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Megan Weber
32,795 PointsWhy doesn't my date calculation give an integer?
When I try to calculate the number of days in the current month, I get a number which is very close to an integer, but isn't one. Why is this? Here's my code:
let now = new Date();
let past = new Date(now.getFullYear(), now.getMonth(), 1);
let future = new Date(now.getFullYear(), now.getMonth() + 1, 1);
console.log(((((future - past)/1000)/60)/60)/24);
The console says 30.958333333333332. I'm using Chrome.
1 Answer
Steven Parker
243,656 PointsThe calculations are based on local time, and this month includes a switchover to daylight saving time. So if your system timezone setting includes daylight time (which it apparently does), not all days have 24 hours this month.
This calculation will produce an integer for other months without DST switchovers..
Megan Weber
32,795 PointsThat makes sense. Rounding will always give the correct number, right?
Steven Parker
243,656 PointsRounding should work well, since it's only 1/24 of a day off during a shift month.
Jason Anders
Treehouse Moderator 145,863 PointsJason Anders
Treehouse Moderator 145,863 PointsYou haven't attached any code? Please post the code you are trying so we may be able to assist you. Make sure the code is formatted correctly for the Community Forum. Refer to the Markdown Cheatsheet link above the Post button if you are unsure.
:)