diff --git a/src/library_syscall.js b/src/library_syscall.js
index ed7f97d230fdf..90a3151429dd3 100644
--- a/src/library_syscall.js
+++ b/src/library_syscall.js
@@ -64,12 +64,12 @@ var SyscallsLibrary = {
       {{{ makeSetValue('buf', C_STRUCTS.stat.st_size, 'stat.size', 'i64') }}};
       {{{ makeSetValue('buf', C_STRUCTS.stat.st_blksize, '4096', 'i32') }}};
       {{{ makeSetValue('buf', C_STRUCTS.stat.st_blocks, 'stat.blocks', 'i32') }}};
-      {{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_sec, '(stat.atime.getTime() / 1000)|0', 'i32') }}};
+      {{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_sec, 'Math.floor(stat.atime.getTime() / 1000)', 'i64') }}};
       {{{ makeSetValue('buf', C_STRUCTS.stat.st_atim.tv_nsec, '0', 'i32') }}};
-      {{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_sec, '(stat.mtime.getTime() / 1000)|0', 'i32') }}};
+      {{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_sec, 'Math.floor(stat.mtime.getTime() / 1000)', 'i64') }}};
       {{{ makeSetValue('buf', C_STRUCTS.stat.st_mtim.tv_nsec, '0', 'i32') }}};
-      {{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_sec, '(stat.ctime.getTime() / 1000)|0', 'i32') }}};
-      {{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_nsec, '0', 'i32') }}};
+      {{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_sec, 'Math.floor(stat.ctime.getTime() / 1000)', 'i64') }}};
+      {{{ makeSetValue('buf', C_STRUCTS.stat.st_ctim.tv_nsec, '0', 'i64') }}};
       {{{ makeSetValue('buf', C_STRUCTS.stat.st_ino, 'stat.ino', 'i64') }}};
       return 0;
     },
@@ -955,6 +955,7 @@ var SyscallsLibrary = {
     return 0;
   },
   __syscall_utimensat__sig: 'iippi',
+  __syscall_utimensat__deps: ['$readI53FromI64'],
   __syscall_utimensat: function(dirfd, path, times, flags) {
     path = SYSCALLS.getStr(path);
 #if ASSERTIONS
@@ -965,11 +966,11 @@ var SyscallsLibrary = {
       var atime = Date.now();
       var mtime = atime;
     } else {
-      var seconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_sec, 'i32') }}};
+      var seconds = readI53FromI64(times + {{{ C_STRUCTS.timespec.tv_sec }}});
       var nanoseconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_nsec, 'i32') }}};
       atime = (seconds*1000) + (nanoseconds/(1000*1000));
       times += {{{ C_STRUCTS.timespec.__size__ }}};
-      seconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_sec, 'i32') }}};
+      seconds = readI53FromI64(times + {{{ C_STRUCTS.timespec.tv_sec }}});
       nanoseconds = {{{ makeGetValue('times', C_STRUCTS.timespec.tv_nsec, 'i32') }}};
       mtime = (seconds*1000) + (nanoseconds/(1000*1000));
     }
diff --git a/tests/stat/test_stat.c b/tests/stat/test_stat.c
index 7d05b929d73a4..49c2daa9d998c 100644
--- a/tests/stat/test_stat.c
+++ b/tests/stat/test_stat.c
@@ -30,8 +30,9 @@ void create_file(const char *path, const char *buffer, int mode) {
   close(fd);
 }
 
+#define TEST_TIME (1ll << 34)
 void setup() {
-  struct utimbuf t = {1200000000, 1200000000};
+  struct utimbuf t = {TEST_TIME, TEST_TIME};
 
   mkdir("folder", 0777);
   create_file("folder/file", "abcdef", 0777);
@@ -51,7 +52,7 @@ void cleanup() {
 void test() {
   int err;
   struct stat s;
-  struct utimbuf t = {1200000000, 1200000000};
+  struct utimbuf t = {TEST_TIME, TEST_TIME};
 
   // non-existent
   err = stat("does_not_exist", &s);
@@ -70,8 +71,11 @@ void test() {
   assert(s.st_rdev == 0);
 #endif
   assert(s.st_size);
-  assert(s.st_atime == 1200000000);
-  assert(s.st_mtime == 1200000000);
+  printf("TEST_TIME: %llx\n", TEST_TIME);
+  printf("s.st_atime: %llx\n", s.st_atime);
+  printf("s.st_mtime: %llx\n", s.st_mtime);
+  assert(s.st_atime == TEST_TIME);
+  assert(s.st_mtime == TEST_TIME);
   assert(s.st_ctime);
 #ifdef __EMSCRIPTEN__
   assert(s.st_blksize == 4096);
@@ -92,8 +96,8 @@ void test() {
   assert(s.st_nlink);
   assert(s.st_rdev == 0);
   assert(s.st_size == 6);
-  assert(s.st_atime == 1200000000);
-  assert(s.st_mtime == 1200000000);
+  assert(s.st_atime == TEST_TIME);
+  assert(s.st_mtime == TEST_TIME);
   assert(s.st_ctime);
 #ifdef __EMSCRIPTEN__
   assert(s.st_blksize == 4096);
@@ -110,8 +114,8 @@ void test() {
   assert(s.st_nlink);
   assert(s.st_rdev == 0);
   assert(s.st_size == 6);
-  assert(s.st_atime == 1200000000);
-  assert(s.st_mtime == 1200000000);
+  assert(s.st_atime == TEST_TIME);
+  assert(s.st_mtime == TEST_TIME);
   assert(s.st_ctime);
 #ifdef __EMSCRIPTEN__
   assert(s.st_blksize == 4096);
@@ -152,8 +156,8 @@ void test() {
   assert(s.st_nlink);
   assert(s.st_rdev == 0);
   assert(s.st_size == 6);
-  assert(s.st_atime == 1200000000);
-  assert(s.st_mtime == 1200000000);
+  assert(s.st_atime == TEST_TIME);
+  assert(s.st_mtime == TEST_TIME);
   assert(s.st_ctime);
 #ifdef __EMSCRIPTEN__
   assert(s.st_blksize == 4096);
@@ -170,8 +174,8 @@ void test() {
   assert(s.st_nlink);
   assert(s.st_rdev == 0);
   assert(s.st_size == 4);  // strlen("file")
-  assert(s.st_atime != 1200000000);  // should NOT match the utime call we did for dir/file
-  assert(s.st_mtime != 1200000000);
+  assert(s.st_atime != TEST_TIME);  // should NOT match the utime call we did for dir/file
+  assert(s.st_mtime != TEST_TIME);
   assert(s.st_ctime);
 #ifdef __EMSCRIPTEN__
   assert(s.st_blksize == 4096);
@@ -183,11 +187,11 @@ void test() {
   utime("folder/subdir", &t);
   create_file("folder/subdir/file", "abcdef", 0777);
   err = stat("folder/subdir", &s);
-  assert(s.st_mtime != 1200000000);
+  assert(s.st_mtime != TEST_TIME);
   utime("folder/subdir", &t);
   unlink("folder/subdir/file");
   err = stat("folder/subdir", &s);
-  assert(s.st_mtime != 1200000000);
+  assert(s.st_mtime != TEST_TIME);
 
   puts("success");
 }