diff --git a/tools/tlv_tool/Cargo.toml b/tools/tlv_tool/Cargo.toml
index 2aaabe8..f8c1e23 100644
--- a/tools/tlv_tool/Cargo.toml
+++ b/tools/tlv_tool/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-matter-iot= { path = "../../matter" }
+matter-iot = { path = "../../matter" }
 log = {version = "0.4.14", features = ["max_level_trace", "release_max_level_warn"]}
 simple_logger = "1.16.0"
 clap = "2.34"
diff --git a/tools/tlv_tool/src/main.rs b/tools/tlv_tool/src/main.rs
index 821e0d0..cc08cb4 100644
--- a/tools/tlv_tool/src/main.rs
+++ b/tools/tlv_tool/src/main.rs
@@ -15,13 +15,12 @@
  *    limitations under the License.
  */
 
-extern crate clap;
 use clap::{App, Arg};
 use matter::cert;
 use matter::tlv;
+use matter::utils::epoch::sys_utc_calendar;
 use simple_logger::SimpleLogger;
 use std::process;
-use std::u8;
 
 fn main() {
     SimpleLogger::new()
@@ -96,7 +95,7 @@ fn main() {
     } else if m.is_present("as-asn1") {
         let mut asn1_cert = [0_u8; 1024];
         let cert = cert::Cert::new(&tlv_list[..index]).unwrap();
-        let len = cert.as_asn1(&mut asn1_cert).unwrap();
+        let len = cert.as_asn1(&mut asn1_cert, sys_utc_calendar).unwrap();
         println!("{:02x?}", &asn1_cert[..len]);
     } else {
         tlv::print_tlv_list(&tlv_list[..index]);