Template warning: 'strptime' got invalid input

Configuration
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1

Hello there,

I’m using strptime to report on the last_changed time of an entity. I’m getting a lot of these entries in my log (manually formatted for your viewing pleasure):

2022-03-01 17:54:22 WARNING (MainThread) [homeassistant.helpers.template]
Template warning: 'strptime' got invalid input '2022-03-01 05:22:51.684293+00:00' when rendering template
'{% set value = states.binary_sensor.kitchen_motion_motion.last_changed %}
 {% set last_updated = as_timestamp(strptime(value, "%Y-%m-%d %H:%M:%S.%f%z")) %}
 {% set seconds = (now().timestamp() - last_updated) | round(0) %}
 {{ seconds }}'
but no default was specified.
Currently 'strptime' will return '2022-03-01 05:22:51.684293+00:00', however
this template will fail to render in Home Assistant core 2022.1

There are many similar entries.

This seems like a mismatch between the date (in this case 2022-03-01 05:22:51.684293+00:00 and the strptime format ("%Y-%m-%d %H:%M:%S.%f%z") but I just can’t spot where the problem is.

In fact, running this in python by importing datetime and using datetime.datetime.strptime() with this exact date string and format works perfectly.

Any ideas?

2

The strptime function expects to receive a string to convert to a datetime object. However, last_changed contains a datetime object, not a string.

Copy-paste the following template into the Template Editor and you’ll see it reports elapsed time in seconds.

{{ (now() - states.binary_sensor.kitchen_motion_motion.last_changed).total_seconds() | round(0) }}
3

Ah, that makes perfect sense. I wondered myself why last_changed wasn’t a datetime object, but being a noob in homeassistant, I decided to trust other people’s code… :slight_smile:

I’ll test it and report back (but it makes all the sense that it should work).

Thanks.