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it recomended to use the builten function _DateDiff hello autoit team i made a simple function to help me get the difference between to date i liked to share it with you the paramatrs of this function is firstdate and lastedate the two params is as the following year/month/day hours:minuts:seconds here is the function #include <date.au3> func _dateBetween($s_firstDate, $s_lastDate = default) if not (StringRegExp($s_firstDate, "((\d{4})\/(\d{2})\/(\d{2})\s(\d{2})\:(\d{2})\:(\d{2}))", 0) = 1) then Return SetError(1, 0, 0) if $s_lastDate = default then $s_lastDate = @year & "/" & @mon & "/" & @mday & " " & @hour & ":" & @min & ":" & @sec if not (StringRegExp($s_lastDate, "((\d{4})\/(\d{2})\/(\d{2})\s(\d{2})\:(\d{2})\:(\d{2}))", 0) = 1) then Return SetError(2, 0, 0) local $a_FirstSplitDate = StringSplit(StringRegExpReplace($s_firstDate, "((.*)\s(.*))", "$2"), "/", 2) local $a_FirstSplitTime = StringSplit(StringRegExpReplace($s_firstDate, "((.*)\s(.*))", "$3"), ":", 2) local $a_lastSplitDate = StringSplit(StringRegExpReplace($s_lastDate, "((.*)\s(.*))", "$2"), "/", 2) local $a_LastSplitTime = StringSplit(StringRegExpReplace($s_lastDate, "((.*)\s(.*))", "$3"), ":", 2) local $i_firstDateValue = _DateToDayValue($a_FirstSplitDate[0], $a_FirstSplitDate[1], $a_FirstSplitDate[2]) local $i_LastDateValue = _DateToDayValue($a_LastSplitDate[0], $a_LastSplitDate[1], $a_LastSplitDate[2]) if $i_firstDateValue > $i_LastDateValue then Return SetError(3, 0, 0) local $i_totalDays = $i_LastDateValue-$i_firstDateValue if not ($i_totalDays = 0) then if $a_FirstSplitTime[0] <= $a_lastSplitTime[0] then $i_totalDays += 1 $a_lastSplitTime[0] -= $a_FirstSplitTime[0] elseIf $a_FirstSplitTime[0] > $a_lastSplitTime[0] then if $i_totalDays > 0 then $i_totalDays -= 1 $a_FirstSplitTime[0] -= $a_lastSplitTime[0] endIf endIf endIf local $i_totalYears = 0 if $i_totalDays >= 365 then While $i_totalDays >= 365 $i_totalYears += 1 $i_totalDays -= 365 Wend endIf local $i_TotalMonths = 0 if $i_totalDays >= 30 then While $i_totalDays >= 30 $i_totalMonths += 1 $i_totalDays -= 30 Wend endIf local $i_totalWeeks = 0 if $i_totalDays >= 7 then While $i_totalDays >= 7 $i_totalWeeks += 1 $i_totalDays -= 7 Wend endIf $i_totalSeconds = ((($a_FirstSplitTime[0]*60)*60)+($a_FirstSplitTime[1]*60)+($a_FirstSplitTime[2]))-((($a_lastSplitTime[0]*60)*60)+($a_lastSplitTime[1]*60)+($a_LastSplitTime[2])) local $minus = "" if $i_totalSeconds < 0 then $minus = "-" $i_totalSeconds = StringReplace($i_totalSeconds, "-", "") endIf local $i_totalHours = 0 if $i_totalSeconds >= 3600 then While $i_totalSeconds >= 3600 $i_totalHours += 1 $i_totalSeconds -= 3600 Wend endIf local $i_totalminuts = 0 if $i_totalSeconds >= 60 then While $i_totalSeconds >= 60 $i_totalminuts += 1 $i_totalSeconds -= 60 Wend endIf local $a_arrayReturn[7] $a_arrayReturn[0] = $i_totalYears $a_arrayReturn[1] = $i_totalMonths $a_arrayReturn[2] = $i_totalWeeks $a_arrayReturn[3] = $i_totalDays $a_arrayReturn[4] = $minus & $i_totalHours $a_arrayReturn[5] = $minus & $i_totalminuts $a_arrayReturn[6] = $minus & $i_totalSeconds return $a_arrayReturn endFunc here is an example $a_calc = _dateBetween("2015/02/12 23:00:05", "2030/02/12 23:25:50") msgBox(64, "result", StringFormat("the difference is : %i years and %i months and %i weeks and %i days and %i hours and %i minuts and %i seconds", $a_calc[0], $a_calc[1], $a_calc[2], $a_calc[3], $a_calc[4], $a_calc[5], $a_calc[6])) am waiting for your comments with my greetings