diff --git a/.gitignore b/.gitignore
index 0e03e15..af13669 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /.build/
+/.swiftpm/
diff --git a/Sources/Draft201909Validator.swift b/Sources/Draft201909Validator.swift
index 29f6f2b..0d2df86 100644
--- a/Sources/Draft201909Validator.swift
+++ b/Sources/Draft201909Validator.swift
@@ -58,6 +58,7 @@ public class Draft201909Validator: Validator {
     "ipv4": validateIPv4,
     "ipv6": validateIPv6,
     "uri": validateURI,
+    "date-time": validateDateTime,
     "uuid": validateUUID,
     "regex": validateRegex,
     "json-pointer": validateJSONPointer,
diff --git a/Sources/Draft202012Validator.swift b/Sources/Draft202012Validator.swift
index eb2acda..21f72f4 100644
--- a/Sources/Draft202012Validator.swift
+++ b/Sources/Draft202012Validator.swift
@@ -56,6 +56,7 @@ public class Draft202012Validator: Validator {
   ]
 
   let formats: [String: (Context, String) -> (AnySequence<ValidationError>)] = [
+    "date-time": validateDateTime,
     "ipv4": validateIPv4,
     "ipv6": validateIPv6,
     "uri": validateURI,
diff --git a/Sources/Draft7Validator.swift b/Sources/Draft7Validator.swift
index ae0cceb..071f28d 100644
--- a/Sources/Draft7Validator.swift
+++ b/Sources/Draft7Validator.swift
@@ -48,6 +48,7 @@ public class Draft7Validator: Validator {
     "ipv4": validateIPv4,
     "ipv6": validateIPv6,
     "uri": validateURI,
+    "date-time": validateDateTime,
     "json-pointer": validateJSONPointer,
     "regex": validateRegex,
     "time": validateTime,
diff --git a/Sources/Validation/datetime.swift b/Sources/Validation/datetime.swift
new file mode 100644
index 0000000..45250d6
--- /dev/null
+++ b/Sources/Validation/datetime.swift
@@ -0,0 +1,46 @@
+import Foundation
+
+func validateDateTime(_ context: Context, _ value: Any) -> AnySequence<ValidationError> {
+  if let date = value as? String {
+    if let regularExpression = try? NSRegularExpression(pattern: "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}", options: .caseInsensitive) {
+      let range = NSRange(location: 0, length: date.utf16.count)
+      let result = regularExpression.matches(in: date, options: [], range: range)
+      if result.isEmpty  {
+        return AnySequence([
+          ValidationError(
+              "'\(date)' is not a valid RFC 3339 formatted date.",
+            instanceLocation: context.instanceLocation,
+            keywordLocation: context.keywordLocation
+          )
+        ])
+      }
+    }
+
+    let rfc3339DateTimeFormatter = DateFormatter()
+
+    rfc3339DateTimeFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
+    if rfc3339DateTimeFormatter.date(from: date) != nil {
+      return AnySequence(EmptyCollection())
+    }
+
+    rfc3339DateTimeFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ"
+    if rfc3339DateTimeFormatter.date(from: date) != nil {
+      return AnySequence(EmptyCollection())
+    }
+
+    rfc3339DateTimeFormatter.dateFormat = "yyyy-MM-dd't'HH:mm:ss.SSS'z'"
+    if rfc3339DateTimeFormatter.date(from: date) != nil {
+      return AnySequence(EmptyCollection())
+    }
+
+    return AnySequence([
+      ValidationError(
+        "'\(date)' is not a valid RFC 3339 formatted date-time.",
+        instanceLocation: context.instanceLocation,
+        keywordLocation: context.keywordLocation
+      )
+    ])
+  }
+
+  return AnySequence(EmptyCollection())
+}
diff --git a/Sources/Validators.swift b/Sources/Validators.swift
index b289ce6..aacf912 100644
--- a/Sources/Validators.swift
+++ b/Sources/Validators.swift
@@ -145,7 +145,6 @@ func isEqual(_ lhs: NSObject, _ rhs: NSObject) -> Bool {
   return lhs == rhs
 }
 
-
 extension Sequence where Iterator.Element == ValidationError {
   func validationResult() -> ValidationResult {
     let errors = Array(self)
diff --git a/Sources/format.swift b/Sources/format.swift
index 136c990..d460c8f 100644
--- a/Sources/format.swift
+++ b/Sources/format.swift
@@ -146,3 +146,38 @@ func validateJSONPointer(_ context: Context, _ value: String) -> AnySequence<Val
 
   return AnySequence(EmptyCollection())
 }
+
+func validateDate(_ context: Context, _ value: Any) -> AnySequence<ValidationError> {
+  if let date = value as? String {
+    if let regularExpression = try? NSRegularExpression(pattern: "^\\d{4}-\\d{2}-\\d{2}$", options: []) {
+      let range = NSRange(location: 0, length: date.utf16.count)
+      let result = regularExpression.matches(in: date, options: [], range: range)
+      if result.isEmpty  {
+        return AnySequence([
+          ValidationError(
+            "'\(date)' is not a valid RFC 3339 formatted date.",
+            instanceLocation: context.instanceLocation,
+            keywordLocation: context.keywordLocation
+          )
+        ])
+      }
+    }
+
+    let rfc3339DateTimeFormatter = DateFormatter()
+
+    rfc3339DateTimeFormatter.dateFormat = "yyyy-MM-dd"
+    if rfc3339DateTimeFormatter.date  (from: date) != nil {
+      return AnySequence(EmptyCollection())
+    }
+
+    return AnySequence([
+      ValidationError(
+          "'\(date)' is not a valid RFC 3339 formatted date.",
+        instanceLocation: context.instanceLocation,
+        keywordLocation: context.keywordLocation
+      )
+    ])
+  }
+
+  return AnySequence(EmptyCollection())
+}
diff --git a/Tests/Cases b/Tests/Cases
index 812f1f0..77f1d10 160000
--- a/Tests/Cases
+++ b/Tests/Cases
@@ -1 +1 @@
-Subproject commit 812f1f08c3dbf9c760c716ced2f314ca15afb198
+Subproject commit 77f1d10cbb23b2f4d2bbf50ca1d5cf3804cb2ce4
diff --git a/Tests/JSONSchemaTests/Validation/TestTime.swift b/Tests/JSONSchemaTests/Validation/TestTime.swift
new file mode 100644
index 0000000..1817cbe
--- /dev/null
+++ b/Tests/JSONSchemaTests/Validation/TestTime.swift
@@ -0,0 +1,16 @@
+import XCTest
+@testable import JSONSchema
+
+
+class TimeFormatTests: XCTestCase {
+  func testTimeWithoutSecondFraction() throws {
+    let schema: [String: Any] = [
+      "$schema": "https://json-schema.org/draft/2020-12/schema",
+      "format": "time",
+    ]
+
+    let result = try validate("23:59:50Z", schema: schema)
+
+    XCTAssertTrue(result.valid)
+  }
+}