Release 1.0.0-alpha3

bower.json

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+{
+  "name": "chartjs-adapter-date-fns",
+  "description": "Chart.js adapter to use date-fns for time functionalities",
+  "homepage": "https://www.chartjs.org",
+  "license": "MIT",
+  "version": "1.0.0-alpha3",
+  "main": "dist/chartjs-adapter-date-fns.js"
+}

dist/chartjs-adapter-date-fns.js

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+/*!
+ * chartjs-adapter-date-fns v1.0.0-alpha3
+ * https://www.chartjs.org
+ * (c) 2019 Chart.js Contributors
+ * Released under the MIT license
+ */
+(function (global, factory) {
+typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('chart.js'), require('date-fns')) :
+typeof define === 'function' && define.amd ? define(['chart.js', 'date-fns'], factory) :
+(global = global || self, factory(global.Chart, global.dateFns));
+}(this, (function (chart_js, dateFns) { 'use strict';
+
+var FORMATS = {
+	datetime: 'MMM d, yyyy, h:mm:ss aaaa',
+	millisecond: 'h:mm:ss.SSS aaaa',
+	second: 'h:mm:ss aaaa',
+	minute: 'h:mm aaaa',
+	hour: 'ha',
+	day: 'MMM d',
+	week: 'PP',
+	month: 'MMM yyyy',
+	quarter: 'qqq - yyyy',
+	year: 'yyyy'
+};
+
+chart_js._adapters._date.override({
+	_id: 'date-fns', // DEBUG
+
+	formats: function() {
+		return FORMATS;
+	},
+
+	parse: function(value, fmt) {
+		if (chart_js.helpers.isNullOrUndef(value)) {
+			return null;
+		}
+		var type = typeof value;
+		if (type === 'number' || value instanceof Date) {
+			value = dateFns.toDate(value);
+		} else if (type === 'string') {
+			if (typeof fmt === 'string') {
+				value = dateFns.parse(value, fmt, new Date(), this.options);
+			} else {
+				value = dateFns.parseISO(value, this.options);
+			}
+		}
+		return dateFns.isValid(value) ? value.getTime() : null;
+	},
+
+	format: function(time, fmt) {
+		return dateFns.format(time, fmt, this.options);
+	},
+
+	add: function(time, amount, unit) {
+		switch (unit) {
+		case 'millisecond': return dateFns.addMilliseconds(time, amount);
+		case 'second': return dateFns.addSeconds(time, amount);
+		case 'minute': return dateFns.addMinutes(time, amount);
+		case 'hour': return dateFns.addHours(time, amount);
+		case 'day': return dateFns.addDays(time, amount);
+		case 'week': return dateFns.addWeeks(time, amount);
+		case 'month': return dateFns.addMonths(time, amount);
+		case 'quarter': return dateFns.addQuarters(time, amount);
+		case 'year': return dateFns.addYears(time, amount);
+		default: return time;
+		}
+	},
+
+	diff: function(max, min, unit) {
+		switch (unit) {
+		case 'millisecond': return dateFns.differenceInMilliseconds(max, min);
+		case 'second': return dateFns.differenceInSeconds(max, min);
+		case 'minute': return dateFns.differenceInMinutes(max, min);
+		case 'hour': return dateFns.differenceInHours(max, min);
+		case 'day': return dateFns.differenceInDays(max, min);
+		case 'week': return dateFns.differenceInWeeks(max, min);
+		case 'month': return dateFns.differenceInMonths(max, min);
+		case 'quarter': return dateFns.differenceInQuarters(max, min);
+		case 'year': return dateFns.differenceInYears(max, min);
+		default: return 0;
+		}
+	},
+
+	startOf: function(time, unit, weekday) {
+		switch (unit) {
+		case 'second': return dateFns.startOfSecond(time);
+		case 'minute': return dateFns.startOfMinute(time);
+		case 'hour': return dateFns.startOfHour(time);
+		case 'day': return dateFns.startOfDay(time);
+		case 'week': return dateFns.startOfWeek(time);
+		case 'isoWeek': return dateFns.startOfWeek(time, { weekStartsOn: +weekday });
+		case 'month': return dateFns.startOfMonth(time);
+		case 'quarter': return dateFns.startOfQuarter(time);
+		case 'year': return dateFns.startOfYear(time);
+		default: return time;
+		}
+	},
+
+	endOf: function(time, unit) {
+		switch (unit) {
+		case 'second': return dateFns.endOfSecond(time);
+		case 'minute': return dateFns.endOfMinute(time);
+		case 'hour': return dateFns.endOfHour(time);
+		case 'day': return dateFns.endOfDay(time);
+		case 'week': return dateFns.endOfWeek(time);
+		case 'month': return dateFns.endOfMonth(time);
+		case 'quarter': return dateFns.endOfQuarter(time);
+		case 'year': return dateFns.endOfYear(time);
+		default: return time;
+		}
+	}
+});
+
+})));