; Show_Date_Time_of_Boot_and_Elapsed_Time_Since_Boot.ahk
;
; Partly by Apollia of Astroblahhh.Com.  http://astroblahhh.com/
;
; Thanks to the AHK forum member "closed" for the FormatSeconds function,
; which I (Apollia) slightly modified.  I found it in boottime.zip 
; (in the file boottime.ahk) at: 
;
; http://www.autohotkey.com/forum/topic57396.html#351314
;
; If you want a clock that shows the elapsed time since boot and which
; updates in real time, you might like boottime.zip more than this script.
;
; --------------------------------------------------------
; 
; This is a simple script that displays a message box showing the approximate 
; date/time your computer booted and how many hours, minutes and seconds have 
; elapsed since then.  The elapsed time doesn't update.
;
; The times may be a little off - I'm not sure how to get rid of the 1 second 
; fluctuation that sometimes happens.  Sometimes, the date/time of booting 
; ends up being 1 second earlier or 1 second later than the time usually 
; displayed.


#NoEnv
#SingleInstance Force


; The FormatSeconds function is not by Apollia (though was slightly modified by 
; Apollia).
;
; It is by the AHK forum member "closed", and I (Apollia) found it in boottime.zip 
; (in the file boottime.ahk) at:
;
; http://www.autohotkey.com/forum/topic57396.html

FormatSeconds(NumberOfSeconds)  
{
    time = 19990101  
    time += %NumberOfSeconds%, seconds
    FormatTime, mmss, %time%, mm:ss
    return Floor(NumberOfSeconds//3600) ":" mmss   
}


DateFormat = ddd, M/d/yyyy h:mm:ss tt

Now_DateTime := A_Now

Boot_DateTime := Now_DateTime
	; Will later subtract Seconds_Since_Boot to get boot time.
	
Seconds_Since_Boot := A_TickCount / 1000
	;A_TickCount is a built-in variable containing milliseconds since boot.

Negative_Seconds_Since_Boot := 0 - Seconds_Since_Boot

EnvAdd, Boot_DateTime, Negative_Seconds_Since_Boot, Seconds

FormatTime, Formatted_Now_DateTime, %Now_DateTime%, %DateFormat%
FormatTime, Formatted_Boot_DateTime, %Boot_DateTime%, %DateFormat%

Hours_Mins_and_Secs_Since_Boot:=FormatSeconds(Seconds_Since_Boot)

MsgBox, (Times may be off by a sec or two)`n`nBoot Date/Time:`n`n	%Formatted_Boot_DateTime%`n`nElapsed time since boot:`n`n	%Hours_Mins_and_Secs_Since_Boot%`n`n(as of %Formatted_Now_DateTime%)

exit