C语言标准宏__DATE__格式化YY/MM/DD

C语言标准宏__DATE__的格式为 "Mmm dd yyyy"，其中Mmm为英文月份缩写，dd为日，yyyy为年份。要将其格式化为YY/MM/DD，可以使用以下方法：

#include <stdio.h>
#include <string.h>

#define DATE_LEN 11

int main() {
    char date[DATE_LEN];
    char year[3], month[3], day[3];
    
    // 将__DATE__复制到date数组中
    strncpy(date, __DATE__, DATE_LEN);
    
    // 将Mmm替换为数字月份
    if (strncmp(date, "Jan", 3) == 0) {
        strncpy(month, "01", 2);
    } else if (strncmp(date, "Feb", 3) == 0) {
        strncpy(month, "02", 2);
    } else if (strncmp(date, "Mar", 3) == 0) {
        strncpy(month, "03", 2);
    } else if (strncmp(date, "Apr", 3) == 0) {
        strncpy(month, "04", 2);
    } else if (strncmp(date, "May", 3) == 0) {
        strncpy(month, "05", 2);
    } else if (strncmp(date, "Jun", 3) == 0) {
        strncpy(month, "06", 2);
    } else if (strncmp(date, "Jul", 3) == 0) {
        strncpy(month, "07", 2);
    } else if (strncmp(date, "Aug", 3) == 0) {
        strncpy(month, "08", 2);
    } else if (strncmp(date, "Sep", 3) == 0) {
        strncpy(month, "09", 2);
    } else if (strncmp(date, "Oct", 3) == 0) {
        strncpy(month, "10", 2);
    } else if (strncmp(date, "Nov", 3) == 0) {
        strncpy(month, "11", 2);
    } else if (strncmp(date, "Dec", 3) == 0) {
        strncpy(month, "12", 2);
    }
    
    // 将dd和yyyy分别复制到day和year数组中
    strncpy(day, date + 4, 2);
    strncpy(year, date + 7, 2);
    
    // 输出YY/MM/DD格式的日期
    printf("%s/%s/%s\n", year, month, day);
    
    return 0;
}