Adjusting the date backward by one month results in a difference of 30 days, transitioning from July 31st to August

I'm feeling a bit overwhelmed by the code below.

var forDt = new Date("2017-07-31"+ "T09:00:00.000");
    var workDt = new Date();
    workDt.setDate(forDt.getDate() - 1);
    date_prev = workDt.toISOString().slice(0, 10);

Today is August 1st. I clicked a Prev button twice and datePrev changed from July 31 to August 30.

I need some assistance in figuring out what went wrong in my code. It seems like setDate() is setting 31-1=30 without updating the month. Can someone help me fix this issue?

Thanks in advance, everyone! =)

javascriptdatedatetime

Answer №1

When you create a new Date(), the variable workDt will now represent the current date of the system.

var forDt = new Date("2017-07-31" + "T09:00:00.000");
var workDt = new Date(forDt.getTime());
workDt.setDate(forDt.getDate() - 1);
date_prev = workDt.toISOString().slice(0, 10);

console.log(date_prev);

workDt.setDate(workDt.getDate() - 1);
date_prev = workDt.toISOString().slice(0, 10);

console.log(date_prev);

By using new Date(forDt.getTime()) to set workDt, you are creating a duplicate of the date you want to adjust. By modifying the day of the month, you will arrive at the correct result.

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