Ctime format in VC ++

Ctime format in VC ++

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Ctime format usage You can use the ctime class to conveniently obtain the current system time and convert it to various formats. TheFormatArgument consists of one or more codes; as inPrintf, The formatting codes are preceded by a percent sign (%). Characters that do not begin%Are copied unchangedStrdest.TheLc_timeCategory of the current locale affects the output formattingStrftime. (For more information onLc_time, See setlocale.) The formatting codesStrftimeAre listed below: % Abbreviated weekday name % Full weekday name % B Abbreviated month name % B Full month name % C Date and Time Representation appropriate for locale % D Day of month as decimal number (01-31) % H Hour in 24-hour format (00-23) % I Hour in 12-hour format (01-12) % J Day of year as decimal number (001-366) % M Month as decimal number (01-12) % M Minute as decimal number (00-59) % P Current locale's a. m./P. M. Indicator for 12-hour clock % S Second as decimal number (00-59) % U Week of year as decimal number, with Sunday as first day of week (00-53) % W Weekday as decimal number (0-6; Sunday is 0) % W Week of year as decimal number, with Monday as first day of week (00-53) % X Date representation for current locale % X Time Representation for current locale % Y Year without Century, as decimal number (00-99) % Y Year with Century, as decimal number % Z, % Z Either the time-zone name or time zone abbreviation, depending on registry settings; no characters if time zone is unknown % Percent sign As inPrintfFunction,#Flag may prefix any formatting code. In that case, the meaning of the format code is changed as follows. Format code Meaning % #,% #,% # B,% # B,% # P,% # X,% # Z,% # Z,% # % #Flag is ignored. % # C Long Date and Time Representation, appropriate for current locale. For example: "Tuesday, March 14,199 5, 12:41:29 ". % # X Long date representation, appropriate to current locale. For example: "Tuesday, March 14,199 5 ". % # D,% # H,% # I,% # J,% # M,% # M,% # S,% # U,% # W,% # W,% # Y,% # Y Remove leading zeros (if any ). Requirements Routine Required Header Compatibility Strftime <Time. h> ANSI, WIN 98, win me, Win NT, Win 2000, Win XP Wcsftime <Time. h> or <wchar. h> ANSI, WIN 98, win me, Win NT, Win 2000, Win XP Example // crt_times.c /* This program demonstrates these time and date functions: * _time64 _ftime64 _ctime64 asctime * _localtime64 _gmtime64 _mktime64 _tzset * _strtime _strdate strftime * * Also the global variable: * _tzname */ #include <time.h> #include <stdio.h> #include <sys/types.h> #include <sys/timeb.h> #include <string.h> int main() { char tmpbuf[128], ampm[] = "AM"; __time64_t ltime; struct __timeb64 tstruct; struct tm *today, *gmt, xmas = { 0, 0, 12, 25, 11, 93 }; /* Set time zone from TZ environment variable. If TZ is not set, * the operating system is queried to obtain the default value * for the variable. */ _tzset(); /* Display operating system-style date and time. */ _strtime( tmpbuf ); printf( "OS time:tttt%sn", tmpbuf ); _strdate( tmpbuf ); printf( "OS date:tttt%sn", tmpbuf ); /* Get UNIX-style time and display as number and string. */ _time64( &ltime ); printf( "Time in seconds since UTC 1/1/70:t%ldn", ltime ); printf( "UNIX time and date:ttt%s", _ctime64( &ltime ) ); /* Display UTC. */ gmt = _gmtime64( &ltime ); printf( "Coordinated universal time:tt%s", asctime( gmt ) ); /* Convert to time structure and adjust for PM if necessary. */ today = _localtime64( &ltime ); if( today->tm_hour >= 12 ) { strcpy( ampm, "PM" ); today->tm_hour -= 12; } if( today->tm_hour == 0 ) /* Adjust if midnight hour. */ today->tm_hour = 12; /* Note how pointer addition is used to skip the first 11 * characters and printf is used to trim off terminating * characters. */ printf( "12-hour time:tttt%.8s %sn", asctime( today ) + 11, ampm ); /* Print additional time information. */ _ftime64( &tstruct ); printf( "Plus milliseconds:ttt%un", tstruct.millitm ); printf( "Zone difference in hours from UTC:t%un", tstruct.timezone/60 ); printf( "Time zone name:tttt%sn", _tzname[0] ); printf( "Daylight savings:ttt%sn", tstruct.dstflag   "YES" : "NO" ); /* Make time for noon on Christmas, 1993. */ if( _mktime64( &xmas ) != (__time64_t)-1 ) printf( "Christmastttt%sn", asctime( &xmas ) ); /* Use time structure to build a customized time string. */ today = _localtime64( &ltime ); /* Use strftime to build a customized time string. */ strftime( tmpbuf, 128, "Today is %A, day %d of %B in the year %Y.n", today ); printf( tmpbuf ); } Sample output OS time: 14:15:49 OS date: 02/07/02 Time in seconds since UTC 1/1/70: 1013120149 UNIX time and date: Thu Feb 07 14:15:49 2002 Coordinated universal time: Thu Feb 07 22:15:49 2002 12-hour time: 02:15:49 PM Plus milliseconds: 455 Zone difference in hours from UTC: 8 Time zone name: Pacific Standard Time Daylight savings: NO Christmas Sat Dec 25 12:00:00 1993 The following is a simple example: Cstring msg1 = "aaaaaaaaaaa "; Killtimer (1 ); Ctime T = ctime: getcurrenttime (); Char sztime [8]; Int nhour = T. gethour (); Int nminute = T. getminute (); Int nsecond = T. getsecond (); Wsprintf (sztime, "% 02i: % 02i: % 02i", nhour, nminute, nsecond); // two tables are generally used in minutes. M_edit1 = sztime; Updatedata (false ); Settimer (1, 1000, null ); Msg1 = T. Format ("% d-% m-% Y"); // you can see the format function. MessageBox (msg1 ); For the parameter meanings in format, see the preceding description.