Heating switch harmonogram

[michass]

Hi,
This is my first post
I Have EQ-3 MAX! Cube and one radiator thermostat at the moment.
I use PHP script to control this system.
I have harmonogram to control temperature switching.

2018-04-09 09_38_52-Domoticz.png (19.68 KiB) Viewed 755 times

But Comfort temp start erlier than it should.
It's happened, when i want to switch from lower to higher temp and not each time.
Is there some extra hidden algoritm to start sooner for rise temp, that should be target temp reached on time?
Or maybe I have some typo bug in time field?
Thanks in advance.
BR
Michał