DateDiff

;
; Inspired by: http://www.donationcoder.com/forum/index.php?topic=10149.msg78302#msg78302
; Last Updated:

#Persistent
#SingleInstance, Force
#NoEnv
;#NoTrayIcon

SetBatchLines, -1
SetTitleMatchMode, 2        ; partial match
SetWorkingDir, %A_ScriptDir%
SendMode, Input
DetectHiddenWindows, Off    ; they're hidden for a reason.

appname = DateDiff
appicon = %appname%.ico
; Menu stuff
If Not A_IsCompiled
  IfExist, %A_ScriptDir%\%appicon%
    Menu, Tray, Icon, %A_ScriptDir%\%appicon%

Gui, Add, MonthCal, vDayStart
Gui, Add, Button, Default, Check
Gui, Add, Text, xp+50 yp+5 w150 vDateDiffText, ;test ;blank at first
Gui, Add, MonthCal, xs vDayEnd
Gui, Show,, %appname%
Return

ButtonCheck:
Gui, Submit, NoHide
;FormatTime, DayPick, %DayStart%, MMMM d, yyyy
;Send, %DayStart%
EnvSub, DayEnd, %DayStart%, days
If DayEnd = 0
  {
  ;GuiControl, , DateDiffText, DateDiff: %DayEnd%
  GuiControl, , DateDiffText, % "There is " . DayEnd . " difference."
  ;MsgBox % "There is " . DayEnd . " difference."
  }
Else If DayEnd <> 1
  {
  GuiControl, , DateDiffText, % DayEnd . " days."
  ;MsgBox % DayEnd . " days."
  }
Else
  {
  GuiControl, , DateDiffText, % DayEnd . " day."
  ;MsgBox % DayEnd . " day."
  }
Return

GuiClose:
GuiEscape:
ExitApp
Return