Calculate elapsed time inside QML

[Damian7546]

Hi,

I need calculate elapsed time form readed timestamp.
In QML I do like below:

var readed = new Date(timestamReaded * 1000)
var actual = new Date()
var elapsed = new Date(actual - readed)

function roundToHour(date){
	var p = 60*60*1000;
	return new Date(Math.round(date.getTime() /p)*p)
}

var elapsedAround = roundToHour(elapsed);

mytextfield.text = elapsedAround.getHours()

It works, but only when reded timestamp and actual date is in the same day.... What I should change to calculate hours when readed timestamp is from previus day ?

[piervalli]

@Damian7546
If you need to calculate diff date, you can use a simple js algoritme.
You can use a simple js date

function inDays (d1, d2) {
            var t2 = d2.getTime();
            var t1 = d1.getTime();

            return Math.floor((t2-t1)/(24*3600*1000));
        }
 function inHours (d1, d2) {
            var t2 = d2.getTime();
            var t1 = d1.getTime();

            return Math.floor((t2-t1)/(3600*1000));
        }

Component.onCompleted:{
        var d1 = new Date()
        var d2 = new Date(2023,3,1)
        console.error("inDays",inDays(d1,d2))
    }

Olther examples are in the link of stackoverflow, for hours

Instanded console.time and console.timeEnd is used to calculated diff time in a function (benchmark)

https://stackoverflow.com/questions/7763327/how-to-calculate-date-difference-in-javascript

[piervalli]

@Damian7546

You can use use.

console.time("wholeFunction");
console.timeEnd("wholeFunction");

https://doc.qt.io/qt-6/qtquick-debugging.html

[A Former User]

This post is deleted!

[Damian7546]

@piervalli I am still don't understand ....

[piervalli]

@Damian7546
If you need to calculate diff date, you can use a simple js algoritme.
You can use a simple js date

function inDays (d1, d2) {
            var t2 = d2.getTime();
            var t1 = d1.getTime();

            return Math.floor((t2-t1)/(24*3600*1000));
        }
 function inHours (d1, d2) {
            var t2 = d2.getTime();
            var t1 = d1.getTime();

            return Math.floor((t2-t1)/(3600*1000));
        }

Component.onCompleted:{
        var d1 = new Date()
        var d2 = new Date(2023,3,1)
        console.error("inDays",inDays(d1,d2))
    }

Olther examples are in the link of stackoverflow, for hours

Instanded console.time and console.timeEnd is used to calculated diff time in a function (benchmark)

https://stackoverflow.com/questions/7763327/how-to-calculate-date-difference-in-javascript