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d3.time.format = function(template) {
  var n = template.length;

  function format(date) {
    var string = [],
        i = -1,
        j = 0,
        c,
        p,
        f;
    while (++i < n) {
      if (template.charCodeAt(i) === 37) {
        string.push(template.substring(j, i));
        if ((p = d3_time_formatPads[c = template.charAt(++i)]) != null) c = template.charAt(++i);
        if (f = d3_time_formats[c]) c = f(date, p == null ? (c === "e" ? " " : "0") : p);
        string.push(c);
        j = i + 1;
      }
    }
    string.push(template.substring(j, i));
    return string.join("");
  }

  format.parse = function(string) {
    var d = {y: 1900, m: 0, d: 1, H: 0, M: 0, S: 0, L: 0},
        i = d3_time_parse(d, template, string, 0);
    if (i != string.length) return null;

    // The am-pm flag is 0 for AM, and 1 for PM.
    if ("p" in d) d.H = d.H % 12 + d.p * 12;

    var date = new d3_time();
    date.setFullYear(d.y, d.m, d.d);
    date.setHours(d.H, d.M, d.S, d.L);
    return date;
  };

  format.toString = function() {
    return template;
  };

  return format;
};

function d3_time_parse(date, template, string, j) {
  var c,
      p,
      i = 0,
      n = template.length,
      m = string.length;
  while (i < n) {
    if (j >= m) return -1;
    c = template.charCodeAt(i++);
    if (c === 37) {
      p = d3_time_parsers[template.charAt(i++)];
      if (!p || ((j = p(date, string, j)) < 0)) return -1;
    } else if (c != string.charCodeAt(j++)) {
      return -1;
    }
  }
  return j;
}

function d3_time_formatRe(names) {
  return new RegExp("^(?:" + names.map(d3.requote).join("|") + ")", "i");
}

function d3_time_formatLookup(names) {
  var map = new d3_Map, i = -1, n = names.length;
  while (++i < n) map.set(names[i].toLowerCase(), i);
  return map;
}

function d3_time_formatPad(value, fill, width) {
  value += "";
  var length = value.length;
  return length < width ? new Array(width - length + 1).join(fill) + value : value;
}

var d3_time_dayRe = d3_time_formatRe(d3_time_days),
    d3_time_dayAbbrevRe = d3_time_formatRe(d3_time_dayAbbreviations),
    d3_time_monthRe = d3_time_formatRe(d3_time_months),
    d3_time_monthLookup = d3_time_formatLookup(d3_time_months),
    d3_time_monthAbbrevRe = d3_time_formatRe(d3_time_monthAbbreviations),
    d3_time_monthAbbrevLookup = d3_time_formatLookup(d3_time_monthAbbreviations);

var d3_time_formatPads = {
  "-": "",
  "_": " ",
  "0": "0"
};

var d3_time_formats = {
  a: function(d) { return d3_time_dayAbbreviations[d.getDay()]; },
  A: function(d) { return d3_time_days[d.getDay()]; },
  b: function(d) { return d3_time_monthAbbreviations[d.getMonth()]; },
  B: function(d) { return d3_time_months[d.getMonth()]; },
  c: d3.time.format(d3_time_formatDateTime),
  d: function(d, p) { return d3_time_formatPad(d.getDate(), p, 2); },
  e: function(d, p) { return d3_time_formatPad(d.getDate(), p, 2); },
  H: function(d, p) { return d3_time_formatPad(d.getHours(), p, 2); },
  I: function(d, p) { return d3_time_formatPad(d.getHours() % 12 || 12, p, 2); },
  j: function(d, p) { return d3_time_formatPad(1 + d3.time.dayOfYear(d), p, 3); },
  L: function(d, p) { return d3_time_formatPad(d.getMilliseconds(), p, 3); },
  m: function(d, p) { return d3_time_formatPad(d.getMonth() + 1, p, 2); },
  M: function(d, p) { return d3_time_formatPad(d.getMinutes(), p, 2); },
  p: function(d) { return d.getHours() >= 12 ? "PM" : "AM"; },
  S: function(d, p) { return d3_time_formatPad(d.getSeconds(), p, 2); },
  U: function(d, p) { return d3_time_formatPad(d3.time.sundayOfYear(d), p, 2); },
  w: function(d) { return d.getDay(); },
  W: function(d, p) { return d3_time_formatPad(d3.time.mondayOfYear(d), p, 2); },
  x: d3.time.format(d3_time_formatDate),
  X: d3.time.format(d3_time_formatTime),
  y: function(d, p) { return d3_time_formatPad(d.getFullYear() % 100, p, 2); },
  Y: function(d, p) { return d3_time_formatPad(d.getFullYear() % 10000, p, 4); },
  Z: d3_time_zone,
  "%": function() { return "%"; }
};

var d3_time_parsers = {
  a: d3_time_parseWeekdayAbbrev,
  A: d3_time_parseWeekday,
  b: d3_time_parseMonthAbbrev,
  B: d3_time_parseMonth,
  c: d3_time_parseLocaleFull,
  d: d3_time_parseDay,
  e: d3_time_parseDay,
  H: d3_time_parseHour24,
  I: d3_time_parseHour24,
  // j: function(d, s, i) { /*TODO day of year [001,366] */ return i; },
  L: d3_time_parseMilliseconds,
  m: d3_time_parseMonthNumber,
  M: d3_time_parseMinutes,
  p: d3_time_parseAmPm,
  S: d3_time_parseSeconds,
  // U: function(d, s, i) { /*TODO week number (sunday) [00,53] */ return i; },
  // w: function(d, s, i) { /*TODO weekday [0,6] */ return i; },
  // W: function(d, s, i) { /*TODO week number (monday) [00,53] */ return i; },
  x: d3_time_parseLocaleDate,
  X: d3_time_parseLocaleTime,
  y: d3_time_parseYear,
  Y: d3_time_parseFullYear
  // ,
  // Z: function(d, s, i) { /*TODO time zone */ return i; },
  // "%": function(d, s, i) { /*TODO literal % */ return i; }
};

// Note: weekday is validated, but does not set the date.
function d3_time_parseWeekdayAbbrev(date, string, i) {
  d3_time_dayAbbrevRe.lastIndex = 0;
  var n = d3_time_dayAbbrevRe.exec(string.substring(i));
  return n ? i += n[0].length : -1;
}

// Note: weekday is validated, but does not set the date.
function d3_time_parseWeekday(date, string, i) {
  d3_time_dayRe.lastIndex = 0;
  var n = d3_time_dayRe.exec(string.substring(i));
  return n ? i += n[0].length : -1;
}

function d3_time_parseMonthAbbrev(date, string, i) {
  d3_time_monthAbbrevRe.lastIndex = 0;
  var n = d3_time_monthAbbrevRe.exec(string.substring(i));
  return n ? (date.m = d3_time_monthAbbrevLookup.get(n[0].toLowerCase()), i += n[0].length) : -1;
}

function d3_time_parseMonth(date, string, i) {
  d3_time_monthRe.lastIndex = 0;
  var n = d3_time_monthRe.exec(string.substring(i));
  return n ? (date.m = d3_time_monthLookup.get(n[0].toLowerCase()), i += n[0].length) : -1;
}

function d3_time_parseLocaleFull(date, string, i) {
  return d3_time_parse(date, d3_time_formats.c.toString(), string, i);
}

function d3_time_parseLocaleDate(date, string, i) {
  return d3_time_parse(date, d3_time_formats.x.toString(), string, i);
}

function d3_time_parseLocaleTime(date, string, i) {
  return d3_time_parse(date, d3_time_formats.X.toString(), string, i);
}

function d3_time_parseFullYear(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 4));
  return n ? (date.y = +n[0], i += n[0].length) : -1;
}

function d3_time_parseYear(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
  return n ? (date.y = d3_time_expandYear(+n[0]), i += n[0].length) : -1;
}

function d3_time_expandYear(d) {
  return d + (d > 68 ? 1900 : 2000);
}

function d3_time_parseMonthNumber(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
  return n ? (date.m = n[0] - 1, i += n[0].length) : -1;
}

function d3_time_parseDay(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
  return n ? (date.d = +n[0], i += n[0].length) : -1;
}

// Note: we don't validate that the hour is in the range [0,23] or [1,12].
function d3_time_parseHour24(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
  return n ? (date.H = +n[0], i += n[0].length) : -1;
}

function d3_time_parseMinutes(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
  return n ? (date.M = +n[0], i += n[0].length) : -1;
}

function d3_time_parseSeconds(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
  return n ? (date.S = +n[0], i += n[0].length) : -1;
}

function d3_time_parseMilliseconds(date, string, i) {
  d3_time_numberRe.lastIndex = 0;
  var n = d3_time_numberRe.exec(string.substring(i, i + 3));
  return n ? (date.L = +n[0], i += n[0].length) : -1;
}

// Note: we don't look at the next directive.
var d3_time_numberRe = /^\s*\d+/;

function d3_time_parseAmPm(date, string, i) {
  var n = d3_time_amPmLookup.get(string.substring(i, i += 2).toLowerCase());
  return n == null ? -1 : (date.p = n, i);
}

var d3_time_amPmLookup = d3.map({
  am: 0,
  pm: 1
});

// TODO table of time zone offset names?
function d3_time_zone(d) {
  var z = d.getTimezoneOffset(),
      zs = z > 0 ? "-" : "+",
      zh = ~~(Math.abs(z) / 60),
      zm = Math.abs(z) % 60;
  return zs + d3_time_formatPad(zh, "0", 2) + d3_time_formatPad(zm, "0", 2);
}
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