c语言获取本地时间

曾经终败给现在 2022-12-03 12:57 166阅读 0赞

1、源代码

#include <stdio.h>
    #include <time.h>
    #include <string.h>
    
    #define Now_Time_LEN 20
    #define Now_Week_Num_LEN 10
    
    char nowTime[10] = { 0};
    char nowWeek_Num[10] = { 0};
    
    void *getNowTime(char *Now_Time, char *Now_Week_Num)
    { 
        int tmp_day = 0;
        int tmp_year = 0;
        int iZoneOffset = 8;
        int month[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        char acWeek[5] = { 0};
        char acHour[3] = { 0};
        char acMin[3] = { 0};
        char acSec[3] = { 0};
    
        memset(Now_Time, 0, Now_Time_LEN + 1);
        memset(Now_Week_Num, 0, Now_Week_Num_LEN + 1);
    
        time_t now;
        struct tm timenow;
    
        now = time(NULL);
        if (now <= 0 || &timenow == NULL)
        { 
            return NULL;
        }
        (void *)gmtime_r(&now, &timenow);
        timenow.tm_year += 1900;
        timenow.tm_mon += 1;
        if (timenow.tm_mon == 2) // 2 月
        { 
            if ((timenow.tm_year % 400 == 0) || (timenow.tm_year % 4 == 0 && timenow.tm_year % 100 != 0))
            { 
                month[2] += 1;
            }
        }
        //+ timezone
        timenow.tm_hour += iZoneOffset;
        if (timenow.tm_hour >= 24)
        { 
            tmp_day = 1;
            timenow.tm_hour %= 24;
        }
        timenow.tm_mday += tmp_day;
        if (timenow.tm_mday > month[timenow.tm_mon])
        { 
            timenow.tm_mday = 1;
            timenow.tm_mon += 1;
        }
        if (timenow.tm_mon > 12)
        { 
            tmp_year = 1;
            timenow.tm_mon = 1;
        }
        timenow.tm_year += tmp_year;
    
        strftime(acWeek, sizeof(acWeek), "%a", &timenow);
        strftime(acHour, sizeof(acHour), "%H", &timenow);
        strftime(acMin, sizeof(acMin), "%M", &timenow);
        strftime(acSec, sizeof(acSec), "%S", &timenow);
    
        if (!strcmp(acWeek, "Mon"))
        { 
            strncat(Now_Week_Num, "1", 1);
        }
        else if (!strcmp(acWeek, "Tue"))
        { 
            strncat(Now_Week_Num, "2", 1);
        }
        else if (!strcmp(acWeek, "Wed"))
        { 
            strncat(Now_Week_Num, "3", 1);
        }
        else if (!strcmp(acWeek, "Thu"))
        { 
            strncat(Now_Week_Num, "4", 1);
        }
        else if (!strcmp(acWeek, "Fri"))
        { 
            strncat(Now_Week_Num, "5", 1);
        }
        else if (!strcmp(acWeek, "Sat"))
        { 
            strncat(Now_Week_Num, "6", 1);
        }
        else if (!strcmp(acWeek, "Sun"))
        { 
            strncat(Now_Week_Num, "7", 1);
        }
        else
        { 
            printf("Now_Week_Num get erro !\n");
        }
    
        strncat(Now_Time, acHour, 2);
        strncat(Now_Time, ":", 1);
        strncat(Now_Time, acMin, 2);
        strncat(Now_Time, ":", 1);
        //strncat(Now_Time, "00", 2);
        strncat(Now_Time, acSec, 2);
        
        return NULL;
    }
    int main()
    { 
        getNowTime(nowTime, nowWeek_Num);
        printf("nowTime is %s !\nnowWeek_Num is %s !\n", nowTime, nowWeek_Num);
        return 0;
    }

2、运行结果  
![在这里插入图片描述][20200903155446455.png_pic_center]

[20200903155446455.png_pic_center]: /images/20221123/7f354ac8067c4821bdc4426f79f5465a.png