C语言之自定义__DATE__与__TIME__

 /*******************************************************************
  *   > File Name: 05-ymd.c
  *   > Author: fly
  *   > Mail: XXXXXXXX@icode.com
  *   > Create Time: Thu Sep  7 16:43:30 2017
  ******************************************************************/

 #include <stdio.h>

 // Retrieve year info
 #define OS_YEAR     ((((__DATE__ [7] - '0') * 10 + (__DATE__ [8] - '0')) * 10 \
                                     + (__DATE__ [] - '')) *  + (__DATE__ [] - ''))

 // Retrieve month info
 #define OS_MONTH    (__DATE__ [2] == 'n' ? (__DATE__ [1] == 'a' ? 1 : 6) \
                                 : __DATE__ [] == 'b' ?  \
                                 : __DATE__ [] == 'r' ? (__DATE__ [] == 'M' ?  : ) \
                                 : __DATE__ [] == 'y' ?  \
                                 : __DATE__ [] == 'l' ?  \
                                 : __DATE__ [] == 'g' ?  \
                                 : __DATE__ [] == 'p' ?  \
                                 : __DATE__ [] == 't' ?  \
                                 : __DATE__ [] == 'v' ?  : )

 // Retrieve day info
 #define OS_DAY      ((__DATE__ [4] == ' ' ? 0 : __DATE__ [4] - '0') * 10 \
                                 + (__DATE__ [] - ''))

 // Retrieve hour info
 #define OS_HOUR     ((__TIME__ [0] - '0') * 10 + (__TIME__ [1] - '0'))

 // Retrieve minute info
 #define OS_MINUTE   ((__TIME__ [3] - '0') * 10 + (__TIME__ [4] - '0'))

 // Retrieve second info
 #define OS_SECOND   ((__TIME__ [6] - '0') * 10 + (__TIME__ [7] - '0'))

 static char time_str[]; //= "YYYYMMDDHHMMSSres";

 char *get_build_time(void)
 {
 #if (1)
     sprintf(time_str,"%02d%02d%02d", OS_YEAR%, OS_MONTH, OS_DAY);
 #else
     sprintf(time_str, "%04d%02d%02d%02d%02d%02d", OS_YEAR, OS_MONTH, OS_DAY, OS_HOUR, OS_MINUTE, OS_SECOND);
 #endif

     return time_str;
 }

 int main(int argc, char* argv[])
 {
     printf("build time :%s\tbuild date :%s\n", __TIME__, __DATE__);
     printf("%s\n", get_build_time());

     return ;
 }