Adding 30 days to the converted date is giving me Invalid Date message in browser's console log-CodePudding

I have converted the timestamp 4/1/2021 00:00 into the format Thu Apr 01 2021 00:00:00 GMT-0500 (Central Daylight Time) as shown in the code below. However, adding 30 days is not giving me appropriate result.

 
    
//Handling Date String: 4/1/2021 00:00
function setStart(input) {
        if (!(input instanceof Date))
            console.log('Handling Date String:'  input)
            input = new Date(Date.parse(input));

        input.setHours(0);
        input.setMinutes(0);
        input.setSeconds(0);
        input.setMilliseconds(0);

        start = input;
        return start;        
    }
 
var initialDate = setStart('4/1/2021 00:00'); 
console.log("Printing converted date below:"); 
console.log(setStart('4/1/2021 00:00'));


var date = new Date(); // Now
//date.setDate(date.getDate()   30); // Set now   30 days as the new date
date.setDate(initialDate   30);
console.log("Printing date after adding 30 days below")
console.log(date);


/* var getDaysArray = function(start, end) {
    for(var arr=[],dt=new Date(start); dt<=new Date(end); dt.setDate(dt.getDate() 1)){
        arr.push(new Date(dt));
    }
    return arr;
};

var daylist = getDaysArray(new Date("2018-05-01"),new Date("2018-06-01"));

console.log(daylist); */

The browser's console is printing it like the following:

Handling Date String:4/1/2021 00:00
Printing converted date below:
Handling Date String:4/1/2021 00:00
Thu Apr 01 2021 00:00:00 GMT-0500 (Central Daylight Time)
Printing date after adding 30 days below
Invalid Date

What is causing it to print Invalid Date ?

CodePudding user response：

You want to get the date after 30 days from the initialDate, don't you?
refer this

var date = new Date(initialDate); // Now
//date.setDate(date.getDate()   30); // Set now   30 days as the new date
date.setDate(date.getDate()   30);
console.log("Printing date after adding 30 days below")
console.log(date);

CodePudding user response：

You should something like

var date = new Date().getTime(); // Now
const offset = 30*23*3600*1000;
const newDate = new Date(date offset).toLocaleString('en-US', {timeZone: 'CST'}); // Change added
console.log("Printing date after adding 30 days below")
console.log(newDate);