1 files changed, 91 insertions, 0 deletions
diff --git a/spec/ruby/core/time/strftime_spec.rb b/spec/ruby/core/time/strftime_spec.rb
new file mode 100644
index 0000000000..1528a668a1
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+++ b/spec/ruby/core/time/strftime_spec.rb
@@ -0,0 +1,91 @@
+# encoding: utf-8
+
+require_relative '../../spec_helper'
+require_relative '../../shared/time/strftime_for_date'
+require_relative '../../shared/time/strftime_for_time'
+
+describe "Time#strftime" do
+  before :all do
+    @new_date = -> y, m, d { Time.gm(y,m,d) }
+    @new_time = -> *args { Time.gm(*args) }
+    @new_time_in_zone = -> zone, offset, *args {
+      with_timezone(zone, offset) do
+        Time.new(*args)
+      end
+    }
+    @new_time_with_offset = -> y, m, d, h, min, s, offset {
+      Time.new(y,m,d,h,min,s,offset)
+    }
+
+    @time = @new_time[2001, 2, 3, 4, 5, 6]
+  end
+
+  it_behaves_like :strftime_date, :strftime
+  it_behaves_like :strftime_time, :strftime
+
+  # Differences with date
+  it "requires an argument" do
+    -> { @time.strftime }.should.raise(ArgumentError)
+  end
+
+  # %Z is zone name or empty for Time
+  it "should be able to show the timezone if available" do
+    @time.strftime("%Z").should == @time.zone
+    with_timezone("UTC", 0) do
+      Time.gm(2000).strftime("%Z").should == "UTC"
+    end
+
+    Time.new(2000, 1, 1, 0, 0, 0, 42).strftime("%Z").should == ""
+  end
+
+  # %v is %e-%^b-%Y for Time
+  it "should be able to show the commercial week" do
+    @time.strftime("%v").should == " 3-FEB-2001"
+    @time.strftime("%v").should == @time.strftime('%e-%^b-%Y')
+  end
+
+  # Date/DateTime round at creation time, but Time does it in strftime.
+  it "rounds an offset to the nearest second when formatting with %z" do
+    time = @new_time_with_offset[2012, 1, 1, 0, 0, 0, Rational(36645, 10)]
+    time.strftime("%::z").should == "+01:01:05"
+  end
+
+  it "supports RFC 3339 UTC for unknown offset local time, -0000, as %-z" do
+    time = Time.gm(2022)
+
+    time.strftime("%z").should == "+0000"
+    time.strftime("%-z").should == "-0000"
+    time.strftime("%-:z").should == "-00:00"
+    time.strftime("%-::z").should == "-00:00:00"
+  end
+
+  it "applies '-' flag to UTC time" do
+    time = Time.utc(2022)
+    time.strftime("%-z").should == "-0000"
+
+    time = Time.gm(2022)
+    time.strftime("%-z").should == "-0000"
+
+    time = Time.new(2022, 1, 1, 0, 0, 0, "Z")
+    time.strftime("%-z").should == "-0000"
+
+    time = Time.new(2022, 1, 1, 0, 0, 0, "-00:00")
+    time.strftime("%-z").should == "-0000"
+
+    time = Time.new(2022, 1, 1, 0, 0, 0, "+03:00").utc
+    time.strftime("%-z").should == "-0000"
+  end
+
+  it "ignores '-' flag for non-UTC time" do
+    time = Time.new(2022, 1, 1, 0, 0, 0, "+03:00")
+    time.strftime("%-z").should == "+0300"
+  end
+
+  it "works correctly with width, _ and 0 flags, and :" do
+    Time.now.utc.strftime("%-_10z").should == "      -000"
+    Time.now.utc.strftime("%-10z").should == "-000000000"
+    Time.now.utc.strftime("%-010:z").should == "-000000:00"
+    Time.now.utc.strftime("%-_10:z").should == "     -0:00"
+    Time.now.utc.strftime("%-_10::z").should == "  -0:00:00"
+  end
+end