dateutil.as

Flex的JSON类库

				var day:String = null;
				
				if (dateParts[0].search(/\d/) == -1)
				{
					day = dateParts.shift().replace(/\W/, "");
				}
				
				var date:Number = Number(dateParts.shift());
				var month:Number = Number(DateUtil.getShortMonthIndex(dateParts.shift()));
				var year:Number = Number(dateParts.shift());
				var timeParts:Array = dateParts.shift().split(":");
				var hour:Number = int(timeParts.shift());
				var minute:Number = int(timeParts.shift());
				var second:Number = (timeParts.length > 0) ? int(timeParts.shift()): 0;
	
				var milliseconds:Number = Date.UTC(year, month, date, hour, minute, second, 0);
	
				var timezone:String = dateParts.shift();
				var offset:Number = 0;

				if (timezone.search(/\d/) == -1)
				{
					switch(timezone)
					{
						case "UT":
							offset = 0;
							break;
						case "UTC":
							offset = 0;
							break;
						case "GMT":
							offset = 0;
							break;
						case "EST":
							offset = (-5 * 3600000);
							break;
						case "EDT":
							offset = (-4 * 3600000);
							break;
						case "CST":
							offset = (-6 * 3600000);
							break;
						case "CDT":
							offset = (-5 * 3600000);
							break;
						case "MST":
							offset = (-7 * 3600000);
							break;
						case "MDT":
							offset = (-6 * 3600000);
							break;
						case "PST":
							offset = (-8 * 3600000);
							break;
						case "PDT":
							offset = (-7 * 3600000);
							break;
						case "Z":
							offset = 0;
							break;
						case "A":
							offset = (-1 * 3600000);
							break;
						case "M":
							offset = (-12 * 3600000);
							break;
						case "N":
							offset = (1 * 3600000);
							break;
						case "Y":
							offset = (12 * 3600000);
							break;
						default:
							offset = 0;
					}
				}
				else
				{
					var multiplier:Number = 1;
					var oHours:Number = 0;
					var oMinutes:Number = 0;
					if (timezone.length != 4)
					{
						if (timezone.charAt(0) == "-")
						{
							multiplier = -1;
						}
						timezone = timezone.substr(1, 4);
					}
					oHours = Number(timezone.substr(0, 2));
					oMinutes = Number(timezone.substr(2, 2));
					offset = (((oHours * 3600000) + (oMinutes * 60000)) * multiplier);
				}

				finalDate = new Date(milliseconds - offset);

				if (finalDate.toString() == "Invalid Date")
				{
					throw new Error("This date does not conform to RFC822.");
				}
			}
			catch (e:Error)
			{
				var eStr:String = "Unable to parse the string [" +str+ "] into a date. ";
				eStr += "The internal error was: " + e.toString();
				throw new Error(eStr);
			}
            return finalDate;
		}
	     
		/**
		* Returns a date string formatted according to RFC822.
		*
		* @param d
		*
		* @returns
		*
		* @langversion ActionScript 3.0
		* @playerversion Flash 9.0
		* @tiptext
		*
		* @see http://asg.web.cmu.edu/rfc/rfc822.html
		*/	
		public static function toRFC822(d:Date):String
		{
			var date:Number = d.getUTCDate();
			var hours:Number = d.getUTCHours();
			var minutes:Number = d.getUTCMinutes();
			var seconds:Number = d.getUTCSeconds();
			var sb:String = new String();
			sb += DateBase.dayNamesShort[d.getUTCDay()];
			sb += ", ";
			
			if (date < 10)
			{
				sb += "0";
			}
			sb += date;
			sb += " ";
			//sb += DateUtil.SHORT_MONTH[d.getUTCMonth()];
			sb += DateBase.monthNamesShort[d.getUTCMonth()];
			sb += " ";
			sb += d.getUTCFullYear();
			sb += " ";
			if (hours < 10)
			{			
				sb += "0";
			}
			sb += hours;
			sb += ":";
			if (minutes < 10)
			{			
				sb += "0";
			}
			sb += minutes;
			sb += ":";
			if (seconds < 10)
			{			
				sb += "0";
			}
			sb += seconds;
			sb += " GMT";
			return sb;
		}
	     
		/**
		* Parses dates that conform to the W3C Date-time Format into Date objects.
		*
		* This function is useful for parsing RSS 1.0 and Atom 1.0 dates.
		*
		* @param str
		*
		* @returns
		*
		* @langversion ActionScript 3.0
		* @playerversion Flash 9.0
		* @tiptext
		*
		* @see http://www.w3.org/TR/NOTE-datetime
		*/		     
		public static function parseW3CDTF(str:String):Date
		{
            var finalDate:Date;
			try
			{
				var dateStr:String = str.substring(0, str.indexOf("T"));
				var timeStr:String = str.substring(str.indexOf("T")+1, str.length);
				var dateArr:Array = dateStr.split("-");
				var year:Number = Number(dateArr.shift());
				var month:Number = Number(dateArr.shift());
				var date:Number = Number(dateArr.shift());
				
				var multiplier:Number;
				var offsetHours:Number;
				var offsetMinutes:Number;
				var offsetStr:String;
				
				if (timeStr.indexOf("Z") != -1)
				{
					multiplier = 1;
					offsetHours = 0;
					offsetMinutes = 0;
					timeStr = timeStr.replace("Z", "");
				}
				else if (timeStr.indexOf("+") != -1)
				{
					multiplier = 1;
					offsetStr = timeStr.substring(timeStr.indexOf("+")+1, timeStr.length);
					offsetHours = Number(offsetStr.substring(0, offsetStr.indexOf(":")));
					offsetMinutes = Number(offsetStr.substring(offsetStr.indexOf(":")+1, offsetStr.length));
					timeStr = timeStr.substring(0, timeStr.indexOf("+"));
				}
				else // offset is -
				{
					multiplier = -1;
					offsetStr = timeStr.substring(timeStr.indexOf("-")+1, timeStr.length);
					offsetHours = Number(offsetStr.substring(0, offsetStr.indexOf(":")));
					offsetMinutes = Number(offsetStr.substring(offsetStr.indexOf(":")+1, offsetStr.length));
					timeStr = timeStr.substring(0, timeStr.indexOf("-"));
				}
				var timeArr:Array = timeStr.split(":");
				var hour:Number = Number(timeArr.shift());
				var minutes:Number = Number(timeArr.shift());
				var secondsArr:Array = (timeArr.length > 0) ? String(timeArr.shift()).split(".") : null;
				var seconds:Number = (secondsArr != null && secondsArr.length > 0) ? Number(secondsArr.shift()) : 0;
				var milliseconds:Number = (secondsArr != null && secondsArr.length > 0) ? Number(secondsArr.shift()) : 0;
				var utc:Number = Date.UTC(year, month-1, date, hour, minutes, seconds, milliseconds);
				var offset:Number = (((offsetHours * 3600000) + (offsetMinutes * 60000)) * multiplier);
				finalDate = new Date(utc - offset);
	
				if (finalDate.toString() == "Invalid Date")
				{
					throw new Error("This date does not conform to W3CDTF.");
				}
			}
			catch (e:Error)
			{
				var eStr:String = "Unable to parse the string [" +str+ "] into a date. ";
				eStr += "The internal error was: " + e.toString();
				throw new Error(eStr);
			}
            return finalDate;
		}
	     
		/**
		* Returns a date string formatted according to W3CDTF.
		*
		* @param d
		* @param includeMilliseconds Determines whether to include the
		* milliseconds value (if any) in the formatted string.
		*
		* @returns
		*
		* @langversion ActionScript 3.0
		* @playerversion Flash 9.0
		* @tiptext
		*
		* @see http://www.w3.org/TR/NOTE-datetime
		*/		     
		public static function toW3CDTF(d:Date,includeMilliseconds:Boolean=false):String
		{
			var date:Number = d.getUTCDate();
			var month:Number = d.getUTCMonth();
			var hours:Number = d.getUTCHours();
			var minutes:Number = d.getUTCMinutes();
			var seconds:Number = d.getUTCSeconds();
			var milliseconds:Number = d.getUTCMilliseconds();
			var sb:String = new String();
			
			sb += d.getUTCFullYear();
			sb += "-";
			
			//thanks to "dom" who sent in a fix for the line below
			if (month + 1 < 10)
			{
				sb += "0";
			}
			sb += month + 1;
			sb += "-";
			if (date < 10)
			{
				sb += "0";
			}
			sb += date;
			sb += "T";
			if (hours < 10)
			{
				sb += "0";
			}
			sb += hours;
			sb += ":";
			if (minutes < 10)
			{
				sb += "0";
			}
			sb += minutes;
			sb += ":";
			if (seconds < 10)
			{
				sb += "0";
			}
			sb += seconds;
			if (includeMilliseconds && milliseconds > 0)
			{
				sb += ".";
				sb += milliseconds;
			}
			sb += "-00:00";
			return sb;
		}
		
		/**
		 * Converts a date into just after midnight.
		 */
		public static function makeMorning(d:Date):Date
		{
			var d:Date = new Date(d.time);
			d.hours = 0;
            d.minutes = 0;
            d.seconds = 0;
            d.milliseconds = 0;
            return d;
		}
		
		/**
		 * Converts a date into just befor midnight.
		 */
		public static function makeNight(d:Date):Date
		{
			var d:Date = new Date(d.time);
			d.hours = 23;
            d.minutes = 59;
            d.seconds = 59;
            d.milliseconds = 999;				
            return d;
		}

		/**
		 * Sort of converts a date into UTC.
		 */
		public static function getUTCDate(d:Date):Date
		{
			var nd:Date = new Date();
			var offset:Number = d.getTimezoneOffset() * 60 * 1000; 
			nd.setTime(d.getTime() + offset);
			return nd;
		}
	}
}