Javascript How to increase Month when Date is over today month [duplicate]-CodePudding

i really stuck at this date. Let say today is 01 20 2021, and i want to add 14 day later to get expired date. so for the expired date should be 02 03 2021, but i only get 01 03 2021. Can anyone help me on this. Thanks

this is my code

    var today = new Date();
  
    var monthIndex = today.getMonth() 1;
    var year = today.getFullYear();

    var addday = new Date(new Date('1.20.2021').getTime() (14*24*60*60*1000));
    var nextDay = addday.getDate();
    var nextMonth = monthIndex;
    console.log('day',day)
    
    return nextMonth '.' nextDay '.' year
 
    //the return that I want is 2.03.2021

CodePudding user response：

You didnt update the value for monthIndex. You must use:

var nextMonth = addday.getMonth() 1;

CodePudding user response：

Just use Date.setDate function for this.

// new Date('1.20.2021') => Jan 20 2021
const dateStr = '1.20.2021';
const [mm, dd, yyyy] = dateStr.split('.');
const today = new Date(yyyy,  mm-1, dd);
// add 14 days
const newDate = new Date(new Date(today).setDate(today.getDate()   14));
console.log(`Today: ${today}`);
console.log(`New Date: ${newDate}`);
console.log(newDate.getMonth()   1   '.'   newDate.getDay()   '.'   newDate.getFullYear());