vb.net qr code scanner PICKING UP DATES in Objective-C

Print QR in Objective-C PICKING UP DATES

CHAPTER 5 PICKING UP DATES
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Figure 5-2. The Formats tab in the International panel of the Mac OS X System Preferences
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Figure 5-3. Getting the weekday from a date may work, unless the user has changed the date formats in the International panel of System Preferences. In the example shown in Figure 5-3, line 2 will result in the following value: date "Wednesday, December 31, 2003 12:00:00 AM"
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When converted to a string, the first word is Wednesday. The same code could break, however, if the preferences are changed later or the script is run on a different Mac. This issue, however, becomes moot when you become familiar with the properties of the date object, which provide a much better way to do things. I ll discuss those properties in a bit.
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AppleScript does have a few default behavior patterns it uses to convert your date strings into a date object. These are important when your script needs to take different values and make up date objects from them. For instance, your script may need to create a date object containing the first day of the month or let the user input a date and make sure AppleScript understands it. The following date specifiers will all compile properly into date objects (on a U.S. Mac; some users may need to tweak them to make them work on their Macs): date date date date date date "03/03/03" --> date "Monday, March 3, 2003 12:00:00 AM" "0" --> date "Monday, May 31, 2004 12:00:00 AM" "5/1/2002" --> date "Wednesday, May 1, 2002 12:00:00 AM" "Feb 28 5:50 AM" --> date "Monday, February 28, 2005 12:00:00 AM" "3:30" --> date "Monday, May 31, 2004 3:30:00 AM" "May" --> date "Saturday, May 1, 2004 12:00:00 AM"
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I originally ran these examples on May 31, 2004. Some will return slightly different results if you run them yourself on a different day. The following are some of the rules AppleScript will use to compile (or parse during runtime) these strings into dates. In general, AppleScript will do its best to fill in the blanks. Since the date object describes a date and a time down to the second, AppleScript has to add something to any partial/incomplete date strings you give it. If you specify only a date without the time, the default time will be midnight on the date you specified. If you didn t specify AM or PM, AppleScript will treat your time as if you wrote the time in 24-hour format. That means time strings from 0.00.00 to 11.59.59 are treated as AM, whereas 12.00.00 and greater will translate as PM. If you specify only a time without the date, AppleScript will use the date on which the date specifier was evaluated, which could be when the script is compiled (as in these examples) or, if the string is supplied by a variable or other expression, during runtime. The following are some literal date specifiers, before and after AppleScript compiles them. date "03/03/03" compiles as this: date "Monday, March 3, 2003 12:00:00 AM" AppleScript had to tack on the time, which is, by default, midnight. date "0" compiles as this: date "Wednesday, July 2, 2003 12:00:00 AM" AppleScript uses the date the script was compiled. This book is my only alibi for any crime that happened on that date . . . . date "5/1/2002" compiles as this: date "Wednesday, May 1, 2002 12:00:00 AM"
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CHAPTER 5 PICKING UP DATES
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date "Feb 28 5:50 AM" compiles as this: date "Monday, February 28, 2005 12:00:00 AM" Oops! What happened here is that the year hasn t been specified, so AppleScript took the first digit you intended to use for the time and used it for the year. The minutes you specified appear to have been ignored since AppleScript was looking for an hours number by then, and 50 didn t make sense. date "3:30" compiles as this: date "Wednesday, July 2, 2003 3:30:00 AM" Here, the time was understood as 3:30 AM, and the date, again, is the date on which the script was compiled. date "May" compiles as this: date "Thursday, May 1, 2003 12:00:00 AM" In this case, AppleScript used the first day of May on the current year. Date "1" compiles as the following, which is the first day of the current month: date "Tuesday, November 1, 2005 12:00:00 AM" You can also experiment with other numbers. As long as a day in the current month corresponds to that number, every number you use will give you a date that corresponds to that day of the current month. Let s look at one more example date "15" compiles as this: date "Tuesday, November 15, 2005 12:00:00 AM"
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The day number has to be in string form, meaning it must be in double quotes, to be recognized. Also, specifying a nonexistent day will result in an error. For instance, date "32" will not compile on U.S. systems. Other examples of date misunderstandings are as follows: date "31 September" is invalid because there s only 30 days in that month; only years in the range 0 9999 are accepted; date "avril 1, 2006" will compile on a French system but break on a U.S. one; and date "April 1, 2006" will compile on a U.S. system but break on a French one.
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