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Fix Date.to_iso8601/2 loses :format with custom calendar #15740

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Merged
josevalim merged 1 commit into from
Aug 13, 2026
+11 −1
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Fix Date.to_iso8601/2 loses :format with custom calendar #15740

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2 changes: 1 addition & 1 deletion lib/elixir/lib/calendar/date.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -422,7 +422,7 @@ defmodule Date do
def to_iso8601(%{calendar: _} = date, format) when format in [:basic, :extended] do
date
|> convert!(Calendar.ISO)
|> to_iso8601()
|> to_iso8601(format)
end

@doc """
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10 changes: 10 additions & 0 deletions lib/elixir/test/elixir/calendar/date_test.exs
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Expand Up @@ -38,6 +38,16 @@ defmodule DateTest do
end
end

test "to_iso8601/2" do
date = ~D[2000-01-01]
assert Date.to_iso8601(date) == "2000-01-01"
assert Date.to_iso8601(date, :basic) == "20000101"

holo_date = Calendar.Holocene.date(12001, 1, 1)
assert Date.to_iso8601(holo_date) == "2001-01-01"
assert Date.to_iso8601(holo_date, :basic) == "20010101"
end

test "to_string/1" do
date = ~D[2000-01-01]
assert to_string(date) == "2000-01-01"
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