New date from string typescript

New date from string typescript

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New date from string typescript

Typescript new date from string invalid date. Typescript new date from string dd/mm/yyyy. Typescript new date from iso string. Typescript new date from string with timezone. Typescript new date from string format. Typescript new datetime from string.

We meet a new embedded object: Data. Keep the date, time and provides methods for managing the date/hour. For example, we can use it to store creation/modification times, to measure time, or simply to print the current date. Create To create a new Data object calls new Data() with one of the following topics: new Data() Without arguments ? create a Data object for the current date and time: leave now = new Data(); alert( now); // shows the current date/new date (milliseconds) Create a Date object with the time equal to the number of milliseconds (1/1000 second) passed after 1 January 1970 UTC+0. // 0 means 01.01.1970 UTC+0 leave Jan01_1970 = new Data(0); alert( Jan01_1970 ); // now add 24 hours, get 02.01.1970 UTC+0 let Jan02_1970 = new Data(24 An entire number that represents the number of milliseconds that has passed since the beginning of 1970 is called timestamp. It is a light numerical representation of a date. We can always create a date from a timestamp using the new Data(timestamp) and convert the existing Data object to a timestamp using the date.getTime(see below). Dates before 01.01.1970 have negative timestamps, for example: // 31 Dec 1969 let Dec31_1969 = new Date(-24 * 3600 * 1000); alert( Dec31_1969 ); new Date(datestring) If there is only one argument, and it is a string, then it is parsed automatically. The algorithm is the same as Date.parse uses, we will cover it later. let date = new Date("2017-01-26"); alert(data); // The time is not set, so it is assumed that it is midnight GMT and // is adjusted according to the time when the code is executed in // Then the result could be // Thu Jan 26 2017 11:00:00 GMT+1100 (Australian Eastern Daylight Time) // or // Wed 25 January 2017 16:00:00 GMT-0800 (Pacific Standard Time) new Date(year, month, date, time, time, minutes, seconds, date, date, zone ms date, zone Only the first two topics are mandatory. The year must have 4 digits: 2013 is fine, 98 is not. The count of the month begins with 0 (Jan), up to 11 (Dec). The given parameter is actually the day of the month, if absent then 1 is assumed. If hours/minutes/seconds/ms are absent, it is assumed that they are 0. For example: new Data(2011, 0, 1, 0, 0, 0, 0, 0); // 1 Jan 2011, 00:00:00:00 new Date(2011, 0, 1); // the same, hours etc are 0 by default The maximum accuracy is 1 ms (1/1000 sec): the date = new date (2011, 0, 1, 2, 3, 4, 567); notice (date ); // 1.01.2011, 02:03:04.567 Access date components There are methods to access the year, a month and so on from the Date object: getFullYear() Get the year (4 digits) getMonth() Get the month, from 0 to 11. getDate() Get the day of the month, from 1 to 31, the name of the method seems a little strange. getHours(), getMinutes(), getSeconds(), getMilliseconds() Get the corresponding time components. Many JavaScript enginesa non-standard method getYear(). This method is deprecated. returns the year 2 digitsPlease, never use it. There is getFullYear() for the year. In addition, we can get a day of the week: getDay() Get the day of the week, from 0 (Sunday) to 6 (Saturday.) The first day is always Sunday, in some countries that is not so, but cannot be changed. All the above methods report the local time zone components. There are also their UTC-counterparts, that day of return, month, year and so on for UTC+0 time zone: getUTCFullYear(,) getUTCMonth(,) getUTCDay(.) Just enter the UTC immediately after arrival. If your local time zone is moved compared to UTC, the code below shows several hours: // the current date leaves the date = new Date;() // the time in your current time zone (date.getHours()); // the time in UTC+0 time zone (day light saving time) warning (data.getUTCHours()); In addition to the methods indicated, there are two specials that do not have an UTC-variant: getTime() Returns the timestamp for the date ? a number of milliseconds passed since 1 January 1970 UTC+0. getTimezoneOffset() Returns the difference between UTC and the local time zone, in minutes: // if you are in UTC-1 time zone, exits 60 // if you are in UTC+3 time zone, exits -180 alert(new Data().getTimezoneOffset ); Date Component Setup The following methods allow you to set data/hour components: Each of them except setTime() has a UTC-variant, for example: setUTCHours(.) As we can see, some methods can set multiple components simultaneously, for example setHours. The components not mentioned are not modified. For example: let today = new Date;() today.setHours(0;) alert(today;) // still today, but the time has changed to 0 today.setHours(0, 0, 0, 0, 0;) alert(today;) // still today, now 00:00:00 sharp. Automatic correction Self-correction is a very useful feature of Date objects. We can set the values off line, and it will automatically arrange. For example: let date = new Date(2013, 0, 32;) // 32 Jan 2013 ?!? alert(date;) // .is 1st Feb 2013! The external data components are automatically distributed. Let's say that we must increase the date "28 Feb 2016" within 2 days. It can be "2 Mar" or "1 Mar" in case of a one-year leap. We don't need to think about it. Just add 2 days. The Data object will do the rest: leave date = new Date(2016, 1, 28;) date.setDate (date.getDate) + 2;) alert(data); // 1 Mar 2016 This feature is often used to get the date after the given time period. For example, we get the date for "70 seconds after hour": the date = new Data;() date.setSeconds(date.getSeconds) + 70;) alert(data)); // shows the correct date We can also set zero or even negative values. For example: let date = new Date(2016, 0, 2;) // 2 Jan 2016 date.setDate(1;) // set day 1 of month alert(date ); date.setDate(0;) // min day is 1, so the last day of the previous month wasnotice(date) // 31 Dec 2015 Date to number, date diff When a Data object is converted into number, it becomes the same timestamp of date.getTime(): = new Date (); alert (+date); // the number of milliseconds, the same as date.getTime () The important side effect: dates can be subtracted, the result is their difference in ms. This can be used to measure time: let start = new Date(); // start measuring time // does the job for (let i = 0; i < 100000; i++) { let doSomething = i * i; } let end = new Date(); // end measuring time alert( `The loop took ${end - start} ms` ); Date.now()If we just want to measure time, we don't need the Date object. There is a special Date.now () method that returns the current timestamp. It is semantically equivalent to new Date ().getTime (), but does not create an intermediate Date object. So it's faster and doesn't put pressure on the garbage collection. It is mostly used for convenience or when performance matters, such as in JavaScript games or other specialized applications. So this is probably better: let start = Date.now(); // milliseconds count from January 1, 1970 // do the work for (let i = 0; i < 100000; i++) { let doSomething = i * i; } let end = Date.now(); // done alert( `The loop took ${end - start} ms` ); // subtract numbers, not dates BenchmarkingIf we want a reliable benchmark of CPU-hungry functions, we need to be careful. For example, let?TMs measure two functions that calculate the difference between two dates: which one is faster? These performance measures are often called "benchmarks." // we have data1 and data2, which fastest function returns their difference in ms? function diffSubtract (date1, date2) { return date2 ? date1; } // o function diffGetTime (date1, date2) { return date2.getTime () ? date1.getTime (); } These two do exactly the same thing, but one of them uses an explicit date.getTime () to get the date in ms, and the other relies on a data-number transformation. Their result is always the same. So, what's the fastest? The first idea might be to run them many times in a row and measure the time difference. For our case, the functions are very simple, so we have to do it at least 100000 times. Measure: function diffSubtract(date1, date2) { return date2 - date1; } function diffGetTime(date1, date2) { return date2.getTime() - date1.getTime(); } function bench(f) { let date1 = new Date(0); let date2 = new Date(); let start = Date.now(); for (let i = 0; i < 100000; i++) f(date1, date2); return Date.now() - start; } alert( 'Time to diffSubtract: ' + bench(diffSubtract) + 'ms' ); alert( 'Time to diffGetTime: ' + bench(diffGetTime) + 'ms' ); Wow! Using getTime() is much faster! That?TMs because there?TMs no type conversion, it?TMs much easier for the engines to optimize. Okay, we got something. But that?TMs still not a good benchmark. Imagine that at the time of executing bench(diffSubtract) the CPU was doing something in parallel, and taking resources. And for the moment of the bank (diffGetTime) that the work is finished. A pretty real scenario for a modern multi-process operating system. As a result, the first benchmark will have less CPU CPU that the second. This can lead to wrong results. For a more reliable benchmarking, the entire benchmark package should be run several times. For example, such as this: diffSubtract function(date1, date2) {return date2 - date1; } diffGetTime function(date1, date2) {return date2.getTime() - date1.getTime(); } panca function(f) {lend date1=new Date(0); let date2=new Date(); letf) Modern JavaScript engines start to apply only advanced optimizations only Thus, in the example above, the first executions are not well optimized. We can add a heating performance: // added for "heating" before the main bench (diffSubtract); bench(diffGetTime); // now benchmark for (read i = 0; i < 10; i++) {time1 += bench(diffSubtract); time2 += bench(diffGetTime); } Modern JavaScript engines make many optimizations. They can change the results of "artificial tests" compared to "normal use", especially when we benchmark something very small, such as how an operator works, or an integrated function. So, if you seriously want to understand the performance, then please study how the JavaScript engine works. And then you probably won't need microbenchmarks at all. The large package of articles on V8 is at . Dates.parse from a string The Date.parse(str) method can read a date from a string. The string format should be: YYYY-MM-DDTHH:mm:sssZ, where: YYYY-MM-DD ? is the date: year day. The character "T" is used as a delimiter. HH:mm:sss.ss ? is the time: hours, minutes, seconds and milliseconds. The optional part "Z" indicates the time zone in +-hh:mm format. One Z letter would mean UTC+0. Shorter variants such as YYYY-MM-DD or YYYYY-MM or YYYYYY are also possible. The call to Date.parse(str) analyzes the string in the given format and returns the timestamp (number of milliseconds from 1 Jan 1970 UTC+0). If the format is not valid, it returns NaN. For example: let ms = Date.parse('2012-01-26T13:51:50.41707:00'); alert(ms); // 13276110417 (timestamp) We can instantly create a new object Date from the timestamp: le date = new Date( Date.parse('2012-01-26T13:51:50.417-07:00') ); alert(date); Summary Data and now in JavaScript are represented with the Data object. We cannot create "only the date" or "only the time": The objects of the date always bring both. The months are counted from zero (yes, January is a zero month). The days of the week in getDay() are also counted from zero (which is Sunday). Data auto-corrects itself when out-of-range components are set. Good for youdays/month/hour. Dates can be subtracted, giving their difference in milliseconds. This is because a date becomes the timestamp when converting into a number. Use Date.now() to get the current timestamp fast. Note that unlike many other systems, timestamps in JavaScript are in milliseconds, not in seconds. Sometimes we need more precise time measures. JavaScript itself does not have a way to measure time in microseconds (1 millionth of a second), but most environments provide it. For example, the browser has performance.now() that gives the number of milliseconds from the start of page loading with microsecond accuracy (3 digits after point): alert(` Loading started ${performance.now()}ms ago`); // Something like: "Loading started 34731.26000000001ms ago" // .26 is microseconds (260 microseconds) // more than 3 digits after the decimal point are precision errors, only the first 3 are correct Node.js has microtempo module and other ways. Technically, almost any device and environment allows you to get more precision, it is not only in Data. Data.

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