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Flexible JavaScript Date Validation w/ Regex

/ Published in: JavaScript
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Find the date with or without a year and with double or single digit month or day. Easily extendable to other date delimiters and formats.

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  1. // Validates date inputs
  2. function isDate(dateStr, testYear) {
  3. 	var dateObj;
  4. 	var	dateStamp;
  5. 	var	day;
  6. 	var	month;
  7. 	var year;
  8. 	var dateRegex;
  9.  
  10. 	// Set regex pattern based to test for year or not.
  11. 	if(testYear === undefined || testYear == true) {
  12. 		testYear = true;
  13. 		dateRegex = /^([0-9]{1,2})\/([0-9]{1,2})\/([0-9]{4})$/.exec(dateStr);
  14. 	} else {
  15. 		testYear = false;
  16. 		dateRegex = /^([0-9]{1,2})\/([0-9]{1,2})$/.exec(dateStr);
  17. 	}
  18.  
  19. 	// Validate string.
  20. 	if(dateRegex == null) {
  21. 		return false;
  22. 	}
  23.  
  24. 	// Get day, month, and year if testYear selected (or by default).
  25. 	month = parseInt(dateRegex[0]) - 1; // Subtract 1 because JS dates are 0-11.
  26. 	day = parseInt(dateRegex[1]);
  27. 	if(testYear) {
  28. 		year = parseInt(dateRegex[2]);
  29. 	} else {
  30. 		year = 1999; // This is arbitrary so long as it isn't a leap year.
  31. 	}
  32.  
  33. 	// Create dateObj.
  34. 	dateStamp = (new Date(year, month, day)).getTime();
  35. 	dateObj = new Date();
  36. 	dateObj.setTime(dateStamp);
  37.  
  38. 	// Validate date.
  39. 	if (dateObj.getMonth() !== month ||	dateObj.getDate() !== day || dateObj.getYear() !== year) {
  40. 		return false;
  41. 	}
  42.  
  43. 	return true;
  44. }

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