Domoticz

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-- uservariables["Wecker_Uhrzeit"] is the alarm time which I set from my smart phone. It's a user time variable holding a string in the format HH:MM.
-- Dimmer_Dauer is the number of minutes I want the wake up process to start before my alarm rings.

commandArray = {}
local Dimmer_Dauer=25 -- Set dimming duration to 25 Minutes
local Hour=string.sub(uservariables["Wecker_Uhrzeit"],1,2); -- Here it gets funny: The string holding the alarm time has to be decomposed into hours and minutes. Here I extract the hours by taking the first two etrys of the string into the local variable Hour
local Minute=string.sub(uservariables["Wecker_Uhrzeit"],4,5);  -- Here I extract the minutes by taking the third and fourth etry of the string into the local variable Minute.
local Wecker_Sekunden=os.time{year=1970, month=1, day=1, hour=tonumber(Hour), min=tonumber(Minute)}; --here there strigs with the extracted hours and minutes have to converted into numbers and then into seconds, which I find really funny. This is done by the os.time function. The year, month and day don't matter at all, because after the following math I only extract the hour and minute again. They have to be defined however.
local WakeUp_Sekunden=Wecker_Sekunden-Dimmer_Dauer*60; -- This is the part which does what I intentionally wanted to do. Substracting the duration of the dimming from my alarm time. The local variable WakeUp_Sekunden now holds the desired beginning of the wake up process as a number of seconds from the date defined in the os.time function above.
local WakeUp_Beginn=tostring(os.date("%H:%M",WakeUp_Sekunden)); --the os.date function transforms the desired wake up time from seconds back to a string in the format HH:MM. This is done by choosing only hours and minutes through the %H, the : and the %M.
commandArray['Variable:WakeUp_Beginn']=WakeUp_Beginn; --This updates my user variable which blockly uses to start the wake up process.
return commandArray

-- google about os.time and os.date if you have trouble understanding what these functions do.