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Date and Time

Notes

  • get the date as number: Date.parse(ddate);
  • get a readable date: Date(ddate).toLocalString()

basic Date Time operations

    // you can pass a date or duration (number) or empty to get the time now
    > x = new Date("2020-05-26T12:19:38.430Z")  //Tue May 26 2020 13:19:38 GMT+0100 (British Summer Time)
    > x.getFullYear() // 2020
    > x.getMonth() //4
    > const month = x.toLocaleString('default', { month: 'long' }); // May
    > let duration = ( new Date() ).getTime() - x.getTime(); //208426207 // distance between 2 dates
    > duration.toLocaleString() // "208,426,207"
    > duration.toString() //"208426207"
    > x.getDay() // 2 // second day on the week Tuesday
    > x.getDate() // 26 // day of the month

Duration

  • display the distance between a date and the moment

        const calculateDuration = (num) => {
    let durationDate = new Date(num);
    var epoch = new Date('1970-01-01 00:00:00-0600');
    var diff_years = durationDate.getYear() - epoch.getYear();
    var diff_month = durationDate.getMonth() - epoch.getMonth();
    var diff_days = durationDate.getDate() - epoch.getDate();

    let yy = diff_years ? diff_years + ' years ' : '';
    let mm = diff_month ? diff_month + ' months ' : '';
    let dd = diff_days ? diff_days + ' days ' : '';

    return `${yy} ${mm} ${dd}`
    }

    /*
    * if num = "208426207" => calculateDuration is `2 days`.
    */

  • using day.js:

     // duration from now
 > dayjs(date).fromNow() // 2 years ago
 > dayjs(date).fromNow(true) // 2 years
 > dayjs(date).fromNow() // 2 days ago // time from now up to ${date}

 // duration between 2 dates 
 > dayjs(date1).from(date2) // 2 years ago
 > daysjs(date1).from(date2, true) // 2 years

 //format date
  > dayjs(date).format('DD MMMM YYYY') // 20 May 2020

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