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#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <stdlib.h>
#include "tztable.h"
/*it's not case sensitive
returns the offset
returns -1 if it doesn't find it*/
int findintable(char *what){
for(size_t i = 0; i < TZTABLE_LENGHT; i++){
if((strcasecmp(what, tz_table[i].zn)) == 0){
return tz_table[i].offset;
}
}
return -1;
}
davidtime strtimetoint(char *whattimeisit) {
davidtime timehoursandminutes = {0, 0};
if (whattimeisit == NULL)return timehoursandminutes;
char buf[16];
strncpy(buf, whattimeisit, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\0';
char *token = strtok(buf, ":");
if (token == NULL) return timehoursandminutes;
timehoursandminutes.hour = atoi(token);
token = strtok(NULL, ":");
if (token == NULL) return timehoursandminutes;
timehoursandminutes.minutes = atoi(token);
return timehoursandminutes;
}
int convert(char *timey, char *zone){
time_t rawtime = time(NULL);
struct tm *ptm = gmtime(&rawtime);
ptm->tm_isdst = -1;
time_t gmt = mktime(ptm);
int offset = difftime(rawtime, gmt) / 60;
//this sould take even daylight savings too, i stole it from stack overflow i've been trying to not use llms to code shit like this
//tmzn hour --> utc00 --> local time
int zntime = findintable(zone);
if(zntime == -1)return -1;
davidtime eugh = strtimetoint(timey);
int total = eugh.hour * 60 + eugh.minutes - zntime + offset; //ok this is better yeah
int day = 0;
while (total < 0){
total += 1440; day--;
}
while (total >= 1440){
total -= 1440; day++;
}
printf("%02d:%02d", total / 60, total % 60);
if(day) printf(" %+dd", day);
printf("\n");
return 0;
}
int main (int argc, char **argv){
if((argc <= 2) || (argc > 3)){
printf("%s: usage: %s [TIME (24hs)] [ZONE]\ne.g: %s 7:15 est\n", argv[0], argv[0], argv[0]);
exit(0);
}
if(convert(argv [1], argv[2]) == -1){
printf("%s: time zone not found, did you write it correctly?\n", argv[0]);
return 1;
}else return 0;
}
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