格式化一个时间字符串

格式化一个时间字符串

Article last modified on 2002-4-30

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The information in this article applies to:

- Microsoft Visual C++ 6.0

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利用Run-Time Library

具体的用法范例[/b]：[/b] string strTime; CurrentTimeStr(&strTime, TRUE); CurrentTimeStr定义为： [/b][/b]#include <Time.h> ////////////////////////////////////////////////////////////////////// // // STL的常用头文件和声明: // ////////////////////////////////////////////////////////////////////// #pragma warning(disable:4786) #include <string> using namespace std; // ////////////////////////////////////////////////////////////////////// // // 构造出当前时间的字符串 // void CurrentTimeStr(string *pstrTimeString, BOOL bWantMore) { char szTimeString[128]; memset(szTimeString, 0, 128); 使用的结构[/i]tm[/i]的说明[/i]:[/i] 在[/i]WCHAR.H[/i]中定义[/i]:[/i] #ifndef _TM_DEFINED[/i] struct tm {[/i] int tm_sec; /* seconds after the minute - [0,59] */[/i] int tm_min; /* minutes after the hour - [0,59] */[/i] int tm_hour; /* hours since [/i]midnight[/i] - [0,23] */[/i] int tm_mday; /* day of the month - [1,31] */[/i] int tm_mon; /* months since January - [0,11] */[/i] int tm_year; /* years since 1900 */[/i] int tm_wday; /* days since Sunday - [0,6] */[/i] int tm_yday; /* days since January 1 - [0,365] */[/i] int tm_isdst; /* daylight savings time flag */[/i] };[/i] #define _TM_DEFINED[/i] #endif[/i] struct tm *today; time_t[/i]类型是在[/i]WCHAR.H[/i]中定义[/i]:[/i] #ifndef _TIME_T_DEFINED[/i] typedef long time_t;[/i] #define _TIME_T_DEFINED[/i] #endif[/i][/i] time_t ltime; 定义在[/i]Time.H[/i]中[/i][/i] Set time zone from TZ environment variable. If TZ is not set,[/i] the operating system is queried to obtain the default value [/i] for the variable. [/i][/i] _tzset(); 定义在[/i]Time.H[/i]中[/i][/i] Get UNIX-style time and display as number and string.[/i] [/i] time( <ime ); 这个函数的定义是：[/i][/i] struct tm * __cdecl localtime(const time_t *);[/i] 它主要是用来[/i]Use time structure to build a customized time string[/i] and correct for the local time zone[/i]. [/i] 它将返回一个指针，指向[/i]tm[/i]的结构，如果这个时间值是早于[/i]1970[/i]年[/i]1[/i]月[/i]1[/i]日午夜的，则会返回[/i]NULL[/i]。[/i][/i] today = localtime( <ime ); strftime[/i]指定的第一个参数就是目标字符串，第二个参数就是该目标字符串的最大[/i][/i] 长度；[/i][/i] 第三个参数将制定格式化的定义；[/i][/i] 第四个参数是时间结构[/i]tm[/i] 下面说明格式化命令的含义：[/i][/i] %m[/i] [/i] Month as decimal number (01 – 12) [/i] %d[/i] [/i] Day of month as decimal number (01 – 31)[/i] %H[/i] [/i] Hour in 24-hour format (00 – 23) [/i] %M[/i] [/i] Minute as decimal number (00 – 59) [/i] %S[/i] [/i] Second as decimal number (00 – 59) [/i] strftime( szTimeString, 128, "=时间: %m月%d日%H时%M分%S秒 ", today ); (*pstrTimeString).append(szTimeString); } //

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