2 files changed, 21 insertions, 29 deletions

diff --git a/src/c/fastforge_core.c b/src/c/fastforge_core.c
index 39d9ea8..c9d3ce1 100644
--- a/src/c/fastforge_core.c
+++ b/src/c/fastforge_core.c
@@ -61,6 +61,24 @@ static int compare_time_t_ascending(const void *a, const void *b) {
   return 0;
 }
 
+time_t fastforge_local_day_start_platform(time_t timestamp) {
+  if (timestamp <= 0) {
+    return 0;
+  }
+
+  struct tm *tm_info = localtime(&timestamp);
+  if (!tm_info) {
+    return 0;
+  }
+
+  struct tm tm_copy = *tm_info;
+  tm_copy.tm_hour = 0;
+  tm_copy.tm_min = 0;
+  tm_copy.tm_sec = 0;
+  tm_copy.tm_isdst = -1;
+  return mktime(&tm_copy);
+}
+
 static bool is_next_local_day(time_t first_day, time_t second_day) {
   if (first_day <= 0 || second_day <= 0 || second_day < first_day) {
     return false;
diff --git a/src/c/fastforge_logic.c b/src/c/fastforge_logic.c
index b8b44da..b765e83 100644
--- a/src/c/fastforge_logic.c
+++ b/src/c/fastforge_logic.c
@@ -3,24 +3,6 @@
 #include <stdio.h>
 #include <time.h>
 
-#ifndef __struct_tm_defined
-#define FASTFORGE_TZ_LEN 6
-struct tm {
-  int tm_sec;
-  int tm_min;
-  int tm_hour;
-  int tm_mday;
-  int tm_mon;
-  int tm_year;
-  int tm_wday;
-  int tm_yday;
-  int tm_isdst;
-  int tm_gmtoff;
-  char tm_zone[FASTFORGE_TZ_LEN];
-};
-#endif
-struct tm *localtime(const time_t *timep);
-time_t mktime(struct tm *tb);
 
 time_t entry_duration_seconds(const FastEntry *entry) {
   if (!entry || entry->start_time == 0 || entry->end_time <= entry->start_time) {
@@ -74,22 +56,14 @@ void format_duration_hours_minutes(time_t seconds, char *buffer, size_t size) {
   snprintf(buffer, size, "%dh %02dm", hours, minutes);
 }
 
+time_t fastforge_local_day_start_platform(time_t timestamp);
+
 time_t local_day_start(time_t timestamp) {
   if (timestamp <= 0) {
     return 0;
   }
 
-  struct tm *tm_info = localtime(&timestamp);
-  if (!tm_info) {
-    return 0;
-  }
-
-  struct tm tm_copy = *tm_info;
-  tm_copy.tm_hour = 0;
-  tm_copy.tm_min = 0;
-  tm_copy.tm_sec = 0;
-  tm_copy.tm_isdst = -1;
-  return mktime(&tm_copy);
+  return fastforge_local_day_start_platform(timestamp);
 }
 
 bool running_fast_is_at_target(const FastEntry *entry, time_t now) {