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 8cf2539..ad6684a 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; +} |