How to convert the "sensor.phone_next_alarm" output into a friendly format?

Configuration
1

I want to create a card that will show me the day, time and date of the next alarm on my phone.
If I use a sensor card with the “sensor.phone_next_alarm” entity, I get a card showing “2021-05-02T21:43:00.000Z”, which is ugly and unreadable.

How can I turn that into a user friendly “day, HH:MM, DD.MM.YYYY” format?

I’ve looked around and the solution seems to be to use a template to do the conversion and then use that template as the entity, in my card.
Problem is, the only other threads I can find are tangentially related, at best, and all of them assume pro knowledge on using HA.
I’m a noob, I just managed to install HA on a raspberry, a few days ago. I’m still looking for HA’s off button.

Could someone please show me, in a noob friendly way, how to get this done?

2

Hi,

maybe it’s more a question of finding the right topic page in that really huge HA documentation. :slightly_smiling_face:

Have you set your time zone in settings → general → time zone?

3

Time zone is irrelevant for my need.
Also, I was unable to find the right topic page, hence this post asking for help.