CODEWITHSUNDEEP
javascriptmomentjs
Neha M
Neha M

Reputation: 463

Checking if date text has milliseconds and seconds in momentjs

I am trying to parse a date from a text format to see if milliseconds and seconds were included in it. For e.g.

let text = '2016-02-02 14:30:34.234';
const timezone = 'America/Los_Angeles';
// const hasMS = utcParse('%Y-%m-%d %H:%M:%S.')(text);
// const hasSeconds = utcParse('%Y-%m-%d %H:%M:')(text);

const hasMS = !!moment.tz(text, 'YYYY-MM-DD HH:MM:ss.', timezone);
console.log('hasMS', hasMS);
const hasSeconds = !!moment.tz(text, 'YYYY-MM-DD HH:MM:', timezone);
console.log('hasSeconds', hasSeconds);

Basically I am trying to replace the commented code. utcParse() from d3.time-format would check if the date text has milliseconds and seconds in it. I tried a couple of things for momentjs library, but it doesn't seem to work.

Upvotes: 0

Views: 709

Answers (1)

rioV8
rioV8

Reputation: 28673

By using Regular expressions you can check if certain parts of the string are present.

If you call matchDateTime() with the string you get an array back with all the matched groups.

let text_min = '2016-02-02 14:30';
let text_sec = '2016-02-02 14:30:34';
let text_ms = '2016-02-02 14:30:34.234';

function matchDateTime(text) { return text.match(/(\d{4})-(\d\d)-(\d\d) (\d\d):(\d\d)(?::(\d\d)(?:\.(\d\d\d))?)?/); }

function hasSeconds(text) { return !!matchDateTime(text)[6]; }
function hasMilliSeconds(text) { return !!matchDateTime(text)[7]; }

function testTimeString(text) {
  console.log(text, "hasSeconds=", hasSeconds(text));
  console.log(text, "hasMilliSeconds=", hasMilliSeconds(text));
}

testTimeString(text_min);
testTimeString(text_sec);
testTimeString(text_ms);

console.log(matchDateTime(text_ms));

Upvotes: 2

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