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Validate a date string #JavaScript
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| // Validates whether the given date string is in MM/DD/YYYY format, and if it is a valid date. | |
| var isValidDate = function (dateString) { | |
| // Validate the date string for the format via regular expressions. In this case it is MM/DD/YYYY | |
| var dateRegEx = new RegExp('^(0?[1-9]|1[012])/(0?[1-9]|[12][0-9]|3[01])/((19|20)\\d\\d)$' ); // Date Format: MM/DD/YYYY | |
| if (dateRegEx.test(dateString)) { | |
| var dateTokens = dateString.split('/' ); | |
| var timestamp = Date.parse(dateString); | |
| // Parsing the date in javascript into the no. of milliseconds since Jan 1, 1970 is | |
| // an added line of defense to check whether the date format is correct. | |
| if (!isNaN(timestamp)) { | |
| // Date.parse() parses a date string even if it is logically incorrect. | |
| // e.g. When you parse Feb 30, 2013, it gives you milliseconds till Mar 2, 2013 without any errors. | |
| // Here comes the one-to-one checking of the actual month, day and year literals. | |
| var date = new Date(dateString); | |
| if (parseInt(date.getMonth(), 10) + 1 === parseInt(dateTokens[0], 10) | |
| && parseInt(date.getDate(), 10) === parseInt(dateTokens[1], 10) | |
| && parseInt(date.getYear(), 10) === parseInt(dateTokens[2], 10)) { | |
| return true ; | |
| } | |
| } | |
| } | |
| return false; | |
| }; |
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