Do you know an elegant way to change the time in a Date Object in javascript
The strangness is those setters that return Number object
var date = new Date().setHours(0,0,0,0); date is a Number not a date..
so let's say I have a date var date = new Date()
and I want to change time
Thank you
var date = new Date(); date.setHours( 0,0,0,0 ); setHours() actually has two effects:
So in your case, just create the object and set the time separately afterwards. You can then ignore the return value entirely, if you don't need it.
// Create date. Left empty, will default to 'now' var myDate = new Date(); // Set hours myDate.setHours(7); // Then set minutes myDate.setMinutes(15); // Then set seconds myDate.setSeconds(47); 
var date = new Date() date.setUTCHours(15,31,01); This will return a time of 15::31:01
More info here
The way to do it, get midnight of the current day for example:-
var date = new Date(); // Datetime now date.setHours(0, 0, 0, 0); console.log(date); // Midnight today 00:00:00.000 The setHours function returns a timestamp rather than a Date object, but it will modify the original Date object.
The timestamp can be used to initialize new date objects and perform arithmetic.
var timestamp = new Date().setHours(0, 0, 0, 0); var date = new Date(timestamp); // Midnight today 00:00:00.000 var hourBeforeMidnight = timestamp - (60 * 60 * 1000); var otherDate = new Date(hourBeforeMidnight); // Date one hour before The timestamp is the same value you would get if you called getTime.
var timestamp = date.getTime(); This Snippet will convert the time to 0:0:0 which is needed if you are going to filter data from zeroth hour of the day. Useful for ODATA filtering on Dates
var a = new Array(); var b = new Array(); var c = new Array(); var date = new Date().toJSON(); a = date.split("T"); a = a[0]; b = a.split("-"); var currentDate = new Date(b[0],b[1] - 1, b[2] + 1 ,-19,30,0).toJSON(); c = currentDate.split("."); var newDate = c[0]; console.log(newDate);You can do it like this:
const date = (new Date()).setHours(0,0,0,0); 