+7)%7; let d2BoundaryDist = ((day2-boundaryDay)+7)%7; if(d1BoundaryDist <= d2BoundaryDist) { return true; } return false; } 
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