Elapsed time conversion in template

Configuration
1

Hi,
I have sensor.truenas_uptime which returns time of last boot as 2022-04-11T19:59:15+01:00

I would like to convert this into a string that counts how much time elapsed since, i.e. something like 5 days, 16:58:34.

So far I managed to convert it to seconds (I think) with

{{ (as_timestamp(now()) | int) - ((as_timestamp(strptime(states('sensor.truenas_uptime'), '%Y-%m-%dT%H:%M:%S+00:00'))) | int) }}

but can’t figure out how to go from there.

Any advice welcome, thanks!

2

Copy-paste this into the template editor:

{{ now() - states('sensor.truenas_uptime') | as_datetime }}

It will report the time difference in a format you might find acceptable. If it’s not how you want to see it, let me know the exact way you want the time difference to be presented.

3

Thanks, that’s 99% of what I want, it gives 4 days, 21:42:58.134227 and all I’d like now is to get rid of the decimal point and everything after.

4

This converts the result into a string and then slices off the last 7 characters.


{{ ((now() - states('sensor.truenas_uptime') | as_datetime) | string)[:-7] }}
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