Merge pull request #5 from kachick/fix-parser-handles-milliseconds

Fix to handle timestamp precision in parser

(huge thanks to @kachick!)

Author: abachman

lib/ulid/parse.rb

@@ -51,7 +51,7 @@ def unpack_decoded_bytes(packed_bytes)
         (time_bytes[1].to_i << 32) |
         (time_bytes[0].to_i << 40)
 
-      [ Time.at( time_int * 0.001 ).utc, seed ]
+      [ Time.at( time_int * 1/1000r ).utc, seed ]
     end
 
   end

spec/ulid_spec.rb

@@ -34,12 +34,13 @@
     end
 
     it 'returns same time that was used to generate it' do
-      # NOTE: we may not get the PRECISE time out due to conversion from
-      # Time -> Float -> Base32 -> Float -> Time
-      #
-      # It's not immediately clear to me whether that's a function of Ruby
-      # or of the format.
-      expect(ulid_time).to be_within(0.001).of(KNOWN_TIME)
+      expect(ulid_time).to eq(KNOWN_TIME)
+    end
+
+    it 'handles timestamp as the milliseconds precision' do
+      time = ULID.time('0A000000000000000000000000')
+      expect(time.to_i).to eq(10995116277)
+      expect(time.nsec).to eq(760000000)
     end
   end