Part II: Core ActionScript 3.0 Data Types in Java

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Part II: Core ActionScript 3.0 Data Types
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that day was the birthday of Unix (or so they say). In fact, this kind of time measurement is usually referred to as Unix time, but because it is applied so widely now, I feel it s more diplomatic to call it epoch time. Of course, by putting that number in a signed int, they created a problem. Can you guess what it is A 32-bit signed integer can represent only a time up to 231 seconds before or after the epoch. That means dates before December 1901 and dates after January 2038 are out of the range of epoch time when stored in an int. In those simpler times, 2038 must have looked like a long way away. Thankfully, ActionScript 3.0 uses a Number type to represent epoch time. This means that you d have to be out of your mind to come up with a date it can t represent (remember Number.MAX_VALUE ) , and it also gives you the precision to measure epoch time as milliseconds since the epoch.
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Epoch time in ActionScript 3.0 is represented in milliseconds since January 1, 1970, not seconds.
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In the present, epoch time is still a useful tool. Because it s just a number, you can play with it freely, using arithmetic instead of Date methods when it s more convenient. To selectively use epoch time, you have to be able to convert a Date object to an epoch time and back; methods covered in the following section, Accessing and Modifying a Date, show how to do that. In addition to those methods that t in with other means of modifying a Date, you can pass epoch time to the Date constructor to create a new Date instance from an epoch time, as shown in Example 7-3.
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Creating a Date from an Epoch Time
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var d:Date = new Date(0); trace(d); // Wed Dec 31 16:00:00 GMT-0800 1969
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In addition, if you want nothing to do with Date objects and just want to use epoch time, you can parse strings into dates without creating a new Date object by using the Date class s static parse() method:
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trace(Date.parse("1/1/1970")); // 28800000
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Did you notice something wrong with these examples Get a different value when you executed them Shouldn t the rst one return January 1, 1970 and the second one 0 They would, if you lived on the Greenwich meridian.
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As you know, one of the complications of our way of measuring time is the separation of our globe into time zones, where the same instant is a different time at different longitudes. The Date class also takes this into account. When you create a new Date object, ActionScript assumes you want it in your local time zone unless you specify a time zone, as in new Date("Jan 28 19:46:00 GMT-0500 2007"). Once you have a Date object, you can operate on it and reference it in either your local time zone or UTC.
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7: Numbers, Math, and Dates
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UTC, or Coordinated Universal Time, is the same thing as GMT, Greenwich Mean Time, and is the neutral time zone. So if you want two people on different parts of the globe to agree on what to call a certain time, they can both reference it by the same time zone to call it the same time. That time zone is UTC or GMT, the time zone over the Greenwich meridian in Great Britain. So by referencing times with respect to UTC, you can avoid geographical implications. Because epoch time is measured relative to a speci c instant, you need that reference point to be xed. The epoch is not just January 1, 1970 at midnight; it s January 1, 1970, midnight at UTC. Therefore, if I am in Los Angeles using Paci c Time, GMT-0800, the local time of the epoch is at plus eight hours, or 28,800,000 milliseconds like the example showed. In the rst part of the example, you created a new Date object at the actual epoch time, but you printed it in our local time. For Californians, that s December 31, 1969 at 4 p.m. When it s midnight in UTC, it s 4 p.m. the previous day in Paci c time. Your results may vary as you run the example from your local time zone. Even my results completely changed, as I revised this chapter in Brooklyn during Daylight Savings Time (GMT-0400). In the second part of the example, you created a new Date to represent January 1, 1970 in our local time. Epoch time is measured from January 1, 1970 UTC, so again in California the difference is eight hours, or 1,000 ms/sec * 60 sec/min * 60 min/hr * 8 hr = 28,800,000 ms. Try running the example yourself and verifying your own time zone.
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