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                ## mktime ## 將時間結構數據轉換成經過的秒數 ### 相關函數 ### time,asctime,gmtime,localtime ### 表頭文件 ### ``` #include<time.h> ``` ### 定義函數 ### ``` time_t mktime(strcut tm *timeptr); ``` ### 函數說明 ### mktime()用來將參數timeptr所指的tm結構數據轉換成從公元1970年1月1日0時0分0 秒算起至今的UTC時間所經過的秒數。 ### 返回值 ### 返回經過的秒數。 ### 范例 ### ``` /* 用time()取得時間(秒數),利用localtime() 轉換成struct tm 再利用mktine()將struct tm轉換成原來的秒數*/ #include<time.h> main() { time_t timep; strcut tm *p; time(&timep); printf(“time() : %d \n”,timep); p=localtime(&timep); timep = mktime(p); printf(“time()->localtime()->mktime():%d\n”,timep); } ``` ### 執行 ### ``` time():974943297 time()->localtime()->mktime():974943297 ```
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