diff --git a/src/header/time/constants.rs b/src/header/time/constants.rs
index 34f0056573..5c610ac230 100644
--- a/src/header/time/constants.rs
+++ b/src/header/time/constants.rs
@@ -1,7 +1,5 @@
 use crate::platform::types::*;
 
-pub use self::sys::*;
-
 #[cfg(target_os = "linux")]
 #[path = "linux.rs"]
 pub mod sys;
@@ -10,6 +8,8 @@ pub mod sys;
 #[path = "redox.rs"]
 pub mod sys;
 
+pub use self::sys::*;
+
 pub(crate) const UTC: *const c_char = b"UTC\0".as_ptr().cast();
 
 pub(crate) const DAY_NAMES: [&str; 7] = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
@@ -28,6 +28,6 @@ pub const TIMER_ABSTIME: c_int = 1;
 // The values are offset by one for simplicity since zero represents an error.
 
 /// `TIME_UTC` returns the time since the Unix epoch.
-pub const TIME_UTC: c_int = sys::CLOCK_REALTIME + 1;
+pub const TIME_UTC: c_int = CLOCK_REALTIME + 1;
 /// `TIME_MONOTONIC` returns the time from the monotonically increasing clock.
-pub const TIME_MONOTONIC: c_int = sys::CLOCK_MONOTONIC + 1;
+pub const TIME_MONOTONIC: c_int = CLOCK_MONOTONIC + 1;
diff --git a/tests/time/localtime_r.c b/tests/time/localtime_r.c
index 3d96f23a94..a874daee1e 100644
--- a/tests/time/localtime_r.c
+++ b/tests/time/localtime_r.c
@@ -7,6 +7,9 @@ void test_localtime_r_epoch() {
     time_t t = 0;  // Unix epoch (1970-01-01 00:00:00)
     struct tm result;
 
+    setenv("TZ", "UTC", 1);
+    tzset();
+
     assert(localtime_r(&t, &result) != NULL); 
     assert(result.tm_year == 70);   // Year 1970 - 1900
     assert(result.tm_mon == 0);     // January
@@ -22,6 +25,9 @@ void test_localtime_r_non_epoch() {
     time_t t = 1609459200;  // January 1, 2021 00:00:00 UTC (New Year 2021)
     struct tm result;
 
+    setenv("TZ", "UTC", 1);
+    tzset();
+
     assert(localtime_r(&t, &result) != NULL);
     assert(result.tm_year == 121);  // Year 2021 - 1900
     assert(result.tm_mon == 0);    // January
@@ -35,6 +41,9 @@ void test_localtime_r_dst() {
     time_t t = 1615708800;  // March 14 2021 08:00:00 UTC
     struct tm result;
 
+    setenv("TZ", "UTC", 1);
+    tzset();
+
     assert(localtime_r(&t, &result) != NULL);  // Ensure localtime_r does not fail
     assert(result.tm_year == 121);  // Year 2021 - 1900
     assert(result.tm_mon == 2);    // March
@@ -48,6 +57,9 @@ void test_localtime_r_large_time() {
     time_t t = 32503680000;  // A large value: 1 January 3000 (UTC)
     struct tm result;
 
+    setenv("TZ", "UTC", 1);
+    tzset();
+
     assert(localtime_r(&t, &result) != NULL);  // Ensure localtime_r does not fail
     assert(result.tm_year == 1100);  // Year 3000 - 1900 = 1100
     assert(result.tm_mon == 0);     // January
diff --git a/tests/time/timegm.c b/tests/time/timegm.c
index 96fed8e877..9fbfa89fac 100644
--- a/tests/time/timegm.c
+++ b/tests/time/timegm.c
@@ -4,6 +4,9 @@
 #include <assert.h>
 
 int main(void) {
+    setenv("TZ", "UTC", 1);
+    tzset();
+
     struct {
         time_t timestamp;
         const char *expected_asctime;