[jjolla888]

> #Does what it says on the tin > say "Yippee" if $date.later(:5years).is-leap-year;

Is that a Georgian or Benghali or Indian or Buddist Era Thai leap year?

Actually are we talking the Georgian calendar - or the Julian, Revised Julian, Coptic, Ethiopian, Chinese, Hebrew, Islamic, Hindu, Bahai, or Solar Hejri calendar ?

[VLM]

I have to admit the documentation for perl6 is absolutely excellent as the very first English prose line on the very first google result answers your very reasonable first question about a date class.

https://docs.perl6.org/type/Date

"A Date is an immutable object identifying a day in the Gregorian calendar."

I like a language that's not surprising, with easy to find answers. My experience with Perl over the decades is everything about it meets expectations to a spooky extent, which is also nice. The surprise factor for Perl is very low.

It seems to define excellence in programming language documentation. Is there anything better out there?

[raiph]

From https://docs.perl6.org/type/Date:

"A Date is an immutable object identifying a day in the Gregorian calendar."

(It's proleptic.)

The days used in DateTime, which is compatible with the Date class, also identify days in the Gregorian calendar.

(DateTime adopts RFC 3339[1].)

The `is-leap-year` methods for both classes refer to the Gregorian calendar year.

For a civil calendar independent date, use the `daycount` method to return a Modified Julian Day[2].

The `Dateish` role[3] abstracts from any particular civil calendar.

I'm not aware of any routines, built in or in existing Perl 6 modules, for conversion to other calendars.

[1] https://www.ietf.org/rfc/rfc3339.txt

[2] http://tycho.usno.navy.mil/mjd.html

[3] https://docs.perl6.org/type/Dateish