diff --git a/Cargo.lock b/Cargo.lock
index a9da406ff..5d87f13cd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1896,6 +1896,8 @@ dependencies = [
 name = "uptime"
 version = "0.0.1"
 dependencies = [
+ "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.2 (git+https://github.com/uutils/uucore/?tag=0.0.2)",
diff --git a/src/uu/uptime/Cargo.toml b/src/uu/uptime/Cargo.toml
index 93bcd4349..0cb110878 100644
--- a/src/uu/uptime/Cargo.toml
+++ b/src/uu/uptime/Cargo.toml
@@ -12,6 +12,8 @@ path = "src/uptime.rs"
 [dependencies]
 getopts = "0.2.18"
 time = "0.1.40"
+chrono = "0.4"
+clap = "2.32"
 uucore = { version = "0.0.2", features = ["utmpx"] }
 
 [[bin]]
diff --git a/src/uu/uptime/src/uptime.rs b/src/uu/uptime/src/uptime.rs
index 186de7593..94cbaba33 100644
--- a/src/uu/uptime/src/uptime.rs
+++ b/src/uu/uptime/src/uptime.rs
@@ -12,19 +12,24 @@
 
 /* last synced with: cat (GNU coreutils) 8.13 */
 
-extern crate getopts;
+extern crate chrono;
+extern crate clap;
 extern crate time;
 
+use chrono::{Local, TimeZone, Utc};
+use clap::{App, Arg};
+
 #[macro_use]
 extern crate uucore;
 // import crate time from utmpx
 pub use uucore::libc;
 use uucore::libc::time_t;
 
-use getopts::Options;
-
-static NAME: &str = "uptime";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
+static ABOUT: &str = "Print the current time, the length of time the system has been up,\n\
+the number of users on the system, and the average number of jobs\n\
+in the run queue over the last 1, 5 and 15 minutes.";
+static OPT_SINCE: &str = "SINCE";
 
 #[cfg(unix)]
 use libc::getloadavg;
@@ -34,38 +39,24 @@ extern "C" {
     fn GetTickCount() -> libc::uint32_t;
 }
 
+fn get_usage() -> String {
+    format!("{0} [OPTION]...", executable!())
+}
+
 pub fn uumain(args: Vec<String>) -> i32 {
-    let mut opts = Options::new();
+    let usage = get_usage();
+    let matches = App::new(executable!())
+        .version(VERSION)
+        .about(ABOUT)
+        .usage(&usage[..])
+        .arg(
+            Arg::with_name(OPT_SINCE)
+                .short("s")
+                .long("since")
+                .help("system up since"),
+        )
+        .get_matches_from(&args);
 
-    opts.optflag("v", "version", "output version information and exit");
-    opts.optflag("h", "help", "display this help and exit");
-
-    let matches = match opts.parse(&args[1..]) {
-        Ok(m) => m,
-        Err(f) => crash!(1, "Invalid options\n{}", f),
-    };
-    if matches.opt_present("version") {
-        println!("{} {}", NAME, VERSION);
-        return 0;
-    }
-    if matches.opt_present("help") || !matches.free.is_empty() {
-        println!("{} {}", NAME, VERSION);
-        println!();
-        println!("Usage:");
-        println!("  {0} [OPTION]", NAME);
-        println!();
-        println!(
-            "{}",
-            opts.usage(
-                "Print the current time, the length of time the system has been up,\n\
-                 the number of users on the system, and the average number of jobs\n\
-                 in the run queue over the last 1, 5 and 15 minutes."
-            )
-        );
-        return 0;
-    }
-
-    print_time();
     let (boot_time, user_count) = process_utmpx();
     let uptime = get_uptime(boot_time);
     if uptime < 0 {
@@ -73,7 +64,14 @@ pub fn uumain(args: Vec<String>) -> i32 {
 
         1
     } else {
-        let upsecs = uptime / 100;
+        if matches.is_present(OPT_SINCE) {
+            let initial_date = Local.timestamp(Utc::now().timestamp() - uptime, 0);
+            println!("{}", initial_date.format("%Y-%m-%d %H:%M:%S"));
+            return 0;
+        }
+
+        print_time();
+        let upsecs = uptime;
         print_uptime(upsecs);
         print_nusers(user_count);
         print_loadavg();
@@ -164,7 +162,7 @@ fn get_uptime(boot_time: Option<time_t>) -> i64 {
         .ok()
         .and_then(|mut f| f.read_to_string(&mut proc_uptime).ok())
         .and_then(|_| proc_uptime.split_whitespace().next())
-        .and_then(|s| s.replace(".", "").parse().ok())
+        .and_then(|s| s.split('.').next().unwrap_or("0").parse().ok())
     {
         n
     } else {
@@ -172,7 +170,7 @@ fn get_uptime(boot_time: Option<time_t>) -> i64 {
             Some(t) => {
                 let now = time::get_time().sec;
                 let boottime = t as i64;
-                (now - boottime) * 100
+                (now - boottime)
             }
             _ => -1,
         }
diff --git a/tests/test_uptime.rs b/tests/test_uptime.rs
index 95436fb25..b2d5c8a2f 100644
--- a/tests/test_uptime.rs
+++ b/tests/test_uptime.rs
@@ -1,3 +1,5 @@
+extern crate regex;
+use self::regex::Regex;
 use common::util::*;
 
 #[test]
@@ -12,3 +14,17 @@ fn test_uptime() {
     assert!(result.stdout.contains(" up "));
     // Don't check for users as it doesn't show in some CI
 }
+
+#[test]
+fn test_uptime_since() {
+    let scene = TestScenario::new(util_name!());
+
+    let result = scene.ucmd().arg("--since").succeeds();
+
+    println!("stdout = {}", result.stdout);
+    println!("stderr = {}", result.stderr);
+
+    assert!(result.success);
+    let re = Regex::new(r"\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}").unwrap();
+    assert!(re.is_match(&result.stdout.trim()));
+}