`isISO8601` doesn't support duration

[snebjorn]

isISO8601 appears to only check dates. But the ISO 8601 spec includes a bunch of different formats.

https://github.com/validatorjs/validator.js/blob/4197b8632522818164cc05d8d6cb44c98eb3decd/src/lib/isISO8601.js#L39

The isISO8601 validator name is a bit misleading as it suggests that it support the entire ISO 8601 spec. I discovered this wanting to use it to validate an ISO 8601 duration input, example: P3Y6M4DT12H30M5S.

So I'd like to request support for ISO 8601 durations. I'd humbly suggest a name change for this validator. It can be split into isISO8601Date, isISO8601Duration, etc

[WikiRik]

ISO 8601 is indeed a large spec with various features, that might not fit in a single validator. Can you elaborate a bit on why you would want to validate duration input and why it would be a good addition to this project?

[snebjorn]

I can try :)

Currently this library doesn't support duration inputs - I was unable to find a suitable validator Users have to fallback on regex and matches which does work. But writing the regex isn't straight forward. I found this regex on stack overflow and it's quite a mouthful

^P(?!$)(\d+(?:\.\d+)?Y)?(\d+(?:\.\d+)?M)?(\d+(?:\.\d+)?W)?(\d+(?:\.\d+)?D)?(T(?=\d)(\d+(?:\.\d+)?H)?(\d+(?:\.\d+)?M)?(\d+(?:\.\d+)?S)?)?$

And that only handles the P[n]Y[n]M[n]DT[n]H[n]M[n]S format. There are alternative formats. PnW and P<date>T<time>. All in all it's not trivial to validate an ISO 8601 duration input.

As to why someone would want to use ISO 8601 duration is because it's a simple why to describe a duration 😄 and it's an ISO standard. It's not concerned with time zones. It's a simple way to describe; 5 min, 1 hour or 1 day, etc

[TigerC10]

I'm having this issue too. In my use case, I need to describe media objects like audio/video which have a length defined as a duration.

Recommend adding an isISO8601Duration function for duration.