# Help calculating end time based on minutes left
**URL:** https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944
**Category:** Questions & Help
**Created:** [March 17, 2025, 8:38pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944 "2025-03-17T20:38:09Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@Skorpion](https://community.homey.app/u/Skorpion)
#### Post date: [March 17, 2025, 8:38pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/1 "2025-03-17T20:38:09Z")
Hi,
I’ve been breaking my head over this a couple of nights now, but I don’t know how to get this done so I hope someone can help me out.
Goal:
My dryer and washing machine (using the Bosch Home Connect app) have a tag available with “minutes left” (string, format mm:ss) that indicates when the current program is finished. My goal is to calculate the end time of the program using the remaining time from the current time.
For example: The current time is 15:00, remaining time is 30:00. I want to calculate the end time, in this case 15:30.
I’ve been trying with Homeyscript, but if I’m correct, I can’t read tag/variable values in the script.
My guess is I need to use BLL for this, but I don’t know what to do.
Hoping someone can help me in the right direction!
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### Author:  [@Marius\_Stensrod](https://community.homey.app/u/Marius_Stensrod)
#### Post date: [March 18, 2025, 5:38pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/3 "2025-03-18T17:38:31Z")
I would suggest to ignore the seconds part from your dryer/washer. Make a flow, that extract the first part of the variable like this:
(You can use the standard logical card, just get the format right)
Divide the result by 60.
Extract time from now-time variabel, use the whole number value from your previous calculation, add that to the hour time you just extracted.
from your calculation, you got a value after the desimal point, that is the minute part. 60\*result gives you minutes. Add that to now-time variabel. After calculation, run it in to a “all” block, then set the time hours and minutes.
You have to make “failsafe” function so you do not exceeed 24 hours and exceed 60 minutes.
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### Author:  [@Rmb](https://community.homey.app/u/Rmb)
#### Post date: [March 18, 2025, 7:22pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/4 "2025-03-18T19:22:18Z")
> [@Marius\_Stensrod](#):
>
> You have to make “failsafe” function so you do not exceeed 24 hours and exceed 60 minutes
If you do your calculations in epoche date and time, that is not a problem. It is supported by BLL.
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### Author:  [@Skorpion](https://community.homey.app/u/Skorpion)
#### Post date: [March 18, 2025, 9:42pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/5 "2025-03-18T21:42:31Z")
Thanks a lot! This works. 😃 I don’t have the failsafe yet though.
@Rmb, I’ll have to look into this. Does this mean that the hours and minutes I extracted in the example of @Marius_Stensrod I all have to convert to milliseconds to use the BLL flow card for epoch?
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### Author:  [@Rmb](https://community.homey.app/u/Rmb)
#### Post date: [March 18, 2025, 11:26pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/6 "2025-03-18T23:26:27Z")
Yes, to set the endtime 1 hour and 30 minutes later after the current time, use BLL card “set variable to BLL expression “, using the expression
`date('shorttime', Date.now() + (90*60000) )`
Or
`date('hh:mm', Date.now() + (90*60000) )`
Which does the same format.
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### Author:  [@Skorpion](https://community.homey.app/u/Skorpion)
#### Post date: [March 19, 2025, 7:35pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/7 "2025-03-19T19:35:51Z")
@Marius_Stensrod @Rmb Thanks to you both! This did the trick:
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### Author:  [@Marius\_Stensrod](https://community.homey.app/u/Marius_Stensrod)
#### Post date: [March 19, 2025, 9:12pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/9 "2025-03-19T21:12:17Z")
Am I missing something? I do not see that this is Epoch(Unix) time.
And you can remove the number 24 after HH, it should be HH:mm to get the time now with 24hour timestamp.
For Unix time, you can just write “now” in the BLL card, without the quotes. If I understand correctly when it is talking about Epoch time.
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### Author:  [@Rmb](https://community.homey.app/u/Rmb)
#### Post date: [March 19, 2025, 10:57pm UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/10 "2025-03-19T22:57:34Z")
See [[APP][Pro] Better Logic Library - For Users - #185 by Arie\_J\_Godschalk](https://community.homey.app/t/app-pro-better-logic-library-for-users/71876/185)
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### Author:  [@Skorpion](https://community.homey.app/u/Skorpion)
#### Post date: [March 20, 2025, 6:42am UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/11 "2025-03-20T06:42:54Z")
The usage of hh returned a 12h time for me, hence the usage of HH24. Could be that HH returns the same result as HH24. Will check tonight.
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### Author:  [@Rmb](https://community.homey.app/u/Rmb)
#### Post date: [March 20, 2025, 8:19am UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/12 "2025-03-20T08:19:42Z")
When you open de BLL app settings you get all the available formats.
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### Author:  [@Arie\_J\_Godschalk](https://community.homey.app/u/Arie_J_Godschalk)
#### Post date: [May 1, 2025, 8:17am UTC](https://community.homey.app/t/help-calculating-end-time-based-on-minutes-left/132944/13 "2025-05-01T08:17:12Z")
Actually, HH and HH24 are not the same.
30 minutes past midnight with HH will show 00:30, while with HH24 will show 24u30 (some countries write time like that).