http://snippets.dzone.com/posts Thu, 24 Jul 2008 08:06:06 GMT DZone Snippets: leap code http://snippets.dzone.com/posts/show/2204 <a href="http://jsfromhell.com/geral/is-date"> <br />Checks if a date is valid and returns error codes described bellow. <br /> <br />[UPDATED CODE AND HELP CAN BE FOUND HERE] <br /></a> <br /> <br /><code> <br />//+ Jonas Raoni Soares Silva <br />//@ http://jsfromhell.com/geral/is-date [v1.0] <br /> <br />isDate = function(y, m, d){ //v1.0 <br /> if(typeof y == "string" && m instanceof RegExp && d){ <br /> if(!m.test(y)) return 1; <br /> y = RegExp["$" + d.y], m = RegExp["$" + d.m], d = RegExp["$" + d.d]; <br /> } <br /> d = Math.abs(d) || 0, m = Math.abs(m) || 0, y = Math.abs(y) || 0; <br /> return arguments.length != 3 ? 1 : d < 1 || d > 31 ? 2 : m < 1 || m > 12 ? 3 : /4|6|9|11/.test(m) && d == 31 ? 4 <br /> : m == 2 && (d > ((y = !(y % 4) && (y % 1e2) || !(y % 4e2)) ? 29 : 28)) ? 5 + !!y : 0; <br />}; <br /></code> <br /> <br />Usage <br /><code> <br /><script type="text/javascript"> <br /> <br />getDateMsg = function(x){ <br /> return x == 0 ? "Valid Date" <br /> : x == 1 ? "Invalid date format" <br /> : x == 2 ? "Invalid day" <br /> : x == 3 ? "Invalid month" <br /> : x == 4 ? "In April, June, September and November there's no 31 day" <br /> : x == 5 ? "February has only 28 days" <br /> : x == 6 ? "In leap years, February has 29 days": "nothing =]"; <br />}; <br /> <br />var x = [ <br /> isDate("22/07/1984", /^([0-9]{1,2})[\/]([0-9]{1,2})[\/]([0-9]{1,4})$/, {d: 1, m: 2, y: 3}), <br /> isDate("1984-07-22", /^([0-9]{4})-([0-9]{2})-([0-9]{2})$/, {d: 3, m: 2, y: 1}), <br /> isDate("07-22-1984", /^([0-9]{4})-([0-9]{2})-([0-9]{2})$/, {d: 3, m: 2, y: 1}), <br /> isDate(2000, 1, 32), <br /> isDate(2000, 0, 1), <br /> isDate(2000, 4, 31), <br /> isDate(2001, 2, 29), <br /> isDate(2004, 2, 30) <br />]; <br /> <br />for(var i = -1, l = x.length; ++i < l; document.write(getDateMsg(x[i]), "<br />")); <br /> <br /></script> <br /></code> <br /> <br />Help <br /><code> <br />isDate(y: Integer, m: Integer, d: Integer): Integer <br /> Checks a date and returns 0 if it's valid or one of the error codes bellow. <br /> y year <br /> m month <br /> d day <br /> <br /> <br />isDate(date: String, matcher: RegExp, map: Object): Integer <br /> Checks a date and returns 0 if it's valid or one of the error codes bellow. <br /> date date in a string form <br /> matcher regular expression responsible to find and store the day, month and year <br /> <br /> map object containing the position where each date component is localized inside the regular expression. Its format is the following: {d: positionOfTheDay, m: positionOfTheMonth, y: positionOfTheYear} <br />Return codes <br /> * 0 = Valid date <br /> * 1 = Date format invalid (regular expression failed or amount of arguments != 3) <br /> * 2 = Day isn't between 1 and 31 <br /> * 3 = Month isn't between 1 and 12 <br /> * 4 = On April, June, September and November there isn't the day 31 <br /> * 5 = On February the month has only 28 days <br /> * 6 = Leap year, February has only 29 days <br /></code> Thu, 15 Jun 2006 20:12:01 GMT http://snippets.dzone.com/posts/show/2204 jonasraoni (Jonas Raoni Soares Silva)