text: require("../env");
  
  var vows = require("vows"),
      assert = require("assert");
  
  var suite = vows.describe("d3.time.scale");
  
  suite.addBatch({
    "scale": {
      topic: function() {
        return d3.time.scale;
      },
  
      "copy": {
        "changes to the domain are isolated": function(scale) {
          var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]), y = x.copy();
          x.domain([local(2010, 0, 1), local(2011, 0, 1)]);
          assert.deepEqual(y.domain(), [local(2009, 0, 1), local(2010, 0, 1)]);
          assert.equal(x(local(2010, 0, 1)), 0);
          assert.equal(y(local(2010, 0, 1)), 1);
          y.domain([local(2011, 0, 1), local(2012, 0, 1)]);
          assert.equal(x(local(2011, 0, 1)), 1);
          assert.equal(y(local(2011, 0, 1)), 0);
          assert.deepEqual(x.domain(), [local(2010, 0, 1), local(2011, 0, 1)]);
          assert.deepEqual(y.domain(), [local(2011, 0, 1), local(2012, 0, 1)]);
        },
        "changes to the range are isolated": function(scale) {
          var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]), y = x.copy();
          x.range([1, 2]);
          assert.deepEqual(x.invert(1), local(2009, 0, 1));
          assert.deepEqual(y.invert(1), local(2010, 0, 1));
          assert.deepEqual(y.range(), [0, 1]);
          y.range([2, 3]);
          assert.deepEqual(x.invert(2), local(2010, 0, 1));
          assert.deepEqual(y.invert(2), local(2009, 0, 1));
          assert.deepEqual(x.range(), [1, 2]);
          assert.deepEqual(y.range(), [2, 3]);
        },
        "changes to the interpolator are isolated": function(scale) {
          var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]).range(["red", "blue"]), y = x.copy();
          x.interpolate(d3.interpolateHsl);
          assert.equal(x(local(2009, 6, 1)), "#04ff00");
          assert.equal(y(local(2009, 6, 1)), "#81007e");
          assert.equal(y.interpolate(), d3.interpolate);
        },
        "changes to clamping are isolated": function(scale) {
          var x = scale().domain([local(2009, 0, 1), local(2010, 0, 1)]).clamp(true), y = x.copy();
          x.clamp(false);
          assert.equal(x(local(2011, 0, 1)), 2);
          assert.equal(y(local(2011, 0, 1)), 1);
          assert.isTrue(y.clamp());
          y.clamp(false);
          assert.equal(x(local(2011, 0, 1)), 2);
          assert.equal(y(local(2011, 0, 1)), 2);
          assert.isFalse(x.clamp());
        }
      },
  
      "ticks": {
        "observes explicit tick interval": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 1, 0), local(2011, 0, 1, 12, 4, 4)]);
          assert.deepEqual(x.ticks(d3.time.minutes), [
            local(2011, 0, 1, 12, 1),
            local(2011, 0, 1, 12, 2),
            local(2011, 0, 1, 12, 3),
            local(2011, 0, 1, 12, 4)
          ]);
        },
        "observes explicit tick interval and step": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 33, 4)]);
          assert.deepEqual(x.ticks(d3.time.minutes, 10), [
            local(2011, 0, 1, 12, 0),
            local(2011, 0, 1, 12, 10),
            local(2011, 0, 1, 12, 20),
            local(2011, 0, 1, 12, 30)
          ]);
        },
        "generates sub-second ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 1)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 0, 0,   0),
            local(2011, 0, 1, 12, 0, 0, 200),
            local(2011, 0, 1, 12, 0, 0, 400),
            local(2011, 0, 1, 12, 0, 0, 600),
            local(2011, 0, 1, 12, 0, 0, 800),
            local(2011, 0, 1, 12, 0, 1,   0)
          ]);
        },
        "generates 1-second ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 4)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 0, 0),
            local(2011, 0, 1, 12, 0, 1),
            local(2011, 0, 1, 12, 0, 2),
            local(2011, 0, 1, 12, 0, 3),
            local(2011, 0, 1, 12, 0, 4)
          ]);
        },
        "generates 5-second ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 20)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 0, 0),
            local(2011, 0, 1, 12, 0, 5),
            local(2011, 0, 1, 12, 0, 10),
            local(2011, 0, 1, 12, 0, 15),
            local(2011, 0, 1, 12, 0, 20)
          ]);
        },
        "generates 15-second ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 0, 50)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 0, 0),
            local(2011, 0, 1, 12, 0, 15),
            local(2011, 0, 1, 12, 0, 30),
            local(2011, 0, 1, 12, 0, 45)
          ]);
        },
        "generates 30-second ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 0), local(2011, 0, 1, 12, 1, 50)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 0, 0),
            local(2011, 0, 1, 12, 0, 30),
            local(2011, 0, 1, 12, 1, 0),
            local(2011, 0, 1, 12, 1, 30)
          ]);
        },
        "generates 1-minute ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 0, 27), local(2011, 0, 1, 12, 4, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 1),
            local(2011, 0, 1, 12, 2),
            local(2011, 0, 1, 12, 3),
            local(2011, 0, 1, 12, 4)
          ]);
        },
        "generates 5-minute ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 3, 27), local(2011, 0, 1, 12, 21, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 5),
            local(2011, 0, 1, 12, 10),
            local(2011, 0, 1, 12, 15),
            local(2011, 0, 1, 12, 20)
          ]);
        },
        "generates 15-minute ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 8, 27), local(2011, 0, 1, 13, 4, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 15),
            local(2011, 0, 1, 12, 30),
            local(2011, 0, 1, 12, 45),
            local(2011, 0, 1, 13, 0)
          ]);
        },
        "generates 30-minute ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 28, 27), local(2011, 0, 1, 14, 4, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 12, 30),
            local(2011, 0, 1, 13, 0),
            local(2011, 0, 1, 13, 30),
            local(2011, 0, 1, 14, 0)
          ]);
        },
        "generates 1-hour ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 12, 28, 27), local(2011, 0, 1, 16, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 13, 0),
            local(2011, 0, 1, 14, 0),
            local(2011, 0, 1, 15, 0),
            local(2011, 0, 1, 16, 0)
          ]);
        },
        "generates 3-hour ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 14, 28, 27), local(2011, 0, 2, 1, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 15, 0),
            local(2011, 0, 1, 18, 0),
            local(2011, 0, 1, 21, 0),
            local(2011, 0, 2, 0, 0)
          ]);
        },
        "generates 6-hour ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 2, 14, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 18, 0),
            local(2011, 0, 2, 0, 0),
            local(2011, 0, 2, 6, 0),
            local(2011, 0, 2, 12, 0)
          ]);
        },
        "generates 12-hour ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 3, 21, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 2, 0, 0),
            local(2011, 0, 2, 12, 0),
            local(2011, 0, 3, 0, 0),
            local(2011, 0, 3, 12, 0)
          ]);
        },
        "generates 1-day ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 5, 21, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 2, 0, 0),
            local(2011, 0, 3, 0, 0),
            local(2011, 0, 4, 0, 0),
            local(2011, 0, 5, 0, 0)
          ]);
        },
        "generates 2-day ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 2, 16, 28, 27), local(2011, 0, 9, 21, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 3, 0, 0),
            local(2011, 0, 5, 0, 0),
            local(2011, 0, 7, 0, 0),
            local(2011, 0, 9, 0, 0)
          ]);
        },
        "generates 1-week ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 1, 16, 28, 27), local(2011, 0, 23, 21, 34, 12)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 2, 0, 0),
            local(2011, 0, 9, 0, 0),
            local(2011, 0, 16, 0, 0),
            local(2011, 0, 23, 0, 0)
          ]);
        },
        "generates 1-month ticks": function(scale) {
          var x = scale().domain([local(2011, 0, 18), local(2011, 4, 2)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 1, 1, 0, 0),
            local(2011, 2, 1, 0, 0),
            local(2011, 3, 1, 0, 0),
            local(2011, 4, 1, 0, 0)
          ]);
        },
        "generates 3-month ticks": function(scale) {
          var x = scale().domain([local(2010, 11, 18), local(2011, 10, 2)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 0, 0),
            local(2011, 3, 1, 0, 0),
            local(2011, 6, 1, 0, 0),
            local(2011, 9, 1, 0, 0)
          ]);
        },
        "generates 1-year ticks": function(scale) {
          var x = scale().domain([local(2010, 11, 18), local(2014, 2, 2)]);
          assert.deepEqual(x.ticks(4), [
            local(2011, 0, 1, 0, 0),
            local(2012, 0, 1, 0, 0),
            local(2013, 0, 1, 0, 0),
            local(2014, 0, 1, 0, 0)
          ]);
        },
        "generates multi-year ticks": function(scale) {
          var x = scale().domain([local(0, 11, 18), local(2014, 2, 2)]);
          assert.deepEqual(x.ticks(6), [
            local( 500, 0, 1, 0, 0),
            local(1000, 0, 1, 0, 0),
            local(1500, 0, 1, 0, 0),
            local(2000, 0, 1, 0, 0)
          ]);
        }
      },
  
      "tickFormat": {
        topic: function(scale) {
          return scale().tickFormat();
        },
        "formats year on New Year's": function(format) {
          assert.equal(format(local(2011, 0, 1)), "2011");
          assert.equal(format(local(2012, 0, 1)), "2012");
          assert.equal(format(local(2013, 0, 1)), "2013");
        },
        "formats month on the 1st of each month": function(format) {
          assert.equal(format(local(2011, 1, 1)), "February");
          assert.equal(format(local(2011, 2, 1)), "March");
          assert.equal(format(local(2011, 3, 1)), "April");
        },
        "formats week on Sunday midnight": function(format) {
          assert.equal(format(local(2011, 1, 6)), "Feb 06");
          assert.equal(format(local(2011, 1, 13)), "Feb 13");
          assert.equal(format(local(2011, 1, 20)), "Feb 20");
        },
        "formats date on midnight": function(format) {
          assert.equal(format(local(2011, 1, 2)), "Wed 02");
          assert.equal(format(local(2011, 1, 3)), "Thu 03");
          assert.equal(format(local(2011, 1, 4)), "Fri 04");
        },
        "formats hour on minute zero": function(format) {
          assert.equal(format(local(2011, 1, 2, 11)), "11 AM");
          assert.equal(format(local(2011, 1, 2, 12)), "12 PM");
          assert.equal(format(local(2011, 1, 2, 13)), "01 PM");
        },
        "formats minute on second zero": function(format) {
          assert.equal(format(local(2011, 1, 2, 11, 59)), "11:59");
          assert.equal(format(local(2011, 1, 2, 12,  1)), "12:01");
          assert.equal(format(local(2011, 1, 2, 12,  2)), "12:02");
        },
        "otherwise, formats second": function(format) {
          assert.equal(format(local(2011, 1, 2, 12,  1,  9)), ":09");
          assert.equal(format(local(2011, 1, 2, 12,  1, 10)), ":10");
          assert.equal(format(local(2011, 1, 2, 12,  1, 11)), ":11");
        }
      },
  
      "UTC": {
        topic: function(scale) {
          return scale.utc;
        },
  
        "ticks": {
          "observes explicit tick interval": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 1, 0), utc(2011, 0, 1, 12, 4, 4)]);
            assert.deepEqual(x.ticks(d3.time.minutes), [
              utc(2011, 0, 1, 12, 1),
              utc(2011, 0, 1, 12, 2),
              utc(2011, 0, 1, 12, 3),
              utc(2011, 0, 1, 12, 4)
            ]);
          },
          "observes explicit tick interval and step": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 33, 4)]);
            assert.deepEqual(x.ticks(d3.time.minutes, 10), [
              utc(2011, 0, 1, 12, 0),
              utc(2011, 0, 1, 12, 10),
              utc(2011, 0, 1, 12, 20),
              utc(2011, 0, 1, 12, 30)
            ]);
          },
          "generates sub-second ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 1)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 0, 0,   0),
              utc(2011, 0, 1, 12, 0, 0, 200),
              utc(2011, 0, 1, 12, 0, 0, 400),
              utc(2011, 0, 1, 12, 0, 0, 600),
              utc(2011, 0, 1, 12, 0, 0, 800),
              utc(2011, 0, 1, 12, 0, 1,   0)
            ]);
          },
          "generates 1-second ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 4)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 0, 0),
              utc(2011, 0, 1, 12, 0, 1),
              utc(2011, 0, 1, 12, 0, 2),
              utc(2011, 0, 1, 12, 0, 3),
              utc(2011, 0, 1, 12, 0, 4)
            ]);
          },
          "generates 5-second ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 20)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 0, 0),
              utc(2011, 0, 1, 12, 0, 5),
              utc(2011, 0, 1, 12, 0, 10),
              utc(2011, 0, 1, 12, 0, 15),
              utc(2011, 0, 1, 12, 0, 20)
            ]);
          },
          "generates 15-second ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 0, 50)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 0, 0),
              utc(2011, 0, 1, 12, 0, 15),
              utc(2011, 0, 1, 12, 0, 30),
              utc(2011, 0, 1, 12, 0, 45)
            ]);
          },
          "generates 30-second ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 0), utc(2011, 0, 1, 12, 1, 50)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 0, 0),
              utc(2011, 0, 1, 12, 0, 30),
              utc(2011, 0, 1, 12, 1, 0),
              utc(2011, 0, 1, 12, 1, 30)
            ]);
          },
          "generates 1-minute ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 0, 27), utc(2011, 0, 1, 12, 4, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 1),
              utc(2011, 0, 1, 12, 2),
              utc(2011, 0, 1, 12, 3),
              utc(2011, 0, 1, 12, 4)
            ]);
          },
          "generates 5-minute ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 3, 27), utc(2011, 0, 1, 12, 21, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 5),
              utc(2011, 0, 1, 12, 10),
              utc(2011, 0, 1, 12, 15),
              utc(2011, 0, 1, 12, 20)
            ]);
          },
          "generates 15-minute ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 8, 27), utc(2011, 0, 1, 13, 4, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 15),
              utc(2011, 0, 1, 12, 30),
              utc(2011, 0, 1, 12, 45),
              utc(2011, 0, 1, 13, 0)
            ]);
          },
          "generates 30-minute ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 28, 27), utc(2011, 0, 1, 14, 4, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 12, 30),
              utc(2011, 0, 1, 13, 0),
              utc(2011, 0, 1, 13, 30),
              utc(2011, 0, 1, 14, 0)
            ]);
          },
          "generates 1-hour ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 12, 28, 27), utc(2011, 0, 1, 16, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 13, 0),
              utc(2011, 0, 1, 14, 0),
              utc(2011, 0, 1, 15, 0),
              utc(2011, 0, 1, 16, 0)
            ]);
          },
          "generates 3-hour ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 14, 28, 27), utc(2011, 0, 2, 1, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 15, 0),
              utc(2011, 0, 1, 18, 0),
              utc(2011, 0, 1, 21, 0),
              utc(2011, 0, 2, 0, 0)
            ]);
          },
          "generates 6-hour ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 2, 14, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 18, 0),
              utc(2011, 0, 2, 0, 0),
              utc(2011, 0, 2, 6, 0),
              utc(2011, 0, 2, 12, 0)
            ]);
          },
          "generates 12-hour ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 3, 21, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 2, 0, 0),
              utc(2011, 0, 2, 12, 0),
              utc(2011, 0, 3, 0, 0),
              utc(2011, 0, 3, 12, 0)
            ]);
          },
          "generates 1-day ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 5, 21, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 2, 0, 0),
              utc(2011, 0, 3, 0, 0),
              utc(2011, 0, 4, 0, 0),
              utc(2011, 0, 5, 0, 0)
            ]);
          },
          "generates 2-day ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 2, 16, 28, 27), utc(2011, 0, 9, 21, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 3, 0, 0),
              utc(2011, 0, 5, 0, 0),
              utc(2011, 0, 7, 0, 0),
              utc(2011, 0, 9, 0, 0)
            ]);
          },
          "generates 1-week ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 1, 16, 28, 27), utc(2011, 0, 23, 21, 34, 12)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 2, 0, 0),
              utc(2011, 0, 9, 0, 0),
              utc(2011, 0, 16, 0, 0),
              utc(2011, 0, 23, 0, 0)
            ]);
          },
          "generates 1-month ticks": function(scale) {
            var x = scale().domain([utc(2011, 0, 18), utc(2011, 4, 2)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 1, 1, 0, 0),
              utc(2011, 2, 1, 0, 0),
              utc(2011, 3, 1, 0, 0),
              utc(2011, 4, 1, 0, 0)
            ]);
          },
          "generates 3-month ticks": function(scale) {
            var x = scale().domain([utc(2010, 11, 18), utc(2011, 10, 2)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 0, 0),
              utc(2011, 3, 1, 0, 0),
              utc(2011, 6, 1, 0, 0),
              utc(2011, 9, 1, 0, 0)
            ]);
          },
          "generates 1-year ticks": function(scale) {
            var x = scale().domain([utc(2010, 11, 18), utc(2014, 2, 2)]);
            assert.deepEqual(x.ticks(4), [
              utc(2011, 0, 1, 0, 0),
              utc(2012, 0, 1, 0, 0),
              utc(2013, 0, 1, 0, 0),
              utc(2014, 0, 1, 0, 0)
            ]);
          },
          "generates multi-year ticks": function(scale) {
            var x = scale().domain([utc(0, 11, 18), utc(2014, 2, 2)]);
            assert.deepEqual(x.ticks(6), [
              utc( 500, 0, 1, 0, 0),
              utc(1000, 0, 1, 0, 0),
              utc(1500, 0, 1, 0, 0),
              utc(2000, 0, 1, 0, 0)
            ]);
          }
        },
  
        "tickFormat": {
          topic: function(scale) {
            return scale().tickFormat();
          },
          "formats year on New Year's": function(format) {
            assert.equal(format(utc(2011, 0, 1)), "2011");
            assert.equal(format(utc(2012, 0, 1)), "2012");
            assert.equal(format(utc(2013, 0, 1)), "2013");
          },
          "formats month on the 1st of each month": function(format) {
            assert.equal(format(utc(2011, 1, 1)), "February");
            assert.equal(format(utc(2011, 2, 1)), "March");
            assert.equal(format(utc(2011, 3, 1)), "April");
          },
          "formats week on Sunday midnight": function(format) {
            assert.equal(format(utc(2011, 1, 6)), "Feb 06");
            assert.equal(format(utc(2011, 1, 13)), "Feb 13");
            assert.equal(format(utc(2011, 1, 20)), "Feb 20");
          },
          "formats date on midnight": function(format) {
            assert.equal(format(utc(2011, 1, 2)), "Wed 02");
            assert.equal(format(utc(2011, 1, 3)), "Thu 03");
            assert.equal(format(utc(2011, 1, 4)), "Fri 04");
          },
          "formats hour on minute zero": function(format) {
            assert.equal(format(utc(2011, 1, 2, 11)), "11 AM");
            assert.equal(format(utc(2011, 1, 2, 12)), "12 PM");
            assert.equal(format(utc(2011, 1, 2, 13)), "01 PM");
          },
          "formats minute on second zero": function(format) {
            assert.equal(format(utc(2011, 1, 2, 11, 59)), "11:59");
            assert.equal(format(utc(2011, 1, 2, 12,  1)), "12:01");
            assert.equal(format(utc(2011, 1, 2, 12,  2)), "12:02");
          },
          "formats second on millisecond zero": function(format) {
            assert.equal(format(utc(2011, 1, 2, 12,  1,  9)), ":09");
            assert.equal(format(utc(2011, 1, 2, 12,  1, 10)), ":10");
            assert.equal(format(utc(2011, 1, 2, 12,  1, 11)), ":11");
          },
          "otherwise, formats milliseconds": function(format) {
            assert.equal(format(utc(2011, 1, 2, 12,  1,  0,   9)), ".009");
            assert.equal(format(utc(2011, 1, 2, 12,  1,  0,  10)), ".010");
            assert.equal(format(utc(2011, 1, 2, 12,  1,  0,  11)), ".011");
          }
        }
      }
    }
  });
  
  function local(year, month, day, hours, minutes, seconds, milliseconds) {
    var date = new Date(year, month, day, hours || 0, minutes || 0, seconds || 0, milliseconds || 0);
    date.setFullYear(year); // Y2K fail
    return date;
  }
  
  function utc(year, month, day, hours, minutes, seconds, milliseconds) {
    var date = new Date(Date.UTC(year, month, day, hours || 0, minutes || 0, seconds || 0, milliseconds || 0));
    date.setUTCFullYear(year); // Y2K fail
    return date;
  }
  
  suite.export(module);
  