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<blockquote data-quote="Martin Dickopp" data-source="post: 1692180">Here is some code which does this. DATE_AS_INT expands to a constantexpression, so an optimizing compiler should be able to compute itsvalue at compile time.#include &lt;stdio.h&gt;#define YEAR ((((__DATE__ [7] - '0') * 10 + (__DATE__ [8] - '0')) * 10 \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; + (__DATE__ [9] - '0')) * 10 + (__DATE__ [10] - '0'))#define MONTH (__DATE__ [2] == 'n' ? 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'b' ? 1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'r' ? (__DATE__ [0] == 'M' ? 2 : 3)&nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'y' ? 4&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'n' ? 5&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'l' ? 6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'g' ? 7&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'p' ? 8&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 't' ? 9&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; : __DATE__ [2] == 'v' ? 10 : 11)#define DAY ((__DATE__ [4] == ' ' ? 0 : __DATE__ [4] - '0') * 10&nbsp; &nbsp; &nbsp;&nbsp; \&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; + (__DATE__ [5] - '0'))#define DATE_AS_INT (((YEAR - 2000) * 12 + MONTH) * 31 + DAY)int main (void){&nbsp; &nbsp; printf (&quot;%d-%02d-%02d = %d\n&quot;, YEAR, MONTH + 1, DAY, DATE_AS_INT);&nbsp; &nbsp; return 0;}Martin</blockquote>

[QUOTE="Martin Dickopp, post: 1692180"] Here is some code which does this. DATE_AS_INT expands to a constant expression, so an optimizing compiler should be able to compute its value at compile time. #include <stdio.h> #define YEAR ((((__DATE__ [7] - '0') * 10 + (__DATE__ [8] - '0')) * 10 \ + (__DATE__ [9] - '0')) * 10 + (__DATE__ [10] - '0')) #define MONTH (__DATE__ [2] == 'n' ? 0 \ : __DATE__ [2] == 'b' ? 1 \ : __DATE__ [2] == 'r' ? (__DATE__ [0] == 'M' ? 2 : 3) \ : __DATE__ [2] == 'y' ? 4 \ : __DATE__ [2] == 'n' ? 5 \ : __DATE__ [2] == 'l' ? 6 \ : __DATE__ [2] == 'g' ? 7 \ : __DATE__ [2] == 'p' ? 8 \ : __DATE__ [2] == 't' ? 9 \ : __DATE__ [2] == 'v' ? 10 : 11) #define DAY ((__DATE__ [4] == ' ' ? 0 : __DATE__ [4] - '0') * 10 \ + (__DATE__ [5] - '0')) #define DATE_AS_INT (((YEAR - 2000) * 12 + MONTH) * 31 + DAY) int main (void) { printf ("%d-%02d-%02d = %d\n", YEAR, MONTH + 1, DAY, DATE_AS_INT); return 0; } Martin [/QUOTE]

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