diff options
Diffstat (limited to 'lib/datecalc.c')
| -rw-r--r-- | lib/datecalc.c | 156 |
1 files changed, 78 insertions, 78 deletions
diff --git a/lib/datecalc.c b/lib/datecalc.c index ad6684a..8cf2539 100644 --- a/lib/datecalc.c +++ b/lib/datecalc.c @@ -1,78 +1,78 @@ -/* datedif - calculates the difference in days between two dates - * Copyright (C) 2000 Micael Widell contact: xeniac@linux.nu - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#include <time.h> -#include <stdlib.h> -#include <string.h> - - -/* Gaus's formula - days since 1.3.1600 (Gregorian calendar) */ -int days(register int n, register int m, register int y) -{ - register int cy; - if((m -= 2) <= 0){ - m += 12; y--; - } - y -= 1600; cy = y/100; - return 365*y+y/4-cy+cy/4+367*m/12+n-31; -} - - -double dateCalc(char date1[], char date2[]){ - - /* Declare the needed variables */ - char* date[2] = { date1, date2 }; - struct tm *date_tm[2]; - time_t date_time_t[2]; - double dateDifference; - int isToday[2] = { 0, 0 }; - char buffer[5]; - int day[2], month[2], year[2], i; - - - /* If any of the arguments are "today", then include today's date in the - right variables */ - for(i = 0; i < 2; i++){ - if(!strcmp(date[i], "today")){ - time(&date_time_t[i]); - date_tm[i] = localtime(&date_time_t[i]); - day[i] = (*date_tm[i]).tm_mday; - month[i] = (*date_tm[i]).tm_mon + 1; - year[i] = (*date_tm[i]).tm_year + 1900; - isToday[i] = 1; - } - } - - /* Cut out the year, month and day from 8-digit datestrings */ - for (i = 0; i < 2; i++){ - if(!isToday[i]){ - memset(buffer, 0, 5); - strncpy(buffer, &date[i][6], 2); - day[i] = atoi(buffer); - strncpy(buffer, &date[i][4], 2); - month[i] = atoi(buffer); - strncpy(buffer, date[i], 4); - year[i] = atoi(buffer); - } - } - - /* Calculate the difference */ - dateDifference = days(day[1], month[1], year[1]) - days(day[0], month[0], year[0]); - - return dateDifference; -} +/* datedif - calculates the difference in days between two dates
+ * Copyright (C) 2000 Micael Widell contact: xeniac@linux.nu
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <time.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/* Gaus's formula - days since 1.3.1600 (Gregorian calendar) */
+int days(register int n, register int m, register int y)
+{
+ register int cy;
+ if((m -= 2) <= 0){
+ m += 12; y--;
+ }
+ y -= 1600; cy = y/100;
+ return 365*y+y/4-cy+cy/4+367*m/12+n-31;
+}
+
+
+double dateCalc(char date1[], char date2[]){
+
+ /* Declare the needed variables */
+ char* date[2] = { date1, date2 };
+ struct tm *date_tm[2];
+ time_t date_time_t[2];
+ double dateDifference;
+ int isToday[2] = { 0, 0 };
+ char buffer[5];
+ int day[2], month[2], year[2], i;
+
+
+ /* If any of the arguments are "today", then include today's date in the
+ right variables */
+ for(i = 0; i < 2; i++){
+ if(!strcmp(date[i], "today")){
+ time(&date_time_t[i]);
+ date_tm[i] = localtime(&date_time_t[i]);
+ day[i] = (*date_tm[i]).tm_mday;
+ month[i] = (*date_tm[i]).tm_mon + 1;
+ year[i] = (*date_tm[i]).tm_year + 1900;
+ isToday[i] = 1;
+ }
+ }
+
+ /* Cut out the year, month and day from 8-digit datestrings */
+ for (i = 0; i < 2; i++){
+ if(!isToday[i]){
+ memset(buffer, 0, 5);
+ strncpy(buffer, &date[i][6], 2);
+ day[i] = atoi(buffer);
+ strncpy(buffer, &date[i][4], 2);
+ month[i] = atoi(buffer);
+ strncpy(buffer, date[i], 4);
+ year[i] = atoi(buffer);
+ }
+ }
+
+ /* Calculate the difference */
+ dateDifference = days(day[1], month[1], year[1]) - days(day[0], month[0], year[0]);
+
+ return dateDifference;
+}
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