1 files changed, 79 insertions, 0 deletions
diff --git a/timetolocal.c b/timetolocal.c
new file mode 100644
index 0000000..fce07d1
--- /dev/null
+++ b/timetolocal.c
@@ -0,0 +1,79 @@
+#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 
+    if(findintable(zone)== -1){
+        return -1;
+    }
+    int zntime = findintable(zone);
+
+    davidtime eugh = strtimetoint(timey); 
+    int zonetimeminutes = (eugh.hour*60)+eugh.minutes;
+    int normalizedminutes = zonetimeminutes+(zntime*-1); //utc00
+
+    int localminutes = (normalizedminutes+offset) % 1440;  
+
+    davidtime finally; 
+    finally.hour = localminutes/60;
+    finally.minutes = localminutes - finally.hour*60;
+    printf("%02d:%02d\n",finally.hour,finally.minutes);
+    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;
+}