Checking Date format from a string in C

Question

I want to check whether a string contains dates such as 1 01 2000 and 10 01 2000 in  dd MM yyyy format   So far I have tried this   DateTime dDate   DateTime Parse inputString   string Format   0 d MM yyyy    dDate      But how can I check if that format is correct to throw an exception

User · Answer

Try this  DateTime dDate  dDate   DateTime TryParse inputString   String Format   0 d MM yyyy    dDate      see this link for more info  http   msdn microsoft com en-us library ch92fbc1 aspx

User · Answer

you can use DateTime ParseExact with the format string  DateTime dt   DateTime ParseExact inputString  formatString  System Globalization CultureInfo InvariantCulture     Above will throw an exception if the given string not in given format    use DateTime TryParseExact if you don t need exception in case of format incorrect but you can check the return value of that method to identify whether parsing value success or not   check Custom Date and Time Format Strings

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Use an array of valid dates format  check docs   string   formats      d MM yyyy    dd MM yyyy     DateTime parsedDate  var isValidFormat  DateTime TryParseExact inputString  formats  new CultureInfo  en-US    DateTimeStyles None  out parsedDate    if isValidFormat        string Format   0 d MM yyyy    parsedDate     else          maybe throw an Exception

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I think one of the solutions is to use DateTime ParseExact or DateTime TryParseExact  DateTime ParseExact dateString  format  provider     source  http   msdn microsoft com en-us library w2sa9yss aspx

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you could always try   Regex r   new Regex    d 2   d 2   d 4      r isMatch inputString     this will check that the string is in the format  02 02 2002  you may need a bit more if you want to ensure that it is a valid date like dd mm yyyy

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string inputString    2000-02-02   DateTime dDate   if  DateTime TryParse inputString  out dDate         String Format   0 d MM yyyy    dDate      else       Console WriteLine  Invalid        lt -- Control flow goes here

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You can use below IsValidDate       public static bool IsValidDate string value  string   dateFormats                DateTime tempDate          bool validDate   DateTime TryParseExact value  dateFormats  DateTimeFormatInfo InvariantInfo  DateTimeStyles None  ref tempDate           if  validDate              return true          else             return false          And you can pass in the value and date formats  For example   var data    02-08-2019   var dateFormats     dd MM yyyy    dd-MM-yyyy    dd MM yyyy    if  IsValidDate data  dateFormats           Do something   else         Do something else

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https   msdn microsoft com es-es library h9b85w22 v vs 110  aspx  string   formats    M d yyyy h mm ss tt    M d yyyy h mm tt                          MM dd yyyy hh mm ss    M d yyyy h mm ss                          M d yyyy hh mm tt    M d yyyy hh tt                          M d yyyy h mm    M d yyyy h mm                          MM dd yyyy hh mm    M dd yyyy hh mm      string   dateStrings     5 1 2009 6 32 PM    05 01 2009 6 32 05 PM                               5 1 2009 6 32 00    05 01 2009 06 32                               05 01 2009 06 32 00 PM    05 01 2009 06 32 00       DateTime dateValue     foreach  string dateString in dateStrings           if  DateTime TryParseExact dateString  formats                                   new CultureInfo  en-US                                     DateTimeStyles None                                   out dateValue           Console WriteLine  Converted   0   to  1     dateString  dateValue        else         Console WriteLine  Unable to convert   0   to a date    dateString

[c#] Checking Date format from a string in C#

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