Date / Time calculation runtime/duration between events

[Krentzel_GmbH]

Hello AI2-friends,
I have been “tinkering” a function with the App Inventor for days now and am not able to reach my goal.
I want to calculate the running time in months, days, hours, minutes between two events.
Example:

1. After pressing the “Start” button, the current date + time is saved in Tiny-DB Tag “x”.
2. I press the “Stop” button later and the current date + time is saved in Tiny-Db Tag “y”.
3. After pressing the “Calculate” button, I would like to display the running time of the event in months, days, hours, minutes and save it in Tiny-DB Tag “Z”.

Could someone give a tip on how I can best do this?

[TIMAI2]

Did you do a search ? "duration"

Issue with clock duration

Hello, I do a simple test: I click on the initTemp button to copy the system time When I click on LAP, I want to have the difference between the current time and the saved time. I don’t understand why App Inventor systematically puts 1 hour when it’s good for minutes and seconds? For example I have 01:01:02 instead of 00:01:02 when I have well 62 s elapsed ??? [blocks (12)] Despite my readings, I cannot clarify this point … if you have an idea? thank you in advance Ced

Countdown Dates

Just use the datepickers to select the start and end dates. In the datepicker blockers you will find “instant from datepicker” - use this for the durations.

You should find what you need in these two links

[Krentzel_GmbH]

Hi and many thanks for reply,
a. in the the screen we have only a button (or a global-variabel) and not a datepicker or time-picker.
b. in the block of date-picker are not the hours and minutes we need for the duration-calculation.

Is that the right solution for me with the date picker?
Do you have an example APK, that I can convert myself?

Sorry, I’m still a beginner …but it’s a lot of fun with the AI2

[TIMAI2]

It doesn’t matter where the date/time instants come from - clock, datepicker, the method for finding the duration between instants is the same

[Krentzel_GmbH]

Hi again,
sorry, but i find not the mistake in my application.
The hours, minutes and seconds are not schown right (red-label):

[TIMAI2]

Well, what you are returning for each time duration is “correct”, but you are getting the total shown for each one.

You will have to do some more work on the calculations to work out the days, then remove that amount, then the hours, remove that amount, then the minutes.

If you look at Taifun’s example in the link I provided above, he shows how to do this using milliseconds, and the quotient/remainder maths blocks

[Anke]

@Krentzel_GmbH

The hours, minutes and seconds are not schown right

Try something like this:

[Krentzel_GmbH]

Hi…yes, i have modifyd the AIA from Taifun for my app …its work great !!!
Many Thanks and bye bye from Germany

[Krentzel_GmbH]

Danke Anke… und Tschüss aus Bremen …