c语言Date_time库函数学习
点击次数：36 次 发布日期：2008-12-01 11:57:05 作者：源代码网
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#include <time.h> time_t time( time_t *time ); 函数time()返回当前时间 若参数time给定,则当前时间存储在time指针中 在VC中，若需要给定time参数，并且返回值和time储存值相同,或是赋予NULL的值 time_t类型即long类型,其值是系统从1970年1月1日00:00:00到现在总共的秒数 #include <time.h> struct tm *localtime( const time_t *time ); 函数将time的值转换为当地时间，用结构体tm存储 time的值可有上诉函数time()获取 该函数可结合下面的函数使用 #include <time.h> char *asctime( const struct tm *ptr ); 将结构体*ptr的内容转换为如下形式的字符串 day month date hours:minutes:seconds year eg. Mon Sep 24 16:18:20 2007 #include <time.h> size_t strftime( char *str, size_t maxsize, const char *fmt, struct tm *time ); 函数以fmt的特定格式将time格式化后存储在str字符串中 %a abbreviated weekday name (e.g. Fri) %A full weekday name (e.g. Friday) %b abbreviated month name (e.g. Oct) %B full month name (e.g. October) %c the standard date and time string %d day of the month, as a number (1-31) %H hour, 24 hour format (0-23) %I hour, 12 hour format (1-12) %j day of the year, as a number (1-366) [Page] %m month as a number (1-12). Note: some versions of Microsoft Visual C++ may use values that range from 0-11. %M minute as a number (0-59) %p locale’s equivalent of AM or PM %S second as a number (0-59) %U week of the year, (0-53), where week 1 has the first Sunday %w weekday as a decimal (0-6), where Sunday is 0 %W week of the year, (0-53), where week 1 has the first Monday %x standard date string %X standard time string %y year in decimal, without the century (0-99) %Y year in decimal, with the century %Z time zone name %% a percent sign #include <time.h> time_t mktime( struct tm *time ); 函数将结构体参数time转换为从1970年1月1日到现在时间的秒数 它是time的相反函数 #include <time.h> struct tm *gmtime( const time_t *time ); 函数将time转换为结构体tm的形式存储，以Coordinated Universal Time的形式 与localtime函数类似 #include <time.h> double difftime( time_t time2, time_t time1 ); 源代码网供稿. |
