Adding a $tu specifier to distinguish UTC time and local time printing, saving the time format

Author: wberube

src/app_config.c

@@ -55,6 +55,8 @@ int save_app_config(void) {
     fprintf(file, "  web_auth_pass: %s\n", app_config.web_auth_pass);
     fprintf(file, "  web_enable_static: %s\n", app_config.web_enable_static ? "true" : "false");
     fprintf(file, "  web_server_thread_stack_size: %d\n", app_config.web_server_thread_stack_size);
+    if (!EMPTY(timefmt) || EQUALS(timefmt, DEF_TIMEFMT))
+        fprintf(file, "  time_format: %s\n", timefmt);
 
     for (char i = 0; i < MAX_OSD; i++) {
         char imgEmpty = EMPTY(osds[i].img);
@@ -124,6 +126,9 @@ enum ConfigError parse_app_config(void) {
         &app_config.web_server_thread_stack_size);
     if (err != CONFIG_OK)
         goto RET_ERR;
+    parse_param_value(&ini, "system", "time_format", timefmt);
+    if (EMPTY(timefmt))
+        strcpy(timefmt, DEF_TIMEFMT);
 
     for (char i = 0; i < MAX_OSD; i++) {
         char param[8];

src/region.c

@@ -2,7 +2,7 @@
 
 osd osds[MAX_OSD];
 pthread_t regionPid = 0;
-char timefmt[32] = DEF_TIMEFMT;
+char timefmt[64];
 unsigned int rxb_l, txb_l, cpu_l[6];
 
 void region_fill_formatted(char* str) {
@@ -109,7 +109,11 @@ void region_fill_formatted(char* str) {
             ipos++;
             char s[64];
             time_t t = time(NULL);
-            struct tm *tm = gmtime(&t);
+            struct tm *tm;
+            if (str[ipos + 1] == 'u') {
+                ipos++;
+                tm = gmtime(&t);
+            } else tm = localtime(&t);
             strftime(s, 64, timefmt, tm);
             strcat(out, s);
             opos += strlen(s);

src/region.h

@@ -68,7 +68,7 @@ typedef struct {
 } osd;
 
 extern osd osds[MAX_OSD];
-extern char timefmt[32];
+extern char timefmt[64];
 
 int start_region_handler();
 void stop_region_handler();