Templating a Date string - what am I missing?

Configuration
1

I need to craft a string that represent a date and time that along with a temp I need to send to my boiler to set a temporarily overridden temp setting.
Leaving the details aside I’m experimenting with the template editor in the dev tools

if I use this code to render the string (I’ll need to convert it to hex but that’s already solved)

{% set newtime=now()+timedelta(hours=states('input_number.temp_override_hours')|int) %}
{{  (states('input_number.temperature_override_temp') | float *10)|int }} {{  newtime.strftime('%H') }} {{  newtime.strftime('%M') }} {{  newtime.strftime('%S') }} {{  newtime.strftime('%d') }} {{  newtime.strftime('%m') }} {{  newtime.strftime('%Y') }}

the result is good (the input nr is now set to 1h offset):

215 23 51 00 11 02 2025

215 new temp setting (multiplied by 10 = 21.5°C)
23 51 00 time (+1h CET)
11 02 2025 date

but if I remove the spaces, placed here to help reading, the year goes back to 2024:

{% set newtime=now()+timedelta(hours=states('input_number.temp_override_hours')|int) %}
{{  (states('input_number.temperature_override_temp') | float *10)|int }}{{  newtime.strftime('%H') }}{{  newtime.strftime('%M') }}{{  newtime.strftime('%S') }}{{  newtime.strftime('%d') }}{{  newtime.strftime('%m') }}{{  newtime.strftime('%Y') }}

gives
21523581711022024

as this template render a number I though that there could be a rounding error of some kind but i I cast it to a string with something like this:

{% set newtime=now()+timedelta(hours=states('input_number.temp_override_hours')|int) %}
{{ ((states('input_number.temperature_override_temp') | float *10)|int|string + newtime.strftime('%H') +  newtime.strftime('%M') +  newtime.strftime('%S') +  newtime.strftime('%d') +  newtime.strftime('%m') +  newtime.strftime('%Y')) | string }}

result is also wrong.

21500030012022024

I know I’m missing something very stupid, can you point it to my dumb brain?

TY

2

well I kind of solved it, If I convert everything tho hex the result is good:

{% set newtime=now()+timedelta(hours=states('input_number.temp_override_hours')|int) %}
{{ ('%02x' % ((states('input_number.temperature_override_temp') | float *10)|int))| string + ('%02X' % newtime.strftime('%H')|int) + ('%02X' % newtime.strftime('%M')|int)+ ('%02X' % newtime.strftime('%S')|int)+ ('%02X' % newtime.strftime('%d')|int) + ('%02X' % newtime.strftime('%m')|int)+ ('%04X' % newtime.strftime('%Y')|int)}}

d70010000C0207E9
d7 = 215
00 = 00, midnight (now + 1h CET)
10 = 16
00 = 0 seconds
0C = 12 (tomorrow as is after midnight)
02 = 02/february
07E9 = 2025

strange…

3

Try this version.

{% set newtime = now() + timedelta(hours=states('input_number.temp_override_hours') | int(0)) %}
{{ (states('input_number.temperature_override_temp') | float(0) * 10) | int(0) }} {{ newtime.strftime('%H %M %S %d %m %Y') }}

Do you need the values in decimal or hexadecimal?

4

I’ll need the hex string as shown in the previous post as the boiler wants it that way. The hex string as I said is good.

With your tenplate the conversion is more difficult as i need to convert the pieces independently as the boiler needs every piece of the string temp,h,m,s,d,m,yyyy in hex values

5

There’s another way to do it but you’ve already found an acceptable solution so I won’t dwell on it.

{% set dt = now()+timedelta(hours=states('input_number.temp_override_hours')|int(0)) %}
{% set dt = dt.strftime('%H %M %S %d %m %Y').split()|map('int')|list %}
{% set t = (states('input_number.temperature_override_temp')|float(0)*10)|int(0) %}
{{'%02X%02X%02X%02X%02X%02X%04X' % tuple([t]+dt)}}