How to add an hour (or more) to timepicker value?

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1

Hi everyone, is there a way to change the value of a timepicker to any number of hours, minutes and
Seconds to add?

Here’s an example:

Someone decides to attend an event. The event starts at 8 am and lasts approximately 1.5 hours. I would now like to display the time by which you are finished. Does anyone have any ideas about this?

I tried to add an addhour element to the timepicker, but it didn’t work.

I had imagined the following:

Date newDate = DateUtils.addHours(oldDate, 3);
2

How to solve your PROBLEM ?

  1. a DATE consists of MILLISECONDS started in:
    YEAR ------> 1970
    DATE -------> 01.JANUARY
    TIME: -------> 00:00:00

How much milliseconds we would get TODAY? (remember the timer was started 1970).

So let’s find it out!
1000millis x 60secs x 60mins x 24h x 365days x 51years

RESULT =???

let myCalculatedTimestamp = 1000*60*60*24*365*51; console.log(myCalculatedTimestamp);

We get this one…

//RESULT = 1608336000000

Of course this is still not correct, because we already have 11.11.2021
That means →
+11-Month
+11-Days
+7-hours (of my located-time) your time will differ from my time

Calculating an exact current time-stamp you can do here…

You event don’t have to do it, because you have an LIVE-RUNNING-TIMER, which shows you every second the current timestamp of today.

But how to get the current timeStamp by CODE ?

let currentDate = new Date(); 
console.log("Current-Date: ", currentDate);

let currentTimeStamp = new Date(currentDate).getTime(); 
console.log("Current-Time-Stamp: ", currentTimeStamp);

…or more simple…

let currentTimeStamp = new Date().getTime();

You can get a Time-Stamp of every date you want like…

let currentTimeStamp = new Date("11.11.1970").getTime();

I think the rest is clear and understandable, you surely will be able to continue without further help, right now.

Good luck!

3

Ah, that makes sense. Thank you very much!

4

No problem!