Merge pull request #2259 from herwinw/time_to_date

Implement Time#to_date

lib/time.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class Time
+  def to_date
+    require 'date'
+
+    Date.new(year, month, mday)
+  end
+end

spec/library/date/time/to_date_spec.rb

@@ -0,0 +1,48 @@
+
+require_relative '../../../spec_helper'
+require 'time'
+
+describe "Time#to_date" do
+  it "yields accurate julian date for ambiguous pre-Gregorian reform value" do
+    NATFIXME 'yields accurate julian date for ambiguous pre-Gregorian reform value', exception: SpecFailedException do
+      Time.utc(1582, 10, 4).to_date.jd.should == Date::ITALY - 11 # 2299150j
+    end
+  end
+
+  it "yields accurate julian date for Julian-Gregorian gap value" do
+    NATFIXME 'yields accurate julian date for Julian-Gregorian gap value', exception: Date::Error, message: 'invalid date' do
+      Time.utc(1582, 10, 14).to_date.jd.should == Date::ITALY - 1 # 2299160j
+    end
+  end
+
+  it "yields accurate julian date for post-Gregorian reform value" do
+    Time.utc(1582, 10, 15).to_date.jd.should == Date::ITALY # 2299161j
+  end
+
+  it "yields same julian day regardless of UTC time value" do
+    Time.utc(1582, 10, 15, 00, 00, 00).to_date.jd.should == Date::ITALY
+    Time.utc(1582, 10, 15, 23, 59, 59).to_date.jd.should == Date::ITALY
+  end
+
+  it "yields same julian day regardless of local time or zone" do
+
+    with_timezone("Pacific/Pago_Pago", -11) do
+      Time.local(1582, 10, 15, 00, 00, 00).to_date.jd.should == Date::ITALY
+      Time.local(1582, 10, 15, 23, 59, 59).to_date.jd.should == Date::ITALY
+    end
+
+    with_timezone("Asia/Kamchatka", +12) do
+      Time.local(1582, 10, 15, 00, 00, 00).to_date.jd.should == Date::ITALY
+      Time.local(1582, 10, 15, 23, 59, 59).to_date.jd.should == Date::ITALY
+    end
+
+  end
+
+  it "yields date with default Calendar reform day" do
+    Time.utc(1582, 10,  4).to_date.start.should == Date::ITALY
+    NATFIXME 'yields date with default Calendar reform day', exception: Date::Error, message: 'invalid date' do
+      Time.utc(1582, 10, 14).to_date.start.should == Date::ITALY
+    end
+    Time.utc(1582, 10, 15).to_date.start.should == Date::ITALY
+  end
+end