Day counting sensor

1

Hello everyone,

I have this as a sensor, it counts the days since the last battery change. It gets the date from a date / time selection helper.

  sensors:
    days_since_change:
      value_template: '{{ (((as_timestamp(now())-states.input_datetime.last_battery.attributes.timestamp)) | int /60/1440) | round(0) }}'
      friendly_name: "Days since last battery change"
      entity_id: input_datetime.last_battery

It works and it counts the days since the date input. Problem is that I find I have to toggle the input date selector for the day count to be updated.

Is there something I can put in an automation so I don’t have to do that and the days count is automatically updated and displayed?

Thanks.

1 Like
2

Have you tried input number? You can have an automation increment it every day at a particular time.

3

How would that work with the date input?

4

But it’s just a number you want as output?
So instead of writing the date you changed the battery, reset the counter.

5

Agreed… you could set up automation to increment the count every day and reset the count when the battery changes

6

Thanks guys, I really wanted to note the input date as well and have it displayed on a lovelace card and have the number of days calculated off that.

Could I assign the value from the sensor I’ve set up to a number and then increment that? I have a few of these I’d need to setup. Just seems a messy way to go about it, would be better if I could just update directly off the date I set.

7

Hello,

Just in case anyone is looking for a solution to this. I used the homeassistant.update_entitiy service, specified the appropriate template sensors as entity_ids and ran it via an overnight automation. All good.

Thanks to those that took the time to respond.