How to subtract and plus date in react native

Question

Actually, i am stuck in one problem that is about Date.

I want to subtract and plus the date in react native.

is there any solution about it.

I have used Moment.js but the error occurs in it so please help me.

Thank you in advance

Answer 1

check below working example of add and subtract day, month and date using moment:

For Day

let tomorrow = new Date();
tomorrow = moment(tomorrow).add(1, 'day').format('YYYY-MM-DD'); // for specific format

let today = moment(new Date()).format('YYYY-MM-DD');

let tomorrow = new Date();
tomorrow = moment(tomorrow).add(1, 'day').format('YYYY-MM-DD');

For Month

moment(currentMonth).add(1, 'month');
moment(currentMonth).subtract(1, 'month');

For Date

let now  = "14/11/2016";
let then = "03/12/2017";

let diff = moment(now,"DD/MM/YYYY").diff(moment(then,"DD/MM/YYYY"));
let duration = moment.duration(diff);
let result = duration.format("hh:mm:ss");

Please refer detailed date difference: https://stackoverflow.com/a/18624295/6592263

EDIT (Not tested)

To get Month

let d = moment(new Date());
d.month(); // month number
d.format('ddd MMM DD YYYY');

TO get Year

let d = moment(new Date());
d.year() // year

Answer 2

If you want to take today date and add a year, month or a day, you can first create a date object, access the relevant properties, and then use them to create a new date object:

    const date = new Date();

    const year = date.getFullYear();
    const month = date.getMonth();
    const day = date.getDate();

    const c = new Date(year + 1, month, day) // PLUS 1 YEAR
    const d = new Date(year, month + 1, day) // PLUS 1 MONTH
    const f = new Date(year, month, day  + 1) // PLUS 1 DAY

Answer 3

My use case was to get end date after adding some months. This works without using moment.

function formatDate(date) {
   var monthNames = [
     "January", "February", "March",
     "April", "May", "June", "July",
     "August", "September", "October",
     "November", "December"
   ];

   var day = date.getDate();
   var monthIndex = date.getMonth();
   var year = date.getFullYear();

   return day + ' ' + monthNames[monthIndex] + ' ' + year;
 }
     

function add_months_todate(dt, no_of_month) 
     {
       return new Date(dt.setMonth(dt.getMonth() + no_of_month));      
     }
    
    start_date = new Date();
    end_date = add_months_todate(new Date(), 10); 

console.log("START DATE",formatDate(start_date));
console.log("END DATE",formatDate(end_date)); 

Reference :https://www.w3resource.com/javascript-exercises/javascript-date-exercise-43.php