Common function

/// Is the date format correct?

///

#Region Public String IsdateFormat (String StRDATE)

Public string isdateFormat (String strdate)

{

STRDATE = strdate.trim ();

Regex r1 = new regex (@ "^ (? [1-9] [0-9] {0,3}) / (? [0-9] {1, 2}) / (? [0-9] {1, 2}) $ ");

Regex r2 = new regex (@ "^ (? [1-9] [0-9] {0,3}) - (? [0-9] {1, 2}) - (? [0-9] {1, 2}) $ ");

Regex R3 = New Regex (@ "^ (? [1-9] [0-9] {0,3}) year (? [0-9] {1, 2}) month (? [0-9] {1, 2}) Day $ ");

Regex R4 = New Regex (@ "^ (? [0-9] {1, 2}) / (? [0-9] {1, 2}) / (? [1 -9] [0-9] {0,3}) $ ");

// Year, month, day

String year, month, date;

IF (regex.ismatch (@ "^ (? [0-9] {1, 2}) / (? [0-9] {1, 2}) / (? [1-9] [0-9] {3}) $ "))

{

Year = r4.match (strdate) .result ("$ {year}");

Month = r4.match (strdate) .result ("$ {month}");

Date = r4.match (strdate) .Result ("$ {day}");

}

Else IF (regex.ismatch (@ "^ (? [1-9] [0-9] {0,3}) / (? [0-9] {1,2}) / (? [0-9] {1, 2}) $ "))

{

Year = r1.match (strdate) .result ("$ {year}");

Month = r1.match (strdate) .result ("$ {month}");

Date = r1.match (strdate) .Result ("$ {day}");

}

Else IF (regex.ismatch (@ "^ (? [1-9] [0-9] {0,3}) - (? [0-9] {1,2}) - (? [0-9] {1, 2}) $ "))

{

Year = r2.match (strdate) .result ("$ {year}");

Month = r2.match (strdate) .Result ("$ {month}");

Date = r2.match (strdate) .Result ("$ {day}");

}

Else if (stradate, @ "^ (? [1-9] [0-9] {0,3}) year (? [0-9] {1,2}) Month (? [0-9] {1, 2}) day $ ")) {

Year = r3.match (strdate) .result ("$ {year}");

Month = r3.match (strdate) .result ("$ {month}");

Date = r3.match (strdate) .Result ("$ {day}");

}

Else

{

Return "Error";

}

// Last check of the date of the date

Try

{

System.datetime DT = New DateTime (Convert.Toint32 (Year), Convert.Toint32 (Month), Convert.Toint32 (Date);

Return Dt.toString ("YYYY-MM-DD");

}

Catch

{

Return "Error";

}

}

#ndregion

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