Fast RFC 3339 date processing in javascript
At Motionbox, we use a RFC 3339 time format in some data we return. Javascript doesn't natively handle this format with Date.parse. The only other blog post I've seen on the subject is this:
http://dansnetwork.com/2008/11/01/javascript-iso8601rfc3339-date-parser/
However, since that's a regular expression that's parsing on the string, it can sometimes be slower (but not toooo bad... 1000 iterations on the code from the blog post above took < 100 miliseconds in IE7 (~40 miliseconds in Firefox on a macbook pro).
I knew we could do better with splits. With my code below I got it operating 60% faster (so operations take 40% of the time from the code above).
JavaScript:
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Date.prototype.setRFC3339 = function(dString){
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var utcOffset, offsetSplitChar;
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var offsetMultiplier = 1;
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var dateTime = dString.split("T");
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var date = dateTime[0].split("-");
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var time = dateTime[1].split(":");
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var offsetField = time[time.length - 1];
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var offsetString;
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offsetFieldIdentifier = offsetField.charAt(offsetField.length - 1);
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if (offsetFieldIdentifier == "Z") {
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utcOffset = 0;
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time[time.length - 1] = offsetField.substr(0, offsetField.length - 2);
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} else {
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if (offsetField[offsetField.length - 1].indexOf("+") != -1) {
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offsetSplitChar = "+";
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offsetMultiplier = 1;
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} else {
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offsetSplitChar = "-";
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offsetMultiplier = -1;
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}
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offsetString = offsetField.split(offsetSplitChar);
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time[time.length - 1] == offsetString[0];
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offsetString = offsetString[1].split(":");
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utcOffset = (offsetString[0] * 60) + offsetString[1];
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utcOffset = utcOffset * 60 * 1000;
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}
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this.setTime(Date.UTC(date[0], date[1] - 1, date[2], time[0], time[1], time[2]) + (utcOffset * offsetMultiplier ));
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return this;
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};
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