diff --git a/Cargo.toml b/Cargo.toml
index 4515626..4924f91 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rust_util"
-version = "0.6.41"
+version = "0.6.42"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"
diff --git a/src/util_time.rs b/src/util_time.rs
index 89cbaf2..13f01d0 100644
--- a/src/util_time.rs
+++ b/src/util_time.rs
@@ -1,11 +1,19 @@
-use std::time::{SystemTime, Duration};
+use std::time::{Duration, SystemTime};
 
 pub fn get_current_secs() -> u64 {
-    SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0 /* SHOULD NOT HAPPEN */)
+    get_secs(&SystemTime::now())
 }
 
 pub fn get_current_millis() -> u128 {
-    SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).map(|d| d.as_millis()).unwrap_or(0 /* SHOULD NOT HAPPEN */)
+    get_millis(&SystemTime::now())
+}
+
+pub fn get_secs(system_time: &SystemTime) -> u64 {
+    system_time.duration_since(SystemTime::UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0 /* SHOULD NOT HAPPEN */)
+}
+
+pub fn get_millis(system_time: &SystemTime) -> u128 {
+    system_time.duration_since(SystemTime::UNIX_EPOCH).map(|d| d.as_millis()).unwrap_or(0 /* SHOULD NOT HAPPEN */)
 }
 
 pub fn parse_duration(t: &str) -> Option<Duration> {
@@ -26,12 +34,12 @@ pub fn parse_duration(t: &str) -> Option<Duration> {
 
 #[test]
 fn test_get_current_secs() {
-    assert!(get_current_secs() != 0);
+    assert_ne!(get_current_secs(), 0);
 }
 
 #[test]
 fn test_get_current_millis() {
-    assert!(get_current_millis() != 0);
+    assert_ne!(get_current_millis(), 0);
 }
 
 #[test]