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defmodule Calendar.Holocene do | ||
# This calendar is used for tests with an none ISO calendar. | ||
# It implements the Holocene calendar, which is based on the | ||
# Proleptic Gregorian calendar with every year + 10_000. | ||
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@behaviour Calendar | ||
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def date(year, month, day) do | ||
%Date{year: year, month: month, day: day, calendar: __MODULE__} | ||
end | ||
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def naive_datetime(year, month, day, hour, minute, second, microsecond \\ {0, 0}) do | ||
%NaiveDateTime{ | ||
year: year, | ||
month: month, | ||
day: day, | ||
hour: hour, | ||
minute: minute, | ||
second: second, | ||
microsecond: microsecond, | ||
calendar: __MODULE__ | ||
} | ||
end | ||
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@impl true | ||
def date_to_string(year, month, day) do | ||
"#{year}-#{zero_pad(month, 2)}-#{zero_pad(day, 2)}" | ||
end | ||
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@impl true | ||
def naive_datetime_to_string(year, month, day, hour, minute, second, microsecond) do | ||
"#{year}-#{zero_pad(month, 2)}-#{zero_pad(day, 2)} " <> | ||
Calendar.ISO.time_to_string(hour, minute, second, microsecond) | ||
end | ||
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@impl true | ||
def datetime_to_string( | ||
year, | ||
month, | ||
day, | ||
hour, | ||
minute, | ||
second, | ||
microsecond, | ||
time_zone, | ||
zone_abbr, | ||
utc_offset, | ||
std_offset | ||
) do | ||
"#{year}-#{zero_pad(month, 2)}-#{zero_pad(day, 2)} " <> | ||
Calendar.ISO.time_to_string(hour, minute, second, microsecond, :extended) <> | ||
Calendar.ISO.offset_to_string(utc_offset, std_offset, time_zone, :extended) <> | ||
zone_to_string(utc_offset, std_offset, zone_abbr, time_zone) | ||
end | ||
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defp zone_to_string(_, _, _, "Etc/UTC"), do: "" | ||
defp zone_to_string(_, _, abbr, zone), do: " " <> abbr <> " " <> zone | ||
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@impl true | ||
defdelegate time_to_string(hour, minute, second, microsecond), to: Calendar.ISO | ||
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@impl true | ||
def day_rollover_relative_to_midnight_utc(), do: {0, 1} | ||
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@impl true | ||
def naive_datetime_from_iso_days(entry) do | ||
{year, month, day, hour, minute, second, microsecond} = | ||
Calendar.ISO.naive_datetime_from_iso_days(entry) | ||
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{year + 10_000, month, day, hour, minute, second, microsecond} | ||
end | ||
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@impl true | ||
def naive_datetime_to_iso_days(year, month, day, hour, minute, second, microsecond) do | ||
Calendar.ISO.naive_datetime_to_iso_days( | ||
year - 10_000, | ||
month, | ||
day, | ||
hour, | ||
minute, | ||
second, | ||
microsecond | ||
) | ||
end | ||
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defp zero_pad(val, count) when val >= 0 do | ||
String.pad_leading("#{val}", count, ["0"]) | ||
end | ||
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defp zero_pad(val, count) do | ||
"-" <> zero_pad(-val, count) | ||
end | ||
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@impl true | ||
def parse_date(string) do | ||
{year, month, day} = | ||
string | ||
|> String.split("-") | ||
|> Enum.map(&String.to_integer/1) | ||
|> List.to_tuple() | ||
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if valid_date?(year, month, day) do | ||
{:ok, {year, month, day}} | ||
else | ||
{:error, :invalid_date} | ||
end | ||
end | ||
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@impl true | ||
def valid_date?(year, month, day) do | ||
:calendar.valid_date(year, month, day) | ||
end | ||
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@impl true | ||
def months_in_year(year) do | ||
Calendar.ISO.months_in_year(year - 10_000) | ||
end | ||
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@impl true | ||
def days_in_month(year, month) do | ||
Calendar.ISO.days_in_month(year - 10_000, month) | ||
end | ||
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@impl true | ||
def leap_year?(year) do | ||
Calendar.ISO.leap_year?(year - 10_000) | ||
end | ||
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@impl true | ||
def day_of_week(year, month, day, starting_on) do | ||
Calendar.ISO.day_of_week(year - 10_000, month, day, starting_on) | ||
end | ||
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@impl true | ||
def day_of_year(year, month, day) do | ||
Calendar.ISO.day_of_year(year - 10_000, month, day) | ||
end | ||
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@impl true | ||
def quarter_of_year(year, month, day) do | ||
Calendar.ISO.quarter_of_year(year - 10_000, month, day) | ||
end | ||
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@impl true | ||
def year_of_era(year, month, day) do | ||
Calendar.ISO.year_of_era(year - 10_000, month, day) | ||
end | ||
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@impl true | ||
def day_of_era(year, month, day) do | ||
Calendar.ISO.day_of_era(year - 10_000, month, day) | ||
end | ||
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@impl true | ||
defdelegate parse_time(string), to: Calendar.ISO | ||
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@impl true | ||
defdelegate parse_naive_datetime(string), to: Calendar.ISO | ||
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@impl true | ||
defdelegate parse_utc_datetime(string), to: Calendar.ISO | ||
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@impl true | ||
defdelegate time_from_day_fraction(day_fraction), to: Calendar.ISO | ||
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@impl true | ||
defdelegate time_to_day_fraction(hour, minute, second, microsecond), to: Calendar.ISO | ||
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@impl true | ||
defdelegate valid_time?(hour, minute, second, microsecond), to: Calendar.ISO | ||
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@impl true | ||
defdelegate iso_days_to_beginning_of_day(iso_days), to: Calendar.ISO | ||
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@impl true | ||
defdelegate iso_days_to_end_of_day(iso_days), to: Calendar.ISO | ||
end |