.NET Framework Basic Types in .NET

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.NET Framework Basic Types
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You don t need the Subtract method if you simply have to determine whether a Date value is greater or less than another Date value because the CompareTo method is more appropriate for this job:
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Is current date later than October 30, 2001 Select Case Date.Today.CompareTo(New Date(2001, 10, 30)) Case 1 Later than Oct. 30, 2001 Case 1 Earlier than Oct. 30, 2001 Case 0 Today is Oct. 30, 2001. End Select
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Of course you can also use comparison operators if you don t need three-state logic:
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If Date.Today > New Date(2001, 10, 30) Then ...
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Finally, the Date class exposes two shared methods that can be handy in many applications:
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Test for a leap year. Console.WriteLine(Date.IsLeapYear(2000)) Retrieve the number of days in a given month. Console.WriteLine(Date.DaysInMonth(2000, 2)) => True => 29
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Formatting Dates
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The Date type overrides the ToString method to provide a compact representation of the date and time value it contains. (This is the format implicitly used by Console.Write and similar methods.) You can format a Date value in other ways by using some pecu liar methods that only this type exposes:
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This is January 6, 2002 6:30:20.500 PM U.S. Eastern Time. Dim dt As Date = New Date(2002, 1, 6, 18, 30, 20, 500) Console.WriteLine(dt.ToShortDateString) Console.WriteLine(dt.ToLongDateString) Console.WriteLine(dt.ToShortTimeString) Console.WriteLine(dt.ToLongTimeString) Console.WriteLine(dt.ToFileTime) Console.WriteLine(dt.ToOADate) Console.WriteLine(dt.ToUniversalTime) Console.WriteLine(dt.ToLocalTime) => => => => => => => => 01/06/2002
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Sunday, January 06, 2002
6:30 PM
6:30:20 PM
126548334205000000
37262.7710706019
1/6/2002 11:30:20 PM
1/6/2002 1:30:20 PM
A few of these formats might require additional explanation:
The ToFileTime method returns an unsigned 8-byte value representing the date and time as the number of 100-nanosecond intervals that have elapsed since 1/1/ 1601 12:00 AM. The ToOADate method converts to an OLE Automation compatible value. (This is a Double value similar to the Date values used in Visual Basic 6.)
Part III:
Programming the .NET Framework
The ToUniversalTime method considers the Date value a local time and converts it to Coordinated Universal Time (UTC). The ToLocalTime method considers the Date value a UTC value and converts it to a local time.
Parsing Dates
The operation complementary to date formatting is date parsing. The Date class pro vides a Parse shared method for parsing jobs of any degree of complexity:
Dim dt As Date = Date.Parse( 2002/1/6 12:30:20 )
The flexibility of this method becomes apparent when you pass an IFormatProvider object as a second argument to it for example, the DateTimeFormatInfo object. This object is conceptually similar to the NumberFormatInfo object described earlier in this chapter (see the Formatting Numbers section). This object, however, holds informa tion about separators and formats allowed in date and time values:
Get a writable copy of the current locale s DateTimeFormatInfo object.
Dim dtfi As DateTimeFormatInfo
dtfi = CType(DateTimeFormatInfo.CurrentInfo.Clone, DateTimeFormatInfo)
Change date and time separators.
dtfi.DateSeparator = -"
dtfi.TimeSeparator = ."
Now we re ready to parse a date formatted in a nonstandard way.
Dim dt2 As Date = Date.Parse( 2002-1-6 12.30.20", dtfi)
Many non-U.S. developers will appreciate the ability to parse dates in formats other than month/day/year. In this case, you have to assign a correctly formatted pattern to the DateTimeFormatInfo object s ShortDatePattern, LongDatePattern, ShortTimePat tern, LongTimePattern, or FullDateTimePattern property before doing the parse:
Prepare to parse (dd/mm/yy) dates, in short or long format.
dtfi.ShortDatePattern = d/M/yyyy"
dtfi.LongDatePattern = dddd, dd MMMM, yyyy"
Both dt3 and dt4 are assigned the date January 6, 2002 .
Dim dt3 As Date = Date.Parse( 6-1-2002 12.30.44", dtfi)
Dim dt4 As Date = Date.Parse( Sunday, 6 January, 2002", dtfi)
You can use the DateTimeFormatInfo object to retrieve standard or abbreviated names for weekdays and months, according to the current locale or any locale:
Display the abbreviated names of months. For Each s As String In DateTimeFormatInfo.CurrentInfo.AbbreviatedMonthNames Console.WriteLine(s) Next
Even more interesting, you can set weekday and month names with arbitrary strings if you have a writable DateTimeFormatInfo object, and then you can use the object to parse a date written in any language, including invented ones. (Yes, including Klingon!)
7:
.NET Framework Basic Types
Another way to parse strings in formats other than month/day/year is to use the ParseExact shared method. In this case, you pass the format string as the second argument, and you can pass Nothing to the third argument if you don t need a DateTimeFormatInfo object to further qualify the string being parsed:
dt5 is assigned the date January 6, 2002 .
Dim dt5 As Date = Date.ParseExact( 6-1-2002", d-M-yyyy", Nothing)
Finally, the Date class exposes two shared methods, FromFileTime and FromOADate, for the less common operations of parsing from a date, formatted as a file time, or from an OLE Automation date value.
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