Returned `validTime` on items is not parseable by JavaScript. Cannot recognize lexical duration. What is this for? #331

joelworsham · 2020-06-23T16:28:55Z

joelworsham
Jun 23, 2020

I'm querying the API in Node and parsing the results. I want to pass each validTime property to a new Date(), but I get Invalid Date.

I figured out it was the lexical duration PT2H at the end of each date. So, in other words, this works:

new Date('2020-06-26T08:00:00+00:00')

and this does not:

new Date('2020-06-26T08:00:00+00:00/PT1H')

So, I have a some questions:

My assumption, based on the UTC offset being at 00:00 in all of them, is that the returned times are in UTC. Is this correct?
What does the lexical duration represent? It ranges anywhere from 1-7 in my response, and I don't understand how to interpret it.

Here is the repository I'm using for this (that I created): https://github.com/joelworsham/sunniest-time/tree/debugging-date-parse

If you pull that down, have node installed, and run the ./index file, you should see what I'm talking about.

joelworsham · 2020-06-23T16:29:36Z

joelworsham
Jun 23, 2020
Author

To save time, here is a the console output for running this ^^^

/Users/jworsham/.nvm/versions/node/v13.10.1/bin/node /Users/jworsham/Projects/Personal/SunniestTime/index.js
INVALID PARSING: 2020-06-25T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T09:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-25T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T15:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T06:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T05:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T16:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T03:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-26T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T06:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T02:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T05:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T06:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T04:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T17:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T01:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T00:00:00+00:00/PT4H Invalid Date
INVALID PARSING: 2020-06-26T00:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T05:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T09:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-24T04:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T18:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T23:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T03:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T02:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T01:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T23:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T23:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-23T21:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-24T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T22:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T22:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T09:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-25T21:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T09:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T10:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T15:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T15:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T10:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T16:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T21:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T06:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T17:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T16:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T05:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T18:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-24T18:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T09:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T04:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T15:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T15:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T16:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-30T16:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T17:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T10:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T18:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T21:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T03:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T17:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T19:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-30T22:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-27T03:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T02:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T18:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-07-01T00:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T04:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T01:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T00:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T18:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T02:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T05:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T23:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T06:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T22:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T17:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T01:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T21:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T15:00:00+00:00/PT4H Invalid Date
INVALID PARSING: 2020-06-26T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-28T23:00:00+00:00/PT6H Invalid Date
INVALID PARSING: 2020-06-29T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T20:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T06:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-26T21:00:00+00:00/PT4H Invalid Date
INVALID PARSING: 2020-06-28T21:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-29T05:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-29T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T21:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-30T05:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T23:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-30T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T19:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T07:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T01:00:00+00:00/PT2H Invalid Date
INVALID PARSING: 2020-06-30T04:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T09:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T08:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T03:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T10:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-27T15:00:00+00:00/PT4H Invalid Date
INVALID PARSING: 2020-06-29T10:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-29T09:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-30T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T16:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T15:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T14:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T13:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T12:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T11:00:00+00:00/PT1H Invalid Date
INVALID PARSING: 2020-06-23T10:00:00+00:00/PT1H Invalid Date
[]

Process finished with exit code 0

0 replies

StephenClouse · 2020-06-23T16:44:28Z

StephenClouse
Jun 23, 2020
Maintainer

As you've noticed, the reason you can't parse it with Date.parse is because it is not a pure date. It is a time interval expressed in ISO8601 format. You will need to use something more appropriate for this. I know moment.js >= 2.3.0 can parse ISO8601 durations, e.g. moment.duration('P1Y2M3DT4H5M6S');

The only thing you can assume regarding the UTC offset is that we will provide it via expressing the time instant in ISO8601 format. We do tend towards putting everything in UTC internally but this is not guaranteed, so use something that can parse ISO8601 and do not assume UTC.

0 replies

joelworsham · 2020-06-25T19:26:21Z

joelworsham
Jun 25, 2020
Author

Thank you for your answer! Moment actually cannot parse this date string. I have tried that as well. I'm not sure there's a way to parse the entirety of the string without pre-processing (chopping the end off and using it or tossing it) in JavaScript.

What does the lexical duration represent? It ranges anywhere from 1-7 in my response, and I don't understand how to interpret it.

0 replies

StephenClouse · 2020-06-25T19:42:21Z

StephenClouse
Jun 25, 2020
Maintainer

Sorry, I meant to say I understood that moment can't parse the string as-is, but it can deal with the two components of it.

The interval is the length of time for which that value is valid. So 2020-06-25T12:00:00+00:00/PT1H is one hour starting at 6/25 1200Z (IOW, until 1300Z). Whatever value is attached to that is considered valid for that internal. So if that is attached to a temperature value of, say, 75°, then the forecast is for 75° during that interval.

Grid values generally start at one-hour resolution, with reduced resolution (up to 3- and 6-hour intervals) as we get farther out from the present and things become more uncertain.

We also do run-length compression, so if multiple consecutive hours have the same value, we will present that as a longer duration interval (PT3H) rather than multiple one-hour intervals.

I hope that explains a bit about interpreting the data. It may help to look at the raw data alongside the hourly forecast.

0 replies

joelworsham · 2020-06-26T14:31:32Z

joelworsham
Jun 26, 2020
Author

That makes perfect sense. Thank you so much for the detailed explanation :)

0 replies

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Returned validTime on items is not parseable by JavaScript. Cannot recognize lexical duration. What is this for? #331

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Returned `validTime` on items is not parseable by JavaScript. Cannot recognize lexical duration. What is this for? #331

joelworsham
Jun 23, 2020

joelworsham
Jun 23, 2020
Author

StephenClouse
Jun 23, 2020
Maintainer

joelworsham
Jun 25, 2020
Author

StephenClouse
Jun 25, 2020
Maintainer

joelworsham
Jun 26, 2020
Author