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    <h3>Editing: jquery.flot.time.js</h3>
    <textarea name="content" rows="20" cols="80">/* Pretty handling of time axes.

Copyright (c) 2007-2014 IOLA and Ole Laursen.
Licensed under the MIT license.

Set axis.mode to &quot;time&quot; to enable. See the section &quot;Time series data&quot; in
API.txt for details.

*/

(function($) {

	var options = {
		xaxis: {
			timezone: null,		// &quot;browser&quot; for local to the client or timezone for timezone-js
			timeformat: null,	// format string to use
			twelveHourClock: false,	// 12 or 24 time in time mode
			monthNames: null	// list of names of months
		}
	};

	// round to nearby lower multiple of base

	function floorInBase(n, base) {
		return base * Math.floor(n / base);
	}

	// Returns a string with the date d formatted according to fmt.
	// A subset of the Open Group's strftime format is supported.

	function formatDate(d, fmt, monthNames, dayNames) {

		if (typeof d.strftime == &quot;function&quot;) {
			return d.strftime(fmt);
		}

		var leftPad = function(n, pad) {
			n = &quot;&quot; + n;
			pad = &quot;&quot; + (pad == null ? &quot;0&quot; : pad);
			return n.length == 1 ? pad + n : n;
		};

		var r = [];
		var escape = false;
		var hours = d.getHours();
		var isAM = hours &lt; 12;

		if (monthNames == null) {
			monthNames = [&quot;Jan&quot;, &quot;Feb&quot;, &quot;Mar&quot;, &quot;Apr&quot;, &quot;May&quot;, &quot;Jun&quot;, &quot;Jul&quot;, &quot;Aug&quot;, &quot;Sep&quot;, &quot;Oct&quot;, &quot;Nov&quot;, &quot;Dec&quot;];
		}

		if (dayNames == null) {
			dayNames = [&quot;Sun&quot;, &quot;Mon&quot;, &quot;Tue&quot;, &quot;Wed&quot;, &quot;Thu&quot;, &quot;Fri&quot;, &quot;Sat&quot;];
		}

		var hours12;

		if (hours &gt; 12) {
			hours12 = hours - 12;
		} else if (hours == 0) {
			hours12 = 12;
		} else {
			hours12 = hours;
		}

		for (var i = 0; i &lt; fmt.length; ++i) {

			var c = fmt.charAt(i);

			if (escape) {
				switch (c) {
					case 'a': c = &quot;&quot; + dayNames[d.getDay()]; break;
					case 'b': c = &quot;&quot; + monthNames[d.getMonth()]; break;
					case 'd': c = leftPad(d.getDate()); break;
					case 'e': c = leftPad(d.getDate(), &quot; &quot;); break;
					case 'h':	// For back-compat with 0.7; remove in 1.0
					case 'H': c = leftPad(hours); break;
					case 'I': c = leftPad(hours12); break;
					case 'l': c = leftPad(hours12, &quot; &quot;); break;
					case 'm': c = leftPad(d.getMonth() + 1); break;
					case 'M': c = leftPad(d.getMinutes()); break;
					// quarters not in Open Group's strftime specification
					case 'q':
						c = &quot;&quot; + (Math.floor(d.getMonth() / 3) + 1); break;
					case 'S': c = leftPad(d.getSeconds()); break;
					case 'y': c = leftPad(d.getFullYear() % 100); break;
					case 'Y': c = &quot;&quot; + d.getFullYear(); break;
					case 'p': c = (isAM) ? (&quot;&quot; + &quot;am&quot;) : (&quot;&quot; + &quot;pm&quot;); break;
					case 'P': c = (isAM) ? (&quot;&quot; + &quot;AM&quot;) : (&quot;&quot; + &quot;PM&quot;); break;
					case 'w': c = &quot;&quot; + d.getDay(); break;
				}
				r.push(c);
				escape = false;
			} else {
				if (c == &quot;%&quot;) {
					escape = true;
				} else {
					r.push(c);
				}
			}
		}

		return r.join(&quot;&quot;);
	}

	// To have a consistent view of time-based data independent of which time
	// zone the client happens to be in we need a date-like object independent
	// of time zones.  This is done through a wrapper that only calls the UTC
	// versions of the accessor methods.

	function makeUtcWrapper(d) {

		function addProxyMethod(sourceObj, sourceMethod, targetObj, targetMethod) {
			sourceObj[sourceMethod] = function() {
				return targetObj[targetMethod].apply(targetObj, arguments);
			};
		};

		var utc = {
			date: d
		};

		// support strftime, if found

		if (d.strftime != undefined) {
			addProxyMethod(utc, &quot;strftime&quot;, d, &quot;strftime&quot;);
		}

		addProxyMethod(utc, &quot;getTime&quot;, d, &quot;getTime&quot;);
		addProxyMethod(utc, &quot;setTime&quot;, d, &quot;setTime&quot;);

		var props = [&quot;Date&quot;, &quot;Day&quot;, &quot;FullYear&quot;, &quot;Hours&quot;, &quot;Milliseconds&quot;, &quot;Minutes&quot;, &quot;Month&quot;, &quot;Seconds&quot;];

		for (var p = 0; p &lt; props.length; p++) {
			addProxyMethod(utc, &quot;get&quot; + props[p], d, &quot;getUTC&quot; + props[p]);
			addProxyMethod(utc, &quot;set&quot; + props[p], d, &quot;setUTC&quot; + props[p]);
		}

		return utc;
	};

	// select time zone strategy.  This returns a date-like object tied to the
	// desired timezone

	function dateGenerator(ts, opts) {
		if (opts.timezone == &quot;browser&quot;) {
			return new Date(ts);
		} else if (!opts.timezone || opts.timezone == &quot;utc&quot;) {
			return makeUtcWrapper(new Date(ts));
		} else if (typeof timezoneJS != &quot;undefined&quot; &amp;&amp; typeof timezoneJS.Date != &quot;undefined&quot;) {
			var d = new timezoneJS.Date();
			// timezone-js is fickle, so be sure to set the time zone before
			// setting the time.
			d.setTimezone(opts.timezone);
			d.setTime(ts);
			return d;
		} else {
			return makeUtcWrapper(new Date(ts));
		}
	}
	
	// map of app. size of time units in milliseconds

	var timeUnitSize = {
		&quot;second&quot;: 1000,
		&quot;minute&quot;: 60 * 1000,
		&quot;hour&quot;: 60 * 60 * 1000,
		&quot;day&quot;: 24 * 60 * 60 * 1000,
		&quot;month&quot;: 30 * 24 * 60 * 60 * 1000,
		&quot;quarter&quot;: 3 * 30 * 24 * 60 * 60 * 1000,
		&quot;year&quot;: 365.2425 * 24 * 60 * 60 * 1000
	};

	// the allowed tick sizes, after 1 year we use
	// an integer algorithm

	var baseSpec = [
		[1, &quot;second&quot;], [2, &quot;second&quot;], [5, &quot;second&quot;], [10, &quot;second&quot;],
		[30, &quot;second&quot;], 
		[1, &quot;minute&quot;], [2, &quot;minute&quot;], [5, &quot;minute&quot;], [10, &quot;minute&quot;],
		[30, &quot;minute&quot;], 
		[1, &quot;hour&quot;], [2, &quot;hour&quot;], [4, &quot;hour&quot;],
		[8, &quot;hour&quot;], [12, &quot;hour&quot;],
		[1, &quot;day&quot;], [2, &quot;day&quot;], [3, &quot;day&quot;],
		[0.25, &quot;month&quot;], [0.5, &quot;month&quot;], [1, &quot;month&quot;],
		[2, &quot;month&quot;]
	];

	// we don't know which variant(s) we'll need yet, but generating both is
	// cheap

	var specMonths = baseSpec.concat([[3, &quot;month&quot;], [6, &quot;month&quot;],
		[1, &quot;year&quot;]]);
	var specQuarters = baseSpec.concat([[1, &quot;quarter&quot;], [2, &quot;quarter&quot;],
		[1, &quot;year&quot;]]);

	function init(plot) {
		plot.hooks.processOptions.push(function (plot, options) {
			$.each(plot.getAxes(), function(axisName, axis) {

				var opts = axis.options;

				if (opts.mode == &quot;time&quot;) {
					axis.tickGenerator = function(axis) {

						var ticks = [];
						var d = dateGenerator(axis.min, opts);
						var minSize = 0;

						// make quarter use a possibility if quarters are
						// mentioned in either of these options

						var spec = (opts.tickSize &amp;&amp; opts.tickSize[1] ===
							&quot;quarter&quot;) ||
							(opts.minTickSize &amp;&amp; opts.minTickSize[1] ===
							&quot;quarter&quot;) ? specQuarters : specMonths;

						if (opts.minTickSize != null) {
							if (typeof opts.tickSize == &quot;number&quot;) {
								minSize = opts.tickSize;
							} else {
								minSize = opts.minTickSize[0] * timeUnitSize[opts.minTickSize[1]];
							}
						}

						for (var i = 0; i &lt; spec.length - 1; ++i) {
							if (axis.delta &lt; (spec[i][0] * timeUnitSize[spec[i][1]]
											  + spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
								&amp;&amp; spec[i][0] * timeUnitSize[spec[i][1]] &gt;= minSize) {
								break;
							}
						}

						var size = spec[i][0];
						var unit = spec[i][1];

						// special-case the possibility of several years

						if (unit == &quot;year&quot;) {

							// if given a minTickSize in years, just use it,
							// ensuring that it's an integer

							if (opts.minTickSize != null &amp;&amp; opts.minTickSize[1] == &quot;year&quot;) {
								size = Math.floor(opts.minTickSize[0]);
							} else {

								var magn = Math.pow(10, Math.floor(Math.log(axis.delta / timeUnitSize.year) / Math.LN10));
								var norm = (axis.delta / timeUnitSize.year) / magn;

								if (norm &lt; 1.5) {
									size = 1;
								} else if (norm &lt; 3) {
									size = 2;
								} else if (norm &lt; 7.5) {
									size = 5;
								} else {
									size = 10;
								}

								size *= magn;
							}

							// minimum size for years is 1

							if (size &lt; 1) {
								size = 1;
							}
						}

						axis.tickSize = opts.tickSize || [size, unit];
						var tickSize = axis.tickSize[0];
						unit = axis.tickSize[1];

						var step = tickSize * timeUnitSize[unit];

						if (unit == &quot;second&quot;) {
							d.setSeconds(floorInBase(d.getSeconds(), tickSize));
						} else if (unit == &quot;minute&quot;) {
							d.setMinutes(floorInBase(d.getMinutes(), tickSize));
						} else if (unit == &quot;hour&quot;) {
							d.setHours(floorInBase(d.getHours(), tickSize));
						} else if (unit == &quot;month&quot;) {
							d.setMonth(floorInBase(d.getMonth(), tickSize));
						} else if (unit == &quot;quarter&quot;) {
							d.setMonth(3 * floorInBase(d.getMonth() / 3,
								tickSize));
						} else if (unit == &quot;year&quot;) {
							d.setFullYear(floorInBase(d.getFullYear(), tickSize));
						}

						// reset smaller components

						d.setMilliseconds(0);

						if (step &gt;= timeUnitSize.minute) {
							d.setSeconds(0);
						}
						if (step &gt;= timeUnitSize.hour) {
							d.setMinutes(0);
						}
						if (step &gt;= timeUnitSize.day) {
							d.setHours(0);
						}
						if (step &gt;= timeUnitSize.day * 4) {
							d.setDate(1);
						}
						if (step &gt;= timeUnitSize.month * 2) {
							d.setMonth(floorInBase(d.getMonth(), 3));
						}
						if (step &gt;= timeUnitSize.quarter * 2) {
							d.setMonth(floorInBase(d.getMonth(), 6));
						}
						if (step &gt;= timeUnitSize.year) {
							d.setMonth(0);
						}

						var carry = 0;
						var v = Number.NaN;
						var prev;

						do {

							prev = v;
							v = d.getTime();
							ticks.push(v);

							if (unit == &quot;month&quot; || unit == &quot;quarter&quot;) {
								if (tickSize &lt; 1) {

									// a bit complicated - we'll divide the
									// month/quarter up but we need to take
									// care of fractions so we don't end up in
									// the middle of a day

									d.setDate(1);
									var start = d.getTime();
									d.setMonth(d.getMonth() +
										(unit == &quot;quarter&quot; ? 3 : 1));
									var end = d.getTime();
									d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
									carry = d.getHours();
									d.setHours(0);
								} else {
									d.setMonth(d.getMonth() +
										tickSize * (unit == &quot;quarter&quot; ? 3 : 1));
								}
							} else if (unit == &quot;year&quot;) {
								d.setFullYear(d.getFullYear() + tickSize);
							} else {
								d.setTime(v + step);
							}
						} while (v &lt; axis.max &amp;&amp; v != prev);

						return ticks;
					};

					axis.tickFormatter = function (v, axis) {

						var d = dateGenerator(v, axis.options);

						// first check global format

						if (opts.timeformat != null) {
							return formatDate(d, opts.timeformat, opts.monthNames, opts.dayNames);
						}

						// possibly use quarters if quarters are mentioned in
						// any of these places

						var useQuarters = (axis.options.tickSize &amp;&amp;
								axis.options.tickSize[1] == &quot;quarter&quot;) ||
							(axis.options.minTickSize &amp;&amp;
								axis.options.minTickSize[1] == &quot;quarter&quot;);

						var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
						var span = axis.max - axis.min;
						var suffix = (opts.twelveHourClock) ? &quot; %p&quot; : &quot;&quot;;
						var hourCode = (opts.twelveHourClock) ? &quot;%I&quot; : &quot;%H&quot;;
						var fmt;

						if (t &lt; timeUnitSize.minute) {
							fmt = hourCode + &quot;:%M:%S&quot; + suffix;
						} else if (t &lt; timeUnitSize.day) {
							if (span &lt; 2 * timeUnitSize.day) {
								fmt = hourCode + &quot;:%M&quot; + suffix;
							} else {
								fmt = &quot;%b %d &quot; + hourCode + &quot;:%M&quot; + suffix;
							}
						} else if (t &lt; timeUnitSize.month) {
							fmt = &quot;%b %d&quot;;
						} else if ((useQuarters &amp;&amp; t &lt; timeUnitSize.quarter) ||
							(!useQuarters &amp;&amp; t &lt; timeUnitSize.year)) {
							if (span &lt; timeUnitSize.year) {
								fmt = &quot;%b&quot;;
							} else {
								fmt = &quot;%b %Y&quot;;
							}
						} else if (useQuarters &amp;&amp; t &lt; timeUnitSize.year) {
							if (span &lt; timeUnitSize.year) {
								fmt = &quot;Q%q&quot;;
							} else {
								fmt = &quot;Q%q %Y&quot;;
							}
						} else {
							fmt = &quot;%Y&quot;;
						}

						var rt = formatDate(d, fmt, opts.monthNames, opts.dayNames);

						return rt;
					};
				}
			});
		});
	}

	$.plot.plugins.push({
		init: init,
		options: options,
		name: 'time',
		version: '1.0'
	});

	// Time-axis support used to be in Flot core, which exposed the
	// formatDate function on the plot object.  Various plugins depend
	// on the function, so we need to re-expose it here.

	$.plot.formatDate = formatDate;
	$.plot.dateGenerator = dateGenerator;

})(jQuery);
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