is there a way to parse the iso 8601 week day form...

# kotlinx-datetime

[Rohde Fischer]

is there a way to parse the iso 8601 week day format - i.e. can I want to parse a string such as 2024-w2-1

[Dmitry Khalanskiy [JB]]

Not at the moment, but we are open to adding this.

[Dmitry Khalanskiy [JB]]

We'd like to collect the use cases first, though: is this format just mandated by something your program interacts with, or do you want to somehow use the ISO week number?

[Rohde Fischer]

The use case is a system for work shifts where everyone thinks in terms of weeks, including the external party that integrated with - ironically enough they calculate at 00:00 on the Monday of the given week rather than give the week-number, so they do a lot of roundabout calculations, where I'd (if possible) want to lean on standards

[Rohde Fischer]

one thing that's particular interesting imo is the one without the day, so e.g. 2024-W19, which could be considered a period (from Monday-Sunday/Sunday-Saturday, depending on the locale). But translating it into a period looses the semantic meaning of weeks

[Dmitry Khalanskiy [JB]]

ISO week-based-year has a strange property: the year boundaries are adjusted so that every year consists only of whole weeks. Example: https://pl.kotl.in/--A79fvRe
Do you actually want this behavior?

[Dmitry Khalanskiy [JB]]

@Rohde Fischer, any updates on this?

[Rohde Fischer]

sorry for the silence, I've been quite offline

[Rohde Fischer]

to some extent, the current version of my solution is here: https://github.com/rohdef/rfbpa/tree/main/rfweeks/src/commonMain/kotlin/dk/rohdef/rfweeks it has to be noted that it's made with the domain of rfbpa in mind, and not necessarily general purpose (although I try to move it in that general direction). Also note that I make heavy use of the Either-monad (which IMO every project should, domain errors should never be exceptions)

[Rohde Fischer]

from the parsing perspective YearWeek is the most interesting class, because that's the one that deals with all the iffy logic with when week 1 starts and how to map between dates and weeks etc.