Creating Date and time

Date and Time in javascript is an in-built object.

Date Creation

There are some ways you able to create date. 

1. new Date() - No need to pass any arguments here. It will directly give the current date and time.

let now = new Date();
alert( now ); // display current date/time

2. new Date(milliseconds) - Pass milliseconds as argument.Here date calculation will be calculated after Jan 1st of 1970 UTC+0.

let Jan01_1970 = new Date(0);
alert( Jan01_1970 );

Output :
Thu Jan 01 1970 05:30:00 GMT+0530 (India Standard Time)

3. new Date(datestring) - Pass a string date here.

let date = new Date("2017-01-26");
alert(date);

Output : 
Fri Jan 26 2018 05:30:00 GMT+0530 (India Standard Time)

4. new Date(year, month, date, hours, minutes, seconds, ms) -  

The year must have 4 digits: Example 2018 2020 etc.,

The month count starts with 0 (Jan), up to 11 (Dec). Remember month starting from zero. 

The date parameter is actually the day of month, if not then 1 will be considered.

If hours/minutes/seconds/ms is absent, they could be considered as 0.

new Date(2011, 0, 1, 0, 0, 0, 0); // // 1 Jan 2011, 00:00:00
new Date(2011, 0, 1); // the same, hours etc are 0 by default