Question

45

Adding days to Date in javascript / typescript gives completely wrong date

rated 0 times [ 47] [ 2] / answers: 1 / hits: 22857 / 8 Years ago, tue, august 2, 2016, 12:00:00

I have this very simple code, and it works sometimes but other times it gives the complete wrong date:

  addDays(date: Date, days: number): Date {

    console.log('adding ' + days + ' days');

    console.log(date);

    date.setDate(date.getDate() + days);

    console.log(date);

    return date;

  }

Here is an example of the output:

Works!

adding 7 days

error-chart.component.ts:118 Tue Aug 02 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))

error-chart.component.ts:120 Tue Aug 09 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))

Stops working:

adding 14 days

error-chart.component.ts:118 Tue Aug 02 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))

error-chart.component.ts:120 Thu Mar 02 2017 00:00:00 GMT+0100 (Vest-Europa (normaltid))

somehow jumps 2 years

adding 14 days

error-chart.component.ts:118 Thu Jul 07 2016 00:00:00 GMT+0200 (Vest-Europa (sommertid))

error-chart.component.ts:120 Thu Jun 14 2018 00:00:00 GMT+0200 (Vest-Europa (sommertid))

now 4 years!

adding 14 days

error-chart.component.ts:118 Thu Jun 14 2018 00:00:00 GMT+0200 (Vest-Europa (sommertid))

error-chart.component.ts:120 Thu Apr 14 2022 00:00:00 GMT+0200 (Vest-Europa (sommertid))

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

xiomara

Add To Favorites

Follow

Total Points: 378

Total Questions: 90

Total Answers: 104

Location: Guernsey

Member since Thu, Oct 7, 2021

3 Years ago

answered 8 Years ago yaquelina · Accepted Answer

You have a problem with types. If days is 14, then it will yield 16th August correctly. However, if days is 14, then it will yield 2nd of March.

Solution:

  addDays(date: Date, days: number): Date {

    console.log('adding ' + days + ' days');

    console.log(date);

    date.setDate(date.getDate() + parseInt(days));

    console.log(date);

    return date;

  }