Date and time the system was obtained at compile time

__date__ and __time__ are the 2 more useful macros built into C that can return the date and time that the program was compiled. is useful for version control. is itself a struct tm* type and can be converted using the strftime () function

printf ("%s--%s", __time__,__date__);

Static time_t Getdatefrommacro (char const *time) {
Char s_month[5];
Int month, day, year;
struct TM T = {0};
static const char month_names[] = "Janfebmaraprmayjunjulaugsepoctnovdec";

SSCANF (Time, "%s%d%d", S_month, &day, &year);

Month = (Strstr (month_names, S_month)-month_names)/3;

T.tm_mon = month;
T.tm_mday = day;
T.tm_year = year-1900;
T.TM_ISDST =-1;

Return Mktime (&t);
}
After converting to time_t, it is already basically the main road. time_t included in the time.h.

#ifndef __time_t

#define __time_t

typedef long time_t;
/* To save seconds from January 1, 1970 0:0 0 seconds to the present moment!
Use the time () function to get */

#endif

#if ((__date__[0] = = ' J ') && (__date__[1] = = ' a ') && (__date__[2] = = ' n '))
#define MONTHNUM 1
#elif ((__date__[0] = = ' F ') && (__date__[1] = = ' E ') && (__date__[2] = = ' B '))
#define MONTHNUM 2
#endif
#if ((__date__[0] = = ' M ') && (__date__[1] = = ' a ') && (__date__[2] = = ' R '))
#define MONTHNUM 3
#elif ((__date__[0] = = ' A ') && (__date__[1] = = ' P ') && (__date__[2] = = ' R '))
#define MONTHNUM 4
#endif
#if ((__date__[0] = = ' M ') && (__date__[1] = = ' a ') && (__date__[2] = = ' Y '))
#define MONTHNUM 5
#elif ((__date__[0] = = ' J ') && (__date__[1] = = ' u ') && (__date__[2] = = ' n '))
#define MONTHNUM 6
#endif
#if ((__date__[0] = = ' J ') && (__date__[1] = = ' u ') && (__date__[2] = = ' l '))
#define MONTHNUM 7
#elif ((__date__[0] = = ' A ') && (__date__[1] = = ' u ') && (__date__[2] = = ' g '))
#define MONTHNUM 8
#endif
#if ((__date__[0] = = ' S ') && (__date__[1] = = ' E ') && (__date__[2] = = ' P '))
#define MONTHNUM 9
#elif ((__date__[0] = = ' O ') && (__date__[1] = = ' C ') && (__date__[2] = = ' t '))
#define Monthnum 0x10
#endif
#if ((__date__[0] = = ' N ') && (__date__[1] = = ' O ') && (__date__[2] = = ' V '))
#define Monthnum 0x11
#elif ((__date__[0] = = ' D ') && (__date__[1] = = ' E ') && (__date__[2] = = ' C '))
#define Monthnum 0x12
#endif

Const unsigned char version_date[] = {
((__date__[9]-' 0 ') *16) + (__date__[10]-' 0 ')),
Monthnum,
((__date__[4]-' 0 ') *16) + (__date__[5]-' 0 ')),
};

Const unsigned char version_time[] = {
((__time__[0]-' 0 ') *16) + (__time__[1]-' 0 ')),
((__time__[3]-' 0 ') *16) + (__time__[4]-' 0 ')),
((__time__[6]-' 0 ') *16) + (__time__[7]-' 0 ')),
};

Date and time the system was obtained at compile time