diff --git a/Cargo.lock b/Cargo.lock
index f877be2..93b5fbe 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,15 +17,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "android_system_properties"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "async-trait"
 version = "0.1.61"
@@ -121,37 +112,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
-[[package]]
-name = "chrono"
-version = "0.4.23"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16b0a3d9ed01224b22057780a37bb8c5dbfe1be8ba48678e7bf57ec4b385411f"
-dependencies = [
- "iana-time-zone",
- "js-sys",
- "num-integer",
- "num-traits",
- "time 0.1.45",
- "wasm-bindgen",
- "winapi",
-]
-
-[[package]]
-name = "codespan-reporting"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
-dependencies = [
- "termcolor",
- "unicode-width",
-]
-
-[[package]]
-name = "core-foundation-sys"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5827cebf4670468b8772dd191856768aedcb1b0278a04f989f7766351917b9dc"
-
 [[package]]
 name = "cpufeatures"
 version = "0.2.5"
@@ -180,50 +140,6 @@ dependencies = [
  "typenum",
 ]
 
-[[package]]
-name = "cxx"
-version = "1.0.85"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5add3fc1717409d029b20c5b6903fc0c0b02fa6741d820054f4a2efa5e5816fd"
-dependencies = [
- "cc",
- "cxxbridge-flags",
- "cxxbridge-macro",
- "link-cplusplus",
-]
-
-[[package]]
-name = "cxx-build"
-version = "1.0.85"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4c87959ba14bc6fbc61df77c3fcfe180fc32b93538c4f1031dd802ccb5f2ff0"
-dependencies = [
- "cc",
- "codespan-reporting",
- "once_cell",
- "proc-macro2",
- "quote",
- "scratch",
- "syn",
-]
-
-[[package]]
-name = "cxxbridge-flags"
-version = "1.0.85"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69a3e162fde4e594ed2b07d0f83c6c67b745e7f28ce58c6df5e6b6bef99dfb59"
-
-[[package]]
-name = "cxxbridge-macro"
-version = "1.0.85"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e7e2adeb6a0d4a282e581096b06e1791532b7d576dcde5ccd9382acf55db8e6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "dashmap"
 version = "5.4.0"
@@ -384,7 +300,7 @@ checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
 ]
 
 [[package]]
@@ -507,30 +423,6 @@ dependencies = [
  "tokio-rustls",
 ]
 
-[[package]]
-name = "iana-time-zone"
-version = "0.1.53"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64c122667b287044802d6ce17ee2ddf13207ed924c712de9a66a5814d5b64765"
-dependencies = [
- "android_system_properties",
- "core-foundation-sys",
- "iana-time-zone-haiku",
- "js-sys",
- "wasm-bindgen",
- "winapi",
-]
-
-[[package]]
-name = "iana-time-zone-haiku"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0703ae284fc167426161c2e3f1da3ea71d94b21bedbcc9494e92b28e334e3dca"
-dependencies = [
- "cxx",
- "cxx-build",
-]
-
 [[package]]
 name = "idna"
 version = "0.3.0"
@@ -587,15 +479,6 @@ version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
 
-[[package]]
-name = "link-cplusplus"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecd207c9c713c34f95a097a5b029ac2ce6010530c7b49d7fea24d977dede04f5"
-dependencies = [
- "cc",
-]
-
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -654,20 +537,10 @@ checksum = "e5d732bc30207a6423068df043e3d02e0735b155ad7ce1a6f76fe2baa5b158de"
 dependencies = [
  "libc",
  "log",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "windows-sys",
 ]
 
-[[package]]
-name = "num-integer"
-version = "0.1.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
-dependencies = [
- "autocfg",
- "num-traits",
-]
-
 [[package]]
 name = "num-traits"
 version = "0.2.15"
@@ -912,12 +785,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
-[[package]]
-name = "scratch"
-version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddccb15bcce173023b3fedd9436f882a0739b8dfb45e4f6b6002bee5929f61b2"
-
 [[package]]
 name = "sct"
 version = "0.7.0"
@@ -1004,7 +871,7 @@ dependencies = [
  "serde",
  "serde-value",
  "serde_json",
- "time 0.3.17",
+ "time",
  "tokio",
  "tracing",
  "typemap_rev",
@@ -1060,12 +927,12 @@ dependencies = [
 name = "spamcontest"
 version = "0.1.0"
 dependencies = [
- "chrono",
  "dashmap",
  "env_logger",
  "itertools",
  "log",
  "serenity",
+ "time",
  "tokio",
 ]
 
@@ -1115,17 +982,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "time"
-version = "0.1.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b797afad3f312d1c66a56d11d0316f916356d11bd158fbc6ca6389ff6bf805a"
-dependencies = [
- "libc",
- "wasi 0.10.0+wasi-snapshot-preview1",
- "winapi",
-]
-
 [[package]]
 name = "time"
 version = "0.3.17"
@@ -1331,12 +1187,6 @@ dependencies = [
  "tinyvec",
 ]
 
-[[package]]
-name = "unicode-width"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
-
 [[package]]
 name = "untrusted"
 version = "0.7.1"
@@ -1377,12 +1227,6 @@ dependencies = [
  "try-lock",
 ]
 
-[[package]]
-name = "wasi"
-version = "0.10.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
diff --git a/Cargo.toml b/Cargo.toml
index 27ca13d..03bbd5b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2021"
 [dependencies]
 log = "0.4"
 env_logger = "0.9"
-chrono = "0.4"
+time = "0.3.17"
 itertools = "0.10"
 tokio = {version = "1.20", features = ["rt-multi-thread", "signal"]}
 dashmap = "5.3.4"
diff --git a/src/lib.rs b/src/lib.rs
index 8f3c49c..c9048d9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,7 @@ use std::collections::HashMap;
 use std::fmt::Display;
 use std::ops::RangeInclusive;
 use std::time::Duration;
+use time::OffsetDateTime;
 use tokio::sync::mpsc;
 
 const DEFAULT_CONTEST_DURATION: Duration = Duration::from_secs(60);
@@ -164,8 +165,7 @@ async fn run_contest(
     contests: &Contests,
     pin: bool,
 ) -> serenity::Result<Contest> {
-    let end_timestamp =
-        (chrono::Utc::now() + chrono::Duration::from_std(duration).unwrap()).timestamp() + 1;
+    let end_timestamp = (OffsetDateTime::now_utc() + duration).unix_timestamp();
 
     // send announcement message
     let announcement = channel_id