[mp4] Remove parsing of creation date

We don't care about it for our use.
Additionally, gmtime and strftime are not thread safe at all and are potential crash points.

media/libstagefright/frameworks/av/media/libstagefright/MPEG4Extractor.cpp

@@ -40,8 +40,6 @@
 #include <utils/String8.h>
 #include "nsTArray.h"
 
-#include <limits>
-
 static const uint32_t kMAX_ALLOCATION =
     (SIZE_MAX < INT32_MAX ? SIZE_MAX : INT32_MAX) - 128;
 
@@ -728,30 +726,6 @@ static bool underMetaDataPath(const Vector<uint32_t> &path) {
         && path[3] == FOURCC('i', 'l', 's', 't');
 }
 
-// Given a time in seconds since Jan 1 1904, produce a human-readable string.
-static bool convertTimeToDate(int64_t time_1904, String8 *s) {
-    int64_t time_1970 = time_1904 - (((66 * 365 + 17) * 24) * 3600);
-    if (time_1970 < 0) {
-        return false;
-    }
-    if (time_1970 >= std::numeric_limits<time_t>::max()) {
-        return false;
-    }
-    time_t time_checked = time_1970;
-
-    struct tm* time_gm = gmtime(&time_checked);
-    if (!time_gm) {
-        return false;
-    }
-    char tmp[32];
-    if (!strftime(tmp, sizeof(tmp), "%Y%m%dT%H%M%S.000Z", time_gm)) {
-        return false;
-    }
-
-    s->setTo(tmp);
-    return true;
-}
-
 static bool ValidInputSize(int32_t size) {
   // Reject compressed samples larger than an uncompressed UHD
   // frame. This is a reasonable cut-off for a lossy codec,
@@ -1822,11 +1796,6 @@ status_t MPEG4Extractor::parseChunk(off64_t *offset, int depth) {
                 mHeaderTimescale = U32_AT(&header[12]);
             }
 
-            String8 s;
-            if (convertTimeToDate(creationTime, &s)) {
-                mFileMetaData->setCString(kKeyDate, s.string());
-            }
-
             *offset += chunk_size;
             break;
         }