diff --git a/Cargo.toml b/Cargo.toml
index 1fe91a5..376f268 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pkix"
-version = "0.1.3"
+version = "0.2.0"
 authors = ["Fortanix Inc."]
 license = "MPL-2.0"
 description = "TLS Certificate encoding and decoding helpers."
@@ -15,7 +15,7 @@ num-bigint = { version = "0.2", default-features = false }
 num-integer = { version = "0.1", default-features = false }
 bit-vec = "0.6"
 lazy_static = "1"
-chrono = "0.4"
+chrono = "0.4.23"
 b64-ct = "0.1.1"
 
 [dev-dependencies]
diff --git a/src/types.rs b/src/types.rs
index e9c1543..5ba3a2b 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -658,12 +658,16 @@ impl Into<chrono::DateTime<Utc>> for DateTime {
 }
 
 impl DateTime {
-    pub fn new(year: u16, month: u8, day: u8, hour: u8, minute: u8, second: u8) -> Self {
-        DateTime(Utc.ymd(year.into(), month.into(), day.into()).and_hms(hour.into(), minute.into(), second.into()))
+    pub fn new(year: u16, month: u8, day: u8, hour: u8, minute: u8, second: u8) -> Option<Self> {
+        Utc.with_ymd_and_hms(year.into(), month.into(), day.into(), hour.into(), minute.into(), second.into())
+            .earliest()
+            .map(Self)
     }
 
-    pub fn from_seconds_since_epoch(seconds: i64) -> Self {
-        DateTime(Utc.timestamp(seconds, 0))
+    pub fn from_seconds_since_epoch(seconds: i64) -> Option<Self> {
+        Utc.timestamp_opt(seconds, 0)
+            .earliest()
+            .map(Self)
     }
 
     pub fn to_seconds_since_epoch(&self) -> i64 {
@@ -744,7 +748,8 @@ impl BERDecodable for DateTime {
         let minute = iter.next().ok_or(ASN1Error::new(ASN1ErrorKind::Invalid))?;
         let second = iter.next().ok_or(ASN1Error::new(ASN1ErrorKind::Invalid))?;
 
-        Ok(DateTime::new(year, month, day, hour, minute, second))
+        DateTime::new(year, month, day, hour, minute, second)
+            .ok_or(ASN1Error::new(ASN1ErrorKind::Invalid))
     }
 }
 
@@ -974,7 +979,7 @@ mod tests {
 
     #[test]
     fn datetime() {
-        let datetime = DateTime::new(2017, 5, 19, 12, 34, 56);
+        let datetime = DateTime::new(2017, 5, 19, 12, 34, 56).unwrap();
 
         let der = vec![0x17, 0x0d, 0x31, 0x37, 0x30, 0x35, 0x31, 0x39, 0x31, 0x32, 0x33, 0x34,
                        0x35, 0x36, 0x5a];
diff --git a/tests/fakes.rs b/tests/fakes.rs
index 9e59ab5..c044161 100644
--- a/tests/fakes.rs
+++ b/tests/fakes.rs
@@ -115,8 +115,8 @@ pub fn cert(get_random_printable_string: fn(usize) -> Vec<u8>)
                 issuer:
                     vec![(oid::dnQualifier.clone(),
                           TaggedDerValue::from_tag_and_bytes(TAG_PRINTABLESTRING, get_random_printable_string(42)))].into(),
-                validity_notbefore: DateTime::new(1970, 1, 1, 0, 0, 0),
-                validity_notafter: DateTime::new(1970, 1, 1, 0, 0, 0),
+                validity_notbefore: DateTime::new(1970, 1, 1, 0, 0, 0).unwrap(),
+                validity_notafter: DateTime::new(1970, 1, 1, 0, 0, 0).unwrap(),
                 subject:
                     vec![(oid::description.clone(),
                           TaggedDerValue::from_tag_and_bytes(TAG_UTF8STRING, b"Known keys only".to_vec())),