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Validate if a string is a Date

/ Published in: Groovy
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Returns true if the string 'value' is a valid date.

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  1. //Value parameter - required. All other parameters are optional.
  2. function isDate(value, sepVal, dayIdx, monthIdx, yearIdx) {
  3.     try {
  4.         value = value.replace(/-/g, "/").replace(/\./g, "/");
  5.         var SplitValue = value.split(sepVal || "/");
  6.         if (SplitValue.length != 3) {
  7.             return false;
  8.         }
  9.  
  10.         //Auto  detection of indexes
  11.         if (dayIdx === undefined || monthIdx === undefined || yearIdx === undefined) {
  12.             if (SplitValue[0] > 31) {
  13.                 yearIdx = 0;
  14.                 monthIdx = 1;
  15.                 dayIdx = 2;
  16.             } else {
  17.                 yearIdx = 2;
  18.                 monthIdx = 1;
  19.                 dayIdx = 0;
  20.             }
  21.         }
  22.  
  23.         //Change the below values to determine which format of date you wish to check. It is set to dd/mm/yyyy by default.
  24.         var DayIndex = dayIdx !== undefined ? dayIdx : 0;
  25.         var MonthIndex = monthIdx !== undefined ? monthIdx : 1;
  26.         var YearIndex = yearIdx !== undefined ? yearIdx : 2;
  27.  
  28.         var OK = true;
  29.         if (!(SplitValue[DayIndex].length == 1 || SplitValue[DayIndex].length == 2)) {
  30.             OK = false;
  31.         }
  32.         if (OK && !(SplitValue[MonthIndex].length == 1 || SplitValue[MonthIndex].length == 2)) {
  33.             OK = false;
  34.         }
  35.         if (OK && SplitValue[YearIndex].length != 4) {
  36.             OK = false;
  37.         }
  38.         if (OK) {
  39.             var Day = parseInt(SplitValue[DayIndex], 10);
  40.             var Month = parseInt(SplitValue[MonthIndex], 10);
  41.             var Year = parseInt(SplitValue[YearIndex], 10);
  42.             var MonthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  43.  
  44.             if (OK = (Month <= 12 && Month > 0)) {
  45.  
  46.                 var LeapYear = (((Year % 4) == 0) && ((Year % 100) != 0) || ((Year % 400) == 0));
  47.                 MonthDays[1] = (LeapYear ? 29 : 28);
  48.  
  49.                 OK = Day > 0 && Day <= MonthDays[Month - 1];
  50.             }
  51.         }
  52.         return OK;
  53.     }
  54.     catch (e) {
  55.         return false;
  56.     }
  57. }

URL: http://www.codeproject.com/Tips/144113/JavaScript-Date-Validation

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