fix: uninitialized value revealed by clang-21 warning (#4940)

Signed-off-by: Larry Gritz <[email protected]>

Author: lgritz

src/iconvert/iconvert.cpp

@@ -152,7 +152,7 @@ DateTime_to_time_t(string_view datetime, time_t& timet)
         return false;
     // OIIO::print("{}:{}:{} {}:{}:{}\n", year, month, day, hour, min, sec);
     struct tm tmtime;
-    time_t now;
+    time_t now = time(nullptr);
     Sysutil::get_local_time(&now, &tmtime);  // fill in defaults
     tmtime.tm_sec  = sec;
     tmtime.tm_min  = min;

src/oiiotool/oiiotool.cpp

@@ -1046,7 +1046,7 @@ DateTime_to_time_t(string_view datetime, time_t& timet)
         return false;
     // OIIO::print("{}:{}:{} {}:{}:{}\n", year, month, day, hour, min, sec);
     struct tm tmtime;
-    time_t now;
+    time_t now = time(nullptr);
     Sysutil::get_local_time(&now, &tmtime);  // fill in defaults
     tmtime.tm_sec  = sec;
     tmtime.tm_min  = min;