'Dates in JavaScript are Broken. Who Shall Fix them?' javascript webdevelopment
function which was found to be buggy and problematic in Java, leaving it full of issues. You may have even encountered some issues yourself. You may be wondering, then, "what's so weird about it?". Let's look at all the quirks and common pitfalls with Javascript's Date constructor, so you can avoid them.
It sounds counterintuitive, given the main Javascript date constructor is called Date, but Javascript does not actually support dates. Javascript only supports date times. All Javascript dates are Unix timestamps underneath. That means if we try to create a date, we actually are creating alet date=new Date; // Notice the date produced has a time attached: // Tue Feb 22 2011 00:00:00 GMT+0000 Parsing dates as we did above works fine if you know months start at 0, but parsing date strings vary significantly across browsers. It is strongly advised to not parse date strings. Before the ECMAScript 5 specification, howparsed string dates was never defined, and different browsers have many historical quirks that make it very unreliable.should be parsable by Javascript, and any other dates should returnHowever, that is not the case. Many browsers allow date parsing outside of this format. This is where it has the potential to get confusing. Let's say you want to parse a date format in standardlet myDate=new Date; console.log;- meaning it returns May 1st, not Jan 5th, leading to unexpected results.Suppose you have a date which has no time or timezone associated with it:You might think there is nothing immediately confusing about this - it represents a fixed date in time. However:If your timezone is UTC+3:00, this will returnSo if your timezone is west of UTC, for example,That means if we try to use this timestamp with a different timezone, for example, in a backend system, we wouldn't get 1st Jan 1999, we get 31st Dec 1998! All of this is because Javascript does not implement dates - every date has a time associated with it - in this case, midnight.If we want to create a date in Javascript we can parse numbers representing year, month and day. For example, if we want to create a date for Feb 22nd, 2011, we'd write this, right?. That's because months in Javascript start counting from 0, so February is 1, not 2:Let's say you have accidentally created an incorrect date, say 31st Feb, 2022. You pass this into your date function, by mistake, from a database or API:, but you'd be wrong. Javascript skips to March 3rd! Since February only has 28 days in 2011, and there are 3 extra days, these days are added to the end of the month. In other words, you can't trustThe weirdest behavior of all is when we don't give Javascript entire strings in parse. For example:You might think that this will return the year 0, or perhaps the unix epoch, but it actually returns the year 2000 -Even more strangely, though, if we try to increase this, it starts counting in months: console.log); // Tue May 01 2001 00:00:00 GMT+0100 console.log); // Thu Nov 01 2001 00:00:00 GMT+0000 console.log); // Sun Apr 01 2001 00:00:00 GMT+0100
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