diff --git a/Sources/GPXKit/GPXExporter.swift b/Sources/GPXKit/GPXExporter.swift
index 81ed82f..f2a71f9 100644
--- a/Sources/GPXKit/GPXExporter.swift
+++ b/Sources/GPXKit/GPXExporter.swift
@@ -5,11 +5,6 @@ import FoundationXML
 
 /// A class for exporting a `GPXTrack` to an xml string.
 public final class GPXExporter {
-    private lazy var iso8601Formatter: ISO8601DateFormatter = {
-        let formatter = ISO8601DateFormatter()
-        formatter.formatOptions = .withInternetDateTime
-        return formatter
-    }()
     private let track: GPXTrack
     private let exportDate: Bool
 
@@ -45,7 +40,7 @@ public final class GPXExporter {
 
     private var metaDataTime: String {
         guard exportDate, let date = track.date else { return "" }
-        return GPXTags.time.embed(iso8601Formatter.string(from: date))
+        return GPXTags.time.embed(ISO8601DateFormatter.gpxKit.string(from: date))
     }
 
     private var trackXML: String {
@@ -58,7 +53,7 @@ public final class GPXExporter {
                 ].joined(separator: " ")
                 let childs = [GPXTags.elevation.embed(String(format:"%.2f", point.coordinate.elevation)),
                               exportDate ? point.date.flatMap {
-                    GPXTags.time.embed(iso8601Formatter.string(from: $0))
+                    GPXTags.time.embed(ISO8601DateFormatter.gpxKit.string(from: $0))
                 } : nil
                 ].compactMap { $0 }.joined(separator: "\n")
                 return GPXTags.trackPoint.embed(
diff --git a/Sources/GPXKit/GPXFileParser.swift b/Sources/GPXKit/GPXFileParser.swift
index 68ec1f3..f9eb1df 100644
--- a/Sources/GPXKit/GPXFileParser.swift
+++ b/Sources/GPXKit/GPXFileParser.swift
@@ -168,12 +168,6 @@ internal extension TrackPoint {
 }
 
 internal extension XMLNode {
-    static var iso8601Formatter: ISO8601DateFormatter = {
-        let formatter = ISO8601DateFormatter()
-        formatter.formatOptions = .withInternetDateTime
-        return formatter
-    }()
-
     var latitude: Double? {
         Double(attributes[GPXAttributes.latitude.rawValue] ?? "")
     }
@@ -184,7 +178,7 @@ internal extension XMLNode {
         Double(content)
     }
     var date: Date? {
-        XMLNode.iso8601Formatter.date(from: content)
+        ISO8601DateFormatter.gpxKit.date(from: content)
     }
     var power: Measurement<UnitPower>? {
         Double(content).flatMap {
diff --git a/Sources/GPXKit/ISO8601DateFormatter.swift b/Sources/GPXKit/ISO8601DateFormatter.swift
new file mode 100644
index 0000000..d7cb3b0
--- /dev/null
+++ b/Sources/GPXKit/ISO8601DateFormatter.swift
@@ -0,0 +1,13 @@
+import Foundation
+
+extension ISO8601DateFormatter {
+    static var gpxKit: ISO8601DateFormatter = {
+        let formatter = ISO8601DateFormatter()
+        if #available(macOS 10.13, *) {
+            formatter.formatOptions = .withFractionalSeconds
+        } else {
+            formatter.formatOptions = .withInternetDateTime
+        }
+        return formatter
+    }()
+}
diff --git a/Tests/GPXKitTests/GPXExporterTests.swift b/Tests/GPXKitTests/GPXExporterTests.swift
index e156063..17a394e 100644
--- a/Tests/GPXKitTests/GPXExporterTests.swift
+++ b/Tests/GPXKitTests/GPXExporterTests.swift
@@ -10,7 +10,7 @@ final class GPXExporterTests: XCTestCase {
     private var parseError: GPXParserError?
     private var iso8601Formatter: ISO8601DateFormatter = {
         let formatter = ISO8601DateFormatter()
-        formatter.formatOptions = .withInternetDateTime
+        formatter.formatOptions = .withFractionalSeconds
         return formatter
     }()
     private var result: GPXKit.XMLNode!
diff --git a/Tests/GPXKitTests/GPXParserTests.swift b/Tests/GPXKitTests/GPXParserTests.swift
index f9e29ee..90d0605 100644
--- a/Tests/GPXKitTests/GPXParserTests.swift
+++ b/Tests/GPXKitTests/GPXParserTests.swift
@@ -72,9 +72,9 @@ class GPXParserTests: XCTestCase {
 
         let expected = [
             TrackPoint(coordinate: Coordinate(latitude: 51.2760600, longitude: 12.3769500, elevation: 114.2),
-                       date: expectedDate(for: "2020-03-18T12:39:47Z")),
+                       date: expectedDate(for: "2020-07-03T13:20:50.000Z")),
             TrackPoint(coordinate: Coordinate(latitude: 51.2760420, longitude: 12.3769760, elevation: 114.0),
-                       date: expectedDate(for: "2020-03-18T12:39:48Z"))
+                       date: expectedDate(for: "2020-03-18T12:45:48Z"))
         ]
 
         assertTracksAreEqual(GPXTrack(date: expectedDate(for: "2020-03-18T12:39:47Z"),
diff --git a/Tests/GPXKitTests/TestFixtures.swift b/Tests/GPXKitTests/TestFixtures.swift
index 95c2ae8..509438a 100644
--- a/Tests/GPXKitTests/TestFixtures.swift
+++ b/Tests/GPXKitTests/TestFixtures.swift
@@ -50,11 +50,11 @@ let testXMLWithoutExtensions = """
                 <trkseg>
                     <trkpt lat="51.2760600" lon="12.3769500">
                         <ele>114.2</ele>
-                        <time>2020-03-18T12:39:47Z</time>
+                        <time>2020-07-03T13:20:50.000Z</time>
                     </trkpt>
                     <trkpt lat="51.2760420" lon="12.3769760">
                         <ele>114.0</ele>
-                        <time>2020-03-18T12:39:48Z</time>
+                        <time>2020-03-18T12:45:48Z</time>
                     </trkpt>
                 </trkseg>
             </trk>
@@ -107,7 +107,7 @@ let testTrack = GPXTrack(date: expectedDate(for: "2020-03-18T12:39:47Z"),
                             TrackPoint(coordinate: Coordinate(latitude: 51.2760600, longitude: 12.3769500, elevation: 114.2),
                                        date: expectedDate(for: "2020-03-18T12:39:47Z")),
                             TrackPoint(coordinate: Coordinate(latitude: 51.2760420, longitude: 12.3769760, elevation: 114.0),
-                                       date: expectedDate(for: "2020-03-18T12:39:48Z"))
+                                       date: expectedDate(for: "2020-03-18T12:45:48Z"))
                          ])
 
 let testTrackWithoutTime = GPXTrack(date: nil,
diff --git a/Tests/GPXKitTests/TestHelpers.swift b/Tests/GPXKitTests/TestHelpers.swift
index 9b4a221..dd7f3c0 100644
--- a/Tests/GPXKitTests/TestHelpers.swift
+++ b/Tests/GPXKitTests/TestHelpers.swift
@@ -33,7 +33,7 @@ public func XCTAssertEqual<T: Equatable>(_ expected: @autoclosure () throws -> T
 
 fileprivate var iso8601Formatter: ISO8601DateFormatter = {
     let formatter = ISO8601DateFormatter()
-    formatter.formatOptions = .withInternetDateTime
+    formatter.formatOptions = .withFractionalSeconds
     return formatter
 }()