I miss some function which would tell me if year is leap. Did I miss something or it is really missi...

# kotlinx-datetime

[Jan Skrasek]

I miss some function which would tell me if year is leap. Did I miss something or it is really missing?

[ilya.gorbunov]

There's no direct way so far, but you can construct the dates Mar 1 and Feb 1 of that year, find the number of days between them and decide whether the year is leap based on that number.
What is your use case, though?

[Jan Skrasek]

I have a date and I want to know number of days in that month. date.month.length() requires to pass that boolean.

[ilya.gorbunov]

In that case you can construct the first day of that month, add one month to it, and then find the number of days between these two dates:

val d1 = LocalDate(date.year, date.month, 1)
val d2 = d1.plus(1, DateTimeUnit.MONTH)
val days = d1.until(d2, DateTimeUnit.DAY)

[Jan Skrasek]

Thanks, I did it somehow similarly (also restructured the code to not need it directly this way).

But the main issue here IMO the current API which asks for something I don't have.

Either I'd like
a) to not provide the isYearLeap. (date.month.length) (I know, it's enum, so maybe something like date.monthLength).
b) or provide easily (date.month.length(date.isYearLeap) or date.month.length(isYearLeap(date)))