diff --git a/Cargo.toml b/Cargo.toml
index 2a42272..ce44839 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rust_util"
-version = "0.1.0"
+version = "0.2.0"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"
diff --git a/src/lib.rs b/src/lib.rs
index a11b005..bc47f5f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,6 +13,15 @@ pub mod util_cmd;
 pub mod util_msg;
 pub mod util_size;
 pub mod util_file;
+pub mod util_time;
+
+/// iff!(condition, result_when_true, result_when_false)
+#[macro_export]
+macro_rules! iff {
+    ($c:expr, $t:expr, $f:expr) => {
+        if $c { $t } else { $f }
+    };
+}
 
 pub type XResult<T> = Result<T, Box<dyn std::error::Error>>;
 
diff --git a/src/util_time.rs b/src/util_time.rs
new file mode 100644
index 0000000..8849d0e
--- /dev/null
+++ b/src/util_time.rs
@@ -0,0 +1,9 @@
+use std::time::SystemTime;
+
+pub fn get_current_secs() -> u64 {
+    SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs()
+}
+
+pub fn get_current_millis() -> u128 {
+    SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_millis()
+}