I have duration string that looks like:

1:16.352

where 1 is minutes part, 16 is seconds part and 352 is millisecond part.

I wanted to use Duration.fromISOTime but I get:

{
  "reason": "unparsable",
  "explanation": "the input \"1:16.352\" can't be parsed as ISO 8601"
}

Is there a clean way of parsing such duration in Luxon?

I have duration string that looks like:

1:16.352

where 1 is minutes part, 16 is seconds part and 352 is millisecond part.

I wanted to use Duration.fromISOTime but I get:

{
  "reason": "unparsable",
  "explanation": "the input \"1:16.352\" can't be parsed as ISO 8601"
}

Is there a clean way of parsing such duration in Luxon?

• javascript
• typescript
• duration
• luxon

Share Improve this question Follow edited Feb 18, 2021 at 13:27 pixel asked Feb 18, 2021 at 10:38 pixelpixel 26.5k3939 gold badges168168 silver badges285285 bronze badges 3

• 1 @OlegValter afaik Duration does not have such method – pixel Commented Feb 18, 2021 at 11:11
• apologies, I misread the question - how about fromObject method? Seems like you can split on a dot and use the values - or do you want to find a method that accepts custom formats directly? – 0Valt Commented Feb 18, 2021 at 11:18
• 2 1:16.354 is neither a valid ISO-8601 time (00:01:16.354) or duration (PT1M16.352S) and cannot be parsed as if it is. – phuzi Commented Feb 18, 2021 at 14:14

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 5

Duration.fromISOTime does not work since 1:16.352 is not an ISO 8601 time string, the hour part is missing (see ISO 8601 Times).

A workaround to build a Luxon Duration object could be the following:

const DateTime = luxon.DateTime;
const Duration = luxon.Duration;

const startOfHour = DateTime.local().startOf('hour').toMillis();
const dt = DateTime.fromFormat("1:16.352", "m:ss.SSS"). toMillis();
const dur = Duration.fromMillis(dt - startOfHour);
console.log(dur.toFormat("m 'minute' s 'second' S 'millis'"));

<script src="https://cdn.jsdelivr/npm/[email protected]/build/global/luxon.js"></script>

Similarly to @VincenzoC I adjusted my input string:

const Duration = luxon.Duration;

var output;
const durationInput = "1:16.352"

if (durationInput.match(/:/g) || [].length === 1) {
  const semicolonLocation = durationInput.indexOf(":");

  if (semicolonLocation === 1) {
    output = "00:0" + durationInput;
  }

  if (semicolonLocation === 2) {
    output = "00:" + durationInput;
  }
}

console.log(Duration.fromISOTime(output));

<script src="https://cdn.jsdelivr/npm/[email protected]/build/global/luxon.js"></script>

As I mentioned in the ments, you can use the fromObject static method bined with simply splitting the input into minutes, seconds, and milliseconds configuration options. In your case a trivial regular expression (\d+):(\d+)\.(\d+) should do the trick, no temporary dates or normalization required.

const { Duration } = luxon;
const durationInput = "1:16.352";

const fromCustom = (input) => {
  const [, minutes, seconds, milliseconds ] = input.match(/(\d+):(\d+)\.(\d+)/);
    
  return Duration.fromObject({
    minutes, seconds, milliseconds
  });
};

console.log(fromCustom(durationInput));

<script src="https://cdn.jsdelivr/npm/[email protected]/build/global/luxon.js"></script>