JavaScript Date Objects
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I wear a lot of hats... Examples might be simplified to improve reading and basic understanding. But they can be easily remembered when categorized.
Using getTime is so much faster! The source for this interactive example is stored in a GitHub repository. We need to use milliseconds in order to calculate the difference between today's and yesterday's date.
JavaScript Date Objects - Browser compatibility The compatibility table in this page is generated from structured data.
We can always create a date from a timestamp using new Date timestamp and convert the existing Date object to a timestamp using the date. Only two first arguments are obligatory. But they can be easily remembered when categorized. Get the year 4 digits Get the month, from 0 to 11. Get the day of month, from 1 to 31, the name of the method does look a little bit strange. Many JavaScript engines implement a non-standard method getYear. This method is deprecated. It returns 2-digit year sometimes. Please never use it. There is getFullYear for the year. Additionally, we can get a day of week: Get the day of week, from 0 Sunday to 6 Saturday. All the methods above return the components relative to the local time zone. There are also their UTC-counterparts, that return day, month, year and so on for the time zone UTC+0: , ,. As we can see, some methods can set multiple components at once, for example setHours. The components that are not mentioned are not modified. The autocorrection is a very handy feature of Date objects. We can set out-of-range values, and it will auto-adjust itself. Out-of-range date components are distributed automatically. Just add 2 days. It is semantically equivalent to new Date. It is used mostly for convenience or when performance matters, like in games in JavaScript or other specialized applications. Their result is always the same. So, which one is faster? The first idea may be to run them many times in a row and measure the time difference. For our case, functions are very simple, so we have to do it around 100000 times. Using getTime is so much faster! Okay, we have something. Imagine that at the time of running bench diffSubtract CPU was doing something in parallel, and it was taking resources. And by the time of running bench diffGetTime the work has finished. A pretty real scenario for a modern multi-process OS. As a result, the first benchmark will have less CPU resources than the second. That may lead to wrong results. For more reliable benchmarking, the whole pack of benchmarks should be rerun multiple times. So, in the example above, first executions are not well-optimized. We may want to add a heat-up run: Modern JavaScript engines perform many optimizations. So if you seriously want to understand performance, then please study how the JavaScript engine works. The great pack of articles about V8 can be found at. The method can read a date from a string. The string format should be: YYYY-MM-DDTHH:mm:ss. A single letter Z that would mean UTC+0. Shorter variants are also possible, like YYYY-MM-DD or YYYY-MM or even YYYY. The call to Date. If the format is invalid, returns NaN. Note that unlike many other systems, timestamps in JavaScript are in milliseconds, not in seconds. Also, sometimes we need more precise time measurements. JavaScript itself does not have a way to measure time in microseconds 1 millionth of a second , but most environments provide it. JS has microtime module and other ways. We may want to treat such days separately.
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Additionally, we can get a day of week: Get the day of week, from 0 Sunday to 6 Saturday. And by the time of running con diffGetTime the work has finished. Examples Using getDate The second statement below assigns the value 25 to the variable day, based on the value of the object Xmas95. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all con. I generally surf snippet repositories when I'm looking for some code that might be useful for my work projects. For our case, functions are very simple, so we have to do it around 100000 times. date yesterday javascript The method can read a date from a string. Get answers and train to solve all your tech problems - anytime, anywhere.
