Using Dates to Get More Dates in Objective-C

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Using Dates to Get More Dates
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As you ve just seen, when you test the difference between two dates, you get an integer representing the number of seconds separating the two dates. Similarly, you can add to or subtract any number of seconds from a date and get another date as a result. This can be useful for several purposes. For instance, you can have a script look in a folder and delete every file that s more than three weeks old. Here is the statement that will test whether to trash the file: if file_modification_date comes before ((current date) 3 * weeks) then --code to delete file... end if
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CHAPTER 5 PICKING UP DATES
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The expression 3 * weeks evaluates as an integer that stands for the number of seconds in three weeks, which you deduct from the current date to obtain the date three weeks ago and compare this against the file s modification date to see whether the file is more than three weeks old. In a script I recently created, I had to figure out the date of the last day of any given month in the current year. Here s how I used date calculations to achieve that: the variable the_month is an integer from 1 to 12, and it stands for the month whose last day I want. (Note that this script specifies months as numbers, not constants, so will work with OS X 10.4 or newer only.) set set set set set the_month to 4 temp_date to current date month of temp_date to the_month + 1 day of temp_date to 1 last_date_for_month to temp_date 1 * days
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On line 2 you create a new date value for the current year. The actual month and day aren t important because you ll change them. Lines 3 and 4 take advantage of one of the more unusual features of date values: not only can you get the current values of their year, month, day, and so on, properties, you can change them too. For example: set the_date to date "Thursday, July 10, 2003 12:00:00 AM" set year of the_date to 2008 the_date --> date "Thursday, July 10, 2008 12:00:00 AM" This allows you to perform some clever tricks with date values. First you take the number of the month you want, add 1 to get the month that follows it, and set the date s month property to the result. Don t worry if the current month is 12; AppleScript is smart enough to realize the month 13 really means January of the following year. Next, in line 4 you set the date s day property to 1, which gives you the date of the first day of the following month. You want the day before that, though, so in the final line you deduct the number of seconds in one day. If you want the date to show a specific time, such as midnight, you can specify that too, either by modifying the value of the date s time property: set time of temp_date to 0 or by using relative to: date "0:00" relative to last_date_for_month
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Let s use the same motif as you did earlier with the file s creation date. This time, however, you will look at a file s modification date. You will create a script that looks at a folder s contents and deletes every file that s older than a specified number of weeks. You need to prompt the user to enter the number of weeks and then calculate what the date was that number of weeks ago. You ll call that date expiration_date. Then, you take the modification date of each file. If it is less than the expiration date, it means the file is more than that number of weeks old and you can delete it. For testing purposes, instead of deleting the file, you can just set its label to red (which requires you to use OS X 10.3 or higher).
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