qr code c# open source The Date and Time Format Speci ers in Visual C#.NET

Creating QR Code in Visual C#.NET The Date and Time Format Speci ers

The Date and Time Format Speci ers
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TABLE 22-7
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22:
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Strings and Formatting
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Here is a program that demonstrates the date and time format specifiers:
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// Format time and date information using System; class TimeAndDateFormatDemo { static void Main() { DateTime dt = DateTimeNow; // obtain current time ConsoleWriteLine("d format: {0:d}", dt); ConsoleWriteLine("D format: {0:D}", dt);
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PART II
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ConsoleWriteLine("t format: {0:t}", dt); ConsoleWriteLine("T format: {0:T}", dt); ConsoleWriteLine("f format: {0:f}", dt); ConsoleWriteLine("F format: {0:F}", dt); ConsoleWriteLine("g format: {0:g}", dt); ConsoleWriteLine("G format: {0:G}", dt); ConsoleWriteLine("m format: {0:m}", dt); ConsoleWriteLine("M format: {0:M}", dt); ConsoleWriteLine("o format: {0:o}", dt); ConsoleWriteLine("O format: {0:O}", dt); ConsoleWriteLine("r format: {0:r}", dt); ConsoleWriteLine("R format: {0:R}", dt); ConsoleWriteLine("s format: {0:s}", dt); ConsoleWriteLine("u format: {0:u}", dt); ConsoleWriteLine("U format: {0:U}", dt); ConsoleWriteLine("y format: {0:y}", dt); ConsoleWriteLine("Y format: {0:Y}", dt); } }
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Sample output is shown here:
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d D t T f F g G m M o O r format: format: format: format: format: format: format: format: format: format: format: format: format: 2/11/2010 Thursday, February 11, 2010 11:21 AM 11:21:23 AM Thursday, February 11, 2010 11:21 AM Thursday, February 11, 2010 11:21:23 AM 2/11/2010 11:21 AM 2/11/2010 11:21:23 AM February 11 February 11 2010-02-11T11:21:233768153-06:00 2010-02-11T11:21:233768153-06:00 Thu, 11 Feb 2010 11:21:23 GMT
Part II:
Exploring the C# Library
R s u U y Y
format: format: format: format: format: format:
Thu, 11 Feb 2010 11:21:23 GMT 2010-02-11T11:21:23 2010-02-11 11:21:23Z Thursday, February 11, 2010 5:21:23 PM February, 2010 February, 2010
The next program creates a very simple clock The time is updated once every second At the top of each hour, the computer s bell is sounded It uses the ToString( ) method of DateTime to obtain the formatted time prior to outputting it If the top of the hour has been reached, then the alert character (\a) is appended to the formatted time, thus ringing the bell
// A simple clock using System; class SimpleClock { static void Main() { string t; int seconds; DateTime dt = DateTimeNow; seconds = dtSecond; for(;;) { dt = DateTimeNow; // update time if seconds change if(seconds != dtSecond) { seconds = dtSecond; t = dtToString("T"); if(dtMinute==0 && dtSecond==0) t = t + "\a"; // ring bell at top of hour ConsoleWriteLine(t); } } } }
Creating a Custom Date and Time Format
Although the standard date and time format specifiers will apply to the vast majority of situations, you can create your own, custom formats The process is similar to creating custom formats for the numeric types, as described earlier In essence, you simply create an example (picture) of what you want the date and time information to look like To create a custom date and time format, you will use one or more of the placeholders shown in Table 22-8 If you examine Table 22-8, you will see that the placeholders d, f, g, m, M, s, and t are the same as the date and time format specifiers shown in Table 22-7 In general, if one of these characters is used by itself, it is interpreted as a format specifier Otherwise, it is assumed to be a placeholder If you want to use one of these characters by itself, but have it interpreted as a placeholder, then precede the character with a %
22:
Strings and Formatting
Placeholder d dd ddd dddd f, ff, fff, ffff, fffff, ffffff, fffffff g h hh H HH K m mm M MM MMM MMMM s ss t tt y yy yyy yyyy yyyyy z zz zzz : / %fmt
TABLE 22-8
Replaced By Day of month as a number between 1 and 31 Day of month as a number between 1 and 31 A leading zero prefixes the values 1 through 9 Abbreviated weekday name Full weekday name Fractional seconds, with the number of decimal places specified by the number of fs (If uppercase Fs are used, trailing zeros are not displayed) Era Hour as a number between 1 and 12 Hour as a number between 1 and 12 A leading zero prefixes the values 1 through 9 Hour as a number between 0 and 23 Hour as a number between 0 and 23 A leading zero prefixes the values 0 through 9 Time zone offset in hours It uses the value of the DateTimeKind property to automatically adjust for local time and UTC time (This specifier is now recommended over the z-based specifiers) Minutes Minutes A leading zero prefixes the values 0 through 9 Month as a number between 1 and 12 Month as a number between 1 and 12 A leading zero prefixes the values 1 through 9 Abbreviated month name Full month name Seconds Seconds A leading zero prefixes the values 0 through 9 A or P indicating AM or PM ,
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