The display, calculation and Application of the time of Library function call

Time type

UTC Universal time

Calendar time

From January 1, 1970

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Struct tm * gmtime (const time_t*timep)

Function: convert calendar time to Greenwich time

Struct tm {

Int tm_sec

Int tm_min

Int tm_hour

Int tm_mday

Int tm_mon

Int tm_year; / / tm_year + 1900 = which year

Int tm_wday

Int tm_yday

Int tm_isdst

}

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Int main (void) {

Struct tm * local

Time_t t

T=time (NULL)

Local=localtime & t

Printf ("local hour time:%d\ n", loccal- > tm_hour)

Local=gmtime & t

Printf ("utc hour is:% DPo", local- > tm_hour); return 0

}

Get time

Int gettimeofday (struct timeval * tv,struct timezone tz*)

Function; get the jet lag from this morning to the present

Struct timeval {

Int tv_sec; / / miao

Int tv_usec;//wei miao

}

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/ * time function, delay function * /

Void function ()

{

Unsigned int i,j

Double y

For (iSuppli)