lunch-poll-legacy

Lunch Poll Legacy -- poll colleagues where to have lunch
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date-utils.c (455B)

      1 /**
      2  * Lunch Poll Legacy
      3  * Copyright 2024, 2025 Matthias Balk
      4  */
      5 
      6 #include <sys/types.h>
      7 #include <time.h>
      8 #include <string.h>
      9 
     10 #include "date-utils.h"
     11 
     12 u_int8_t get_day_of_week(const char* date)
     13 {
     14   struct tm tm;
     15   memset(&tm, 0, sizeof(tm));
     16   if (strptime(date, "%Y-%m-%d", &tm) == NULL) {
     17     return 0;
     18   }
     19 
     20   /* tm_wday: Day of the week  [0, 6]   (Sunday = 0) */
     21   if (tm.tm_wday == 0) {
     22     return DOW_SUN;
     23   }
     24   return 0x1 << (tm.tm_wday - 1);
     25 }