ActionScript 3.0 + Calculate timespan between two dates?
I created an ActionScript TimeSpan class with a similar API to System.TimeSpan to fill that void, but there are differences due to the lack of operator overloading. You can use it like so:
TimeSpan.fromDates(later, earlier).totalDays;
Below is the code for the class (sorry for the big post - I won't include the Unit Tests ;)
/**
* Represents an interval of time
*/
public class TimeSpan
{
private var _totalMilliseconds : Number;
public function TimeSpan(milliseconds : Number)
{
_totalMilliseconds = Math.floor(milliseconds);
}
/**
* Gets the number of whole days
*
* @example In a TimeSpan created from TimeSpan.fromHours(25),
* totalHours will be 1.04, but hours will be 1
* @return A number representing the number of whole days in the TimeSpan
*/
public function get days() : int
{
return int(_totalMilliseconds / MILLISECONDS_IN_DAY);
}
/**
* Gets the number of whole hours (excluding entire days)
*
* @example In a TimeSpan created from TimeSpan.fromMinutes(1500),
* totalHours will be 25, but hours will be 1
* @return A number representing the number of whole hours in the TimeSpan
*/
public function get hours() : int
{
return int(_totalMilliseconds / MILLISECONDS_IN_HOUR) % 24;
}
/**
* Gets the number of whole minutes (excluding entire hours)
*
* @example In a TimeSpan created from TimeSpan.fromMilliseconds(65500),
* totalSeconds will be 65.5, but seconds will be 5
* @return A number representing the number of whole minutes in the TimeSpan
*/
public function get minutes() : int
{
return int(_totalMilliseconds / MILLISECONDS_IN_MINUTE) % 60;
}
/**
* Gets the number of whole seconds (excluding entire minutes)
*
* @example In a TimeSpan created from TimeSpan.fromMilliseconds(65500),
* totalSeconds will be 65.5, but seconds will be 5
* @return A number representing the number of whole seconds in the TimeSpan
*/
public function get seconds() : int
{
return int(_totalMilliseconds / MILLISECONDS_IN_SECOND) % 60;
}
/**
* Gets the number of whole milliseconds (excluding entire seconds)
*
* @example In a TimeSpan created from TimeSpan.fromMilliseconds(2123),
* totalMilliseconds will be 2001, but milliseconds will be 123
* @return A number representing the number of whole milliseconds in the TimeSpan
*/
public function get milliseconds() : int
{
return int(_totalMilliseconds) % 1000;
}
/**
* Gets the total number of days.
*
* @example In a TimeSpan created from TimeSpan.fromHours(25),
* totalHours will be 1.04, but hours will be 1
* @return A number representing the total number of days in the TimeSpan
*/
public function get totalDays() : Number
{
return _totalMilliseconds / MILLISECONDS_IN_DAY;
}
/**
* Gets the total number of hours.
*
* @example In a TimeSpan created from TimeSpan.fromMinutes(1500),
* totalHours will be 25, but hours will be 1
* @return A number representing the total number of hours in the TimeSpan
*/
public function get totalHours() : Number
{
return _totalMilliseconds / MILLISECONDS_IN_HOUR;
}
/**
* Gets the total number of minutes.
*
* @example In a TimeSpan created from TimeSpan.fromMilliseconds(65500),
* totalSeconds will be 65.5, but seconds will be 5
* @return A number representing the total number of minutes in the TimeSpan
*/
public function get totalMinutes() : Number
{
return _totalMilliseconds / MILLISECONDS_IN_MINUTE;
}
/**
* Gets the total number of seconds.
*
* @example In a TimeSpan created from TimeSpan.fromMilliseconds(65500),
* totalSeconds will be 65.5, but seconds will be 5
* @return A number representing the total number of seconds in the TimeSpan
*/
public function get totalSeconds() : Number
{
return _totalMilliseconds / MILLISECONDS_IN_SECOND;
}
/**
* Gets the total number of milliseconds.
*
* @example In a TimeSpan created from TimeSpan.fromMilliseconds(2123),
* totalMilliseconds will be 2001, but milliseconds will be 123
* @return A number representing the total number of milliseconds in the TimeSpan
*/
public function get totalMilliseconds() : Number
{
return _totalMilliseconds;
}
/**
* Adds the timespan represented by this instance to the date provided and returns a new date object.
* @param date The date to add the timespan to
* @return A new Date with the offseted time
*/
public function add(date : Date) : Date
{
var ret : Date = new Date(date.time);
ret.milliseconds += totalMilliseconds;
return ret;
}
/**
* Creates a TimeSpan from the different between two dates
*
* Note that start can be after end, but it will result in negative values.
*
* @param start The start date of the timespan
* @param end The end date of the timespan
* @return A TimeSpan that represents the difference between the dates
*
*/
public static function fromDates(start : Date, end : Date) : TimeSpan
{
return new TimeSpan(end.time - start.time);
}
/**
* Creates a TimeSpan from the specified number of milliseconds
* @param milliseconds The number of milliseconds in the timespan
* @return A TimeSpan that represents the specified value
*/
public static function fromMilliseconds(milliseconds : Number) : TimeSpan
{
return new TimeSpan(milliseconds);
}
/**
* Creates a TimeSpan from the specified number of seconds
* @param seconds The number of seconds in the timespan
* @return A TimeSpan that represents the specified value
*/
public static function fromSeconds(seconds : Number) : TimeSpan
{
return new TimeSpan(seconds * MILLISECONDS_IN_SECOND);
}
/**
* Creates a TimeSpan from the specified number of minutes
* @param minutes The number of minutes in the timespan
* @return A TimeSpan that represents the specified value
*/
public static function fromMinutes(minutes : Number) : TimeSpan
{
return new TimeSpan(minutes * MILLISECONDS_IN_MINUTE);
}
/**
* Creates a TimeSpan from the specified number of hours
* @param hours The number of hours in the timespan
* @return A TimeSpan that represents the specified value
*/
public static function fromHours(hours : Number) : TimeSpan
{
return new TimeSpan(hours * MILLISECONDS_IN_HOUR);
}
/**
* Creates a TimeSpan from the specified number of days
* @param days The number of days in the timespan
* @return A TimeSpan that represents the specified value
*/
public static function fromDays(days : Number) : TimeSpan
{
return new TimeSpan(days * MILLISECONDS_IN_DAY);
}
/**
* The number of milliseconds in one day
*/
public static const MILLISECONDS_IN_DAY : Number = 86400000;
/**
* The number of milliseconds in one hour
*/
public static const MILLISECONDS_IN_HOUR : Number = 3600000;
/**
* The number of milliseconds in one minute
*/
public static const MILLISECONDS_IN_MINUTE : Number = 60000;
/**
* The number of milliseconds in one second
*/
public static const MILLISECONDS_IN_SECOND : Number = 1000;
}
You can covert the two date times into milliseconds since the epoch, perform your math and then use the resultant milliseconds to calculate these higher timespan numbers.
var someDate:Date = new Date(...);
var anotherDate:Date = new Date(...);
var millisecondDifference:int = anotherDate.valueOf() - someDate.valueOf();
var seconds:int = millisecondDifference / 1000;
....
The LiveDocs are useful for this type of thing too. Sorry if the ActionScript is a bit off, but it has been a while.
I'd also recommend creating a set of static class methods that can perform these operations if you're doing a lot of this type of math. Sadly, this basic functionality doesn't really exist in the standard APIs.
for some a single function like this my be preferable... [condensed from Richard Szalay's code]
public function timeDifference(startTime:Date, endTime:Date) : String
{
if (startTime == null) { return "startTime empty."; }
if (endTime == null) { return "endTime empty."; }
var aTms = Math.floor(endTime.valueOf() - startTime.valueOf());
return "Time taken: "
+ String( int(aTms/(24*60*+60*1000)) ) + " days, "
+ String( int(aTms/( 60*60*1000)) %24 ) + " hours, "
+ String( int(aTms/( 60*1000)) %60 ) + " minutes, "
+ String( int(aTms/( 1*1000)) %60 ) + " seconds.";
}