How to get the date range in javascript

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I have a requirement to get these dates below in javascript.

I have a drop down with values

Last 15 days

Last month

Last 3 months

Last 6 months

Last 12 months

Now consider if Today's date is Oct 2 2019 and
if i select

Last 15 days

date range i should get is

(Sept 15 '19 - Sept 30 '19)

if i select

Last month

date range i should get is

(Sept 1 '19 - Sept 30 '19 )

if i select

Last 3 months

date range i should get is

(July 1 '19 - Sept 30 '19)

if i select

Last 3 months

date range i should get is

(April 1 '19 - Sept 30 '19)

if i select

Last 12 months

date range i should get is

( Sept 1 '18 - Sept 30 '19)

Now consider if Today's date is Oct 20 2019

if i select

Last 15 days

date range i should get is

(October 1 '19 - Oct 15 '19)

if i select

Last month

date range i should get is

(Sept 1 '19 - Sept 30 '19)

if i select

Last 3 months

date range i should get is

(July 1 '19 - Sept 30 '19)

if i select

Last 3 months

date range i should get is

(April 1 '19 - Sept 30 '19)

if i select

Last 12 months

date range i should get is

(Sept 1 '18 - Sept 30 '19)

Time range can be of database format.

What I have tried:

i am checking with moment js Managing Dates and Times Using Moment.js[^] and i am working more on below. If any body can help me to get this work really appreciated. Thank you. I will update here with my outcomes.

Posted 15-Dec-19 23:43pm

Member 8478234

Updated 17-Dec-19 2:12am

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Comments

ZurdoDev 16-Dec-19 8:04am

There are tons of examples online. Where are you stuck?

Member 8478234 16-Dec-19 12:53pm

can you provide me any link. Thank you.

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Maciej Los · Answer 1 · 2019-12-16T21:24:00

Quote:
...
if Today's date is Oct 2 2019 and
if i select "Last 15 days" date range i should get is (Sept 15 '19 - Sept 30 '19)
...
if Today's date is Oct 20 2019
if i select "Last 15 days" date range i should get is (October 1 '19 - Oct 15 '19)

Seems your issue is related to the algorithm which returns proper end-date of range depending on current date.
The answer is pretty obvious: you have to check if current day is less or greatest than 15. In pseudo code:

JavaScript

if (moment.date() < 15)
{
    enddate = moment.date(0); //last day of previous month
    begdate = enddate.subtract(15, 'days'); //or enddate.add(-15, 'days');
}
else
{
    enddate = moment.date(15); //15. day of current month
    begdate = moment.date(1); //1. day of current month
}

Now, you know how to get last 15 days. The rest belongs to you.

For further details, please see:
Moment.js | Docs[^]
javascript - MomentJS - How to get last day of previous month from date? - Stack Overflow[^]

Member 8478234 · Answer 2 · 2019-12-16T22:07:00

let startDate = '', endDate = '';

//date range from 15th to end of previous month
const date = moment().subtract(1,'months').startOf('month').format('MM/DD/YYYY');
console.log('format - startDate', date)
startDate = moment(date, "MM/DD/YYYY").add(14, 'days');
console.log('start date', formatDateforDatePicker(startDate))
endDate = moment().subtract(1,'months').endOf('month').format('MM/DD/YYYY');
console.log('end date', endDate)

//date range from start to 15th of same month
startDate = moment().startOf('month');
console.log('format - startDate', formatDateforDatePicker(startDate))
endDate = moment(startDate, "MM/DD/YYYY").add(14, 'days');
console.log('endDate', formatDateforDatePicker(endDate))

How to get the date range in javascript

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