JavaScript: Date Cheat Sheet

// NEW DATE OBJECT    // new Date() - will create a new Date Object in a current date    let date = new Date();    console.log(date); //Tue Feb 16 2021 12:04:01 GMT+0800 (Philippine Standard Time)    let date2 = date2 = new Date('August 19, 1975 23:15:30 GMT-02:00'); // you can pass a date inside a parameter// DATE NOW FUNCTION    //Date.now - Returns the numeric value corresponding to the current time    console.log(Date.now()); //1613449122179 // UTC DATE    const utcDate1 = new Date(Date.UTC(96, 1, 2, 3, 4, 5));    const utcDate2 = new Date(Date.UTC(0, 0, 0, 0, 0, 0));    console.log(utcDate1.toUTCString()); // expected output: Fri, 02 Feb 1996 03:04:05 GMT    console.log(utcDate2.toUTCString()); // expected output: Sun, 31 Dec 1899 00:00:00 GMT

let date = new Date();// Get Current Datelet dt= date.getDate(); // 16// Get Daylet day = date.getDay(); // 1 - Monday//Get Yearlet year = date.getFullYear(); // 2021//Get Hourslet hours = date.getHours(); // 14// Get Minuteslet minute = date.getMinutes(); // 48// Get Secondslet sec = date.getSeconds(); // 29// Get Time - method returns the number of milliseconds    // NOTE: _getTime() always uses UTC for time representation.    // For example, a client browser in one timezone,    // getTime() will be the same as a client browser in any other timezone._let time = date.getTime(); // 14254782000// Get TimeZone offset - method returns the time zone difference, in minutes, from current locale (host system settings) to UTC.let time_zone_offset = date.getTimezoneOffset(); //-480// ___________________// Getting UTC DATES// ____________________const date1 = new Date('December 31, 1975, 23:15:30 GMT+11:00');const date2 = new Date('August 19, 1975 23:15:30 GMT-11:00');// Get UTC dateconsole.log(date1.getUTCDate()); // expected output: 19console.log(date2.getUTCDate()); // expected output: 20// get UTC day    // Tuesday    console.log(date1.getUTCDay()); // expected output: 2    // Wednesday    console.log(date2.getUTCDay()); // expected output: 3// get UTC Yearconsole.log(date1.getUTCFullYear()); // expected output: 1975console.log(date2.getUTCFullYear()); // expected output: 1976// get UTC Hoursconsole.log(date1.getUTCHours()); // expected output: 12console.log(date2.getUTCHours()); // expected output: 10// Get UTC Milisecondsconst exampleDate = new Date('2018-01-02T03:04:05.678Z'); // 2 January 2018, 03:04:05.678 (UTC)console.log(exampleDate.getUTCMilliseconds()); // expected output: 678// GET UTC Minutes    const date1 = new Date('1 January 2000 03:15:30 GMT+07:00');    const date2 = new Date('1 January 2000 03:15:30 GMT+03:30');    console.log(date1.getUTCMinutes()); // 31 Dec 1999 20:15:30 GMT// expected output: 15    console.log(date2.getUTCMinutes()); // 31 Dec 1999 23:45:30 GMT// expected output: 45// GET UTC MONTHS    const date1 = new Date('December 31, 1975, 23:15:30 GMT+11:00');    const date2 = new Date('December 31, 1975, 23:15:30 GMT-11:00');    // December    console.log(date1.getUTCMonth());// expected output: 11    // January    console.log(date2.getUTCMonth());// expected output: 0// GET UTC SECONSconst moonLanding = new Date('July 20, 1969, 20:18:04 UTC');console.log(moonLanding.getUTCSeconds()); // expected output: 4

// SET DATE    const event = new Date('August 19, 1975 23:15:30');    event.setDate(24);    console.log(event.getDate()); // expected output: 24    event.setDate(32); // Only 31 days in August!    console.log(event.getDate()); // expected output: 1// SET FULL YEAR    const event = new Date('August 19, 1975 23:15:30');    event.setFullYear(1969);    console.log(event.getFullYear()); // expected output: 1969    event.setFullYear(0);    console.log(event.getFullYear()); // expected output: 0// SET HOURS    const event = new Date('August 19, 1975 23:15:30');    event.setHours(20);    console.log(event); // expected output: Tue Aug 19 1975 20:15:30 GMT+0200 (CEST)    // (note: your timezone may vary)    event.setHours(20, 21, 22);    console.log(event); // expected output: Tue Aug 19 1975 20:21:22 GMT+0200 (CEST)// SET MILLISECONDS    const event = new Date('August 19, 1975 23:15:30');    console.log(event.getMilliseconds()); // expected output: 0    event.setMilliseconds(456);    console.log(event.getMilliseconds()); // expected output: 456// SET MINUTES    const event = new Date('August 19, 1975 23:15:30');    event.setMinutes(45);    console.log(event.getMinutes()); // expected output: 45    console.log(event); // expected output: Tue Aug 19 1975 23:45:30 GMT+0200 (CEST)    // (note: your timezone may vary)// SET MONTH    const event = new Date('August 19, 1975 23:15:30');    event.setMonth(3);    console.log(event.getMonth()); // expected output: 3    console.log(event); // Sat Apr 19 1975 23:15:30 GMT+0100 (CET)    // (note: your timezone may vary)// SET SECONDS    const event = new Date('August 19, 1975 23:15:30');    event.setSeconds(42);    console.log(event.getSeconds()); // expected output: 42    console.log(event); // Sat Apr 19 1975 23:15:42 GMT+0100 (CET)    // (note: your timezone may vary)// SET TIME    const event1 = new Date('July 1, 1999');    const event2 = new Date();    event2.setTime(event1.getTime());    console.log(event1); // expected output: Thu Jul 01 1999 00:00:00 GMT+0200 (CEST)    console.log(event2); // expected output: Thu Jul 01 1999 00:00:00 GMT+0200 (CEST)    // (note: your timezone may vary)// _____________// SET UTC DATES// _____________// SET UTC DATE    const event = new Date('August 19, 1975 23:15:30 GMT-3:00');    console.log(event.getUTCDate()); // expected output: 20    event.setUTCDate(19);    console.log(event.getUTCDate()); // expected output: 19// SET UTC FULL YEAR    const event = new Date('December 31, 1975 23:15:30 GMT-3:00');    console.log(event.toUTCString()); // Thu, 01 Jan 1976 02:15:30 GMT    console.log(event.getUTCMonth()); // expected output: 0    event.setUTCMonth(11);    console.log(event.toUTCString()); // expected output: Wed, 01 Dec 1976 02:15:30 GMT// SET UTC HOURS    const event = new Date('August 19, 1975 23:15:30 GMT-3:00');    console.log(event.toUTCString()); // expected output: Wed, 20 Aug 1975 02:15:30 GMT    console.log(event.getUTCHours()); // expected output: 2    event.setUTCHours(23);    console.log(event.toUTCString()); // expected output: Wed, 20 Aug 1975 23:15:30 GMT// SET UTC MILLISECONDS    const date1 = new Date('2018-01-24T12:38:29.069Z');    console.log(date1.getUTCMilliseconds()); // expected output: 69    date1.setUTCMilliseconds(420);    console.log(date1.getUTCMilliseconds()); // expected output: 420// SET UTC MINUTES    const date1 = new Date('December 31, 1975, 23:15:30 GMT+11:00');    console.log(date1.getUTCMinutes()); // expected output: 15    date1.setUTCMinutes(25);    console.log(date1.getUTCMinutes()); // expected output: 25// SET UTC MONTH    const event = new Date('December 31, 1975 23:15:30 GMT-3:00');    console.log(event.toUTCString()); // Thu, 01 Jan 1976 02:15:30 GMT    console.log(event.getUTCMonth()); // expected output: 0    event.setUTCMonth(11);    console.log(event.toUTCString()); // expected output: Wed, 01 Dec 1976 02:15:30 GMT// SET UTC SECONDS    const date1 = new Date('December 31, 1975, 23:15:30 GMT+11:00');    console.log(date1.getUTCSeconds()); // expected output: 30    date1.setUTCSeconds(39);    console.log(date1.getUTCSeconds()); // expected output: 39

//Date.now - method returns the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC.console.log(Date.now()); //1613449122179 // USING PARSE FUNCTION    const unixTimeZero = Date.parse('01 Jan 1970 00:00:00 GMT');    const javaScriptRelease = Date.parse('04 Dec 1995 00:12:00 GMT');    console.log(unixTimeZero); // expected output: 0    console.log(javaScriptRelease); // expected output: 818035920000// TO DATE STRING    const event = new Date(1993, 6, 28, 14, 39, 7);    console.log(event.toString()); // expected output: Wed Jul 28 1993 14:39:07 GMT+0200 (CEST)    // (note: your timezone may vary)    console.log(event.toDateString()); // expected output: Wed Jul 28 1993// TO ISO STRING    const event = new Date('05 October 2011 14:48 UTC');    console.log(event.toString()); // expected output: Wed Oct 05 2011 16:48:00 GMT+0200 (CEST)    // (note: your timezone may vary)    console.log(event.toISOString()); // expected output: 2011-10-05T14:48:00.000Z// TO JSON    const event = new Date('August 19, 1975 23:15:30 UTC');    const jsonDate = event.toJSON();    console.log(jsonDate); // expected output: 1975-08-19T23:15:30.000Z    console.log(new Date(jsonDate).toUTCString()); // expected output: Tue, 19 Aug 1975 23:15:30 GMT// TO LOCAL DATE SCTRING    const event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));    const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };    console.log(event.toLocaleDateString('de-DE', options)); // expected output: Donnerstag, 20. Dezember 2012    console.log(event.toLocaleDateString('ar-EG', options)); // expected output:        console.log(event.toLocaleDateString(undefined, options)); // expected output: Thursday, December 20, 2012 (varies according to default locale)// TO LOCALE STRING    const event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));    // British English uses day-month-year order and 24-hour time without AM/PM    console.log(event.toLocaleString('en-GB', { timeZone: 'UTC' })); // expected output: 20/12/2012, 03:00:00    // Korean uses year-month-day order and 12-hour time with AM/PM    console.log(event.toLocaleString('ko-KR', { timeZone: 'UTC' })); // expected output: 2012. 12. 20.  3:00:00// TO LOCAL TIME STRING    // Depending on timezone, your results will vary    const event = new Date('August 19, 1975 23:15:30 GMT+00:00');    console.log(event.toLocaleTimeString('en-US')); // expected output: 1:15:30 AM    console.log(event.toLocaleTimeString('it-IT')); // expected output: 01:15:30    console.log(event.toLocaleTimeString('ar-EG')); // expected output: :: // TO STRING    const event = new Date('August 19, 1975 23:15:30');    console.log(event.toString()); // expected output: Tue Aug 19 1975 23:15:30 GMT+0200 (CEST)    // (note: your timezone may vary)// TO TIME STRING    const event = new Date('August 19, 1975 23:15:30');    console.log(event.toTimeString()); // expected output: 23:15:30 GMT+0200 (CEST)    // (note: your timezone may vary)// TO UTC STRING    const event = new Date('14 Jun 2017 00:00:00 PDT');    console.log(event.toUTCString()); // expected output: Wed, 14 Jun 2017 07:00:00 GMT// USING VALUE OF FUNCTION    const date1 = new Date(Date.UTC(96, 1, 2, 3, 4, 5));    console.log(date1.valueOf()); // expected output: 823230245000    const date2 = new Date('02 Feb 1996 03:04:05 GMT');    console.log(date2.valueOf()); // expected output: 823230245000