I'm trying to get the last of day of previous month using the current date:
var myDate = new Date();
According to MDN:
if 0 is provided for dayValue, the date will be set to the last day of the previous month.
But when set date to zero:
myDate.setDate(0)
console.log(JSON.stringify(myDate));
I get "2021-08-01T01:18:34.021Z" which first day of the current month. What is wrong with this approach?
JSON.stringify() is serializing the timestamp with a Z timezone, indicating UTC. The difference between UTC and your local timezone is causing the date to rollover to the next day.
You can use toLocaleString() to print the date in your local timezone:
var myDate = new Date();
myDate.setDate(0);
console.log(myDate.toLocaleString());I would use dateInstance.toString() or dateInstance.toLocaleString():
const myDate = new Date;
myDate.setDate(0); myDate.setHours(0, 0, 0, 0);
console.log(myDate.toString()); console.log(myDate.toLocaleString());You can use date-fns package
var df = require("date-fns")
let myDate = new Date() //Thu Aug 05 2021 22:16:09
let lastDayOfPrevMonth = df.endOfMonth(df.subMonths(myDate, 1)) //Sat Jul 31 2021 23:59:59 GMT-0400