time函数总结

头文件time.h

函数原型

time_t time(time_t * Time);

用法：

1.time t;

t=time(NULL);

将1970/1/1到现在的秒数返回给t

2、time t;

time(&t);

实现功能同上

http://www.cplusplus.com/reference/ctime/  上讲的很清楚了：

Functions

Time manipulation

clock

Clock program (function )

difftime

Return difference between two times (function )

mktime

Convert tm structure to time_t (function )

time

Get current time (function )

Conversion

asctime

Convert tm structure to string (function )

ctime

Convert time_t value to string (function )

gmtime

Convert time_t to tm as UTC time (function )

localtime

Convert time_t to tm as local time (function )

strftime

Format time as string (function )

Macro constants

CLOCKS_PER_SEC

Clock ticks per second (macro )

NULL

Null pointer (macro )

types

clock_t

Clock type (type )

size_t

Unsigned integral type (type )

time_t

Time type (type )

struct tm

Time structure (type )