javascript, how to change timestamp for elements in array?

Question

I have array with this timestamps,

var labels = ["2018-12-01T00:00:00.000Z", 
              "2018-12-02T00:00:00.000Z",
              "2018-12-09T00:00:00.000Z", 
              "2018-12-09T00:00:00.000Z",
              "2018-12-18T00:00:00.000Z" 
             ]

what is the best way to have array in format 2018-12-01. I need to have date for graph

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– CertainPerformance, Commented Dec 19, 2018 at 0:35

Jack Bashford · Accepted Answer · 2018-12-19 00:49:12Z

1

You should use Array.prototype.map(), and create a new array with the characters you don't want sliced off the end:

var labels = ["2018-12-01T00:00:00.000Z", 
    "2018-12-02T00:00:00.000Z",
    "2018-12-09T00:00:00.000Z", 
    "2018-12-09T00:00:00.000Z",
    "2018-12-18T00:00:00.000Z" 
];

var truncated = labels.map(str => str.slice(0, -14));
console.log(truncated);

answered Dec 19, 2018 at 0:49

Jack Bashford

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Comments

Jason Kim · Accepted Answer · 2018-12-19 00:45:40Z

0

Have you considered using moment?

function updateTimeFormat(arr) {
  return arr.map(x => {
    return moment(x).format('YYYY-MM-DD');
  });
}

answered Dec 19, 2018 at 0:45

Jason Kim

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Comments

Aanand Kainth · Accepted Answer · 2018-12-19 00:51:05Z

0

You can use the built-in Date, as so:

labels.map(label => {
    const date = new Date(label);
    return `${date.getFullYear()}-${date.getMonth()}-${date.getDate()}`;
}

answered Dec 19, 2018 at 0:51

Aanand Kainth

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0.sh · Accepted Answer · 2018-12-19 00:58:56Z

0

you can achieve what you want by using Array.prototype.map

var labels = ["2018-12-01T00:00:00.000Z", 
              "2018-12-02T00:00:00.000Z",
              "2018-12-09T00:00:00.000Z", 
              "2018-12-09T00:00:00.000Z",
              "2018-12-18T00:00:00.000Z" 
             ];

const newDates = labels.map( label => {
    const newd = new Date(label);
    const fullYear = newd.getFullYear();
    const month = (newd.getMonth() + 1 ).toString();
    const date = (newd.getDate()).toString();
    return `${fullYear}-${month.length > 1 ? month : month.replace(/^/,0)}-${date.length > 1 ? date : date.replace(/^/,0)}`;
});

console.log(newDates);

answered Dec 19, 2018 at 0:58

0.sh

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