test := TimeFormatHMS(%InputBoxContents%, h, m, s)

Gui, Add, Edit, x2 y149 w80 h20 vInputBoxContents, 1200000
Gui, Add, Text, vVar, %test%
Gui, Add, Button, gSubmit, SUBMIT
Gui, Show, w404 h464, Auto Update Text String parsed from milisecond-based editbox (convert to hours, minutes, seconds)
Return


Submit:
Gui, Submit, NoHide
MsgBox, This is the variable contents directly from the editbox: %InputBoxContents%
test2 := TimeFormatHMS(%InputBoxContents%, h, m, s)
MsgBox, This is the variable contents that the text label (based on editbox input piped through the TimeFormat Function below) has: %test2%
GuiControl, Text, Var, %test2%
Gui, Submit, NoHide
Return


TimeFormatHMS(milli, ByRef hours=0, ByRef mins=0, ByRef secs=0, secPercision=0)
{
Gui, Submit, NoHide
SetFormat, FLOAT, 0.%secPercision%
milli /= 1000.0
secs := mod(milli, 60)
SetFormat, FLOAT, 0.0
milli //= 60
mins := mod(milli, 60)
hours := milli //60
return hours . ":" . mins . ":" . secs
}

GuiClose:
ExitApp