diff --git a/src/core/config/Categories.js b/src/core/config/Categories.js
index ea095649..2484b834 100755
--- a/src/core/config/Categories.js
+++ b/src/core/config/Categories.js
@@ -193,6 +193,8 @@ const Categories = [
             "Translate DateTime Format",
             "From UNIX Timestamp",
             "To UNIX Timestamp",
+            "Windows Filetime to UNIX Timestamp",
+            "UNIX Timestamp to Windows Filetime",
             "Extract dates",
         ]
     },
diff --git a/src/core/config/OperationConfig.js b/src/core/config/OperationConfig.js
index 0d6778fc..9115f0de 100755
--- a/src/core/config/OperationConfig.js
+++ b/src/core/config/OperationConfig.js
@@ -2261,6 +2261,32 @@ const OperationConfig = {
             }
         ]
     },
+    "Windows Filetime to UNIX Timestamp":{
+        description: "Converts a Windows Filetime timestamp to a datetime format",
+        run: DateTime.runFromFiletimeToUnix,
+        inputType: "string",
+        outputType: "string",
+        args: [
+            {
+                name: "Output Units",
+                type: "Option",
+                value: DateTime.UNITS
+            }
+        ]
+    },
+    "UNIX Timestamp to Windows Filetime":{
+        description: "Parses a datetime string in UTC and returns the corresponding Windows Filetime timestamp",
+        run: DateTime.runToFiletimeFromUnix,
+        inputType: "string",
+        outputType: "string",
+        args: [
+            {
+                name: "Input Units",
+                type: "Option",
+                value: DateTime.UNITS
+            }
+        ]
+    },
     "Translate DateTime Format": {
         description: "Parses a datetime string in one format and re-writes it in another.<br><br>Run with no input to see the relevant format string examples.",
         run: DateTime.runTranslateFormat,
diff --git a/src/core/operations/DateTime.js b/src/core/operations/DateTime.js
index 523206b2..a7a3c483 100755
--- a/src/core/operations/DateTime.js
+++ b/src/core/operations/DateTime.js
@@ -1,3 +1,5 @@
+import {BigInteger} from "jsbn";
+
 /**
  * Date and time operations.
  *
@@ -78,6 +80,58 @@ const DateTime = {
     },
 
 
+    /**
+     * Converts a Windows FILETIME to Unix Epoch time.
+     *
+     * @author bwhitn [brian.m.whitney@outlook.com]
+     * @param {string} input
+     * @param {Object[]} args (not used)
+     * @returns {string}
+     */
+    runFromFiletimeToUnix: function(input, args) {
+        let units = args[0];
+        input = new BigInteger(input).subtract(new BigInteger("116444736000000000"));
+        if (units === "Seconds (s)"){
+            input = input.divide(new BigInteger("10000000"));
+        } else if (units === "Milliseconds (ms)") {
+            input = input.divide(new BigInteger("10000"));
+        } else if (units === "Microseconds (μs)") {
+            input = input.divide(new BigInteger("10"));
+        } else if (units === "Nanoseconds (ns)") {
+            input = input.multiply(new BigInteger("100"));
+        } else {
+            throw "Unrecognised unit";
+        }
+        return input.toString();
+    },
+
+
+    /**
+     * Converts a Unix Epoch time to Windows FILETIME.
+     *
+     * @author bwhitn [brian.m.whitney@outlook.com]
+     * @param {string} input
+     * @param {Object[]} args (not used)
+     * @returns {string}
+     */
+    runToFiletimeFromUnix: function(input, args) {
+        let units = args[0];
+        input = new BigInteger(input);
+        if (units === "Seconds (s)"){
+            input = input.multiply(new BigInteger("10000000"));
+        } else if (units === "Milliseconds (ms)") {
+            input = input.multiply(new BigInteger("10000"));
+        } else if (units === "Microseconds (μs)") {
+            input = input.multiply(new BigInteger("10"));
+        } else if (units === "Nanoseconds (ns)") {
+            input = input.divide(new BigInteger("100"));
+        } else {
+            throw "Unrecognised unit";
+        }
+        return input.add(new BigInteger("116444736000000000")).toString();
+    },
+
+
     /**
      * @constant
      * @default
diff --git a/test/index.js b/test/index.js
index dba360ca..dbf1393d 100644
--- a/test/index.js
+++ b/test/index.js
@@ -16,6 +16,7 @@ import "./tests/operations/ByteRepr.js";
 import "./tests/operations/CharEnc.js";
 import "./tests/operations/Code.js";
 import "./tests/operations/Compress.js";
+import "./tests/operations/DateTime.js";
 import "./tests/operations/FlowControl.js";
 import "./tests/operations/Image.js";
 import "./tests/operations/MorseCode.js";
diff --git a/test/tests/operations/DateTime.js b/test/tests/operations/DateTime.js
new file mode 100644
index 00000000..7ee445ff
--- /dev/null
+++ b/test/tests/operations/DateTime.js
@@ -0,0 +1,34 @@
+/**
+ * DateTime tests.
+ *
+ * @author bwhitn [brian.m.whitney@outlook.com]
+ *
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ */
+import TestRegister from "../../TestRegister.js";
+
+TestRegister.addTests([
+    {
+        name: "Filetime to Unix",
+        input: "129207366395297693",
+        expectedOutput: "1276263039529769300",
+        recipeConfig: [
+            {
+                op: "Windows Filetime to UNIX Timestamp",
+                args: ["Nanoseconds (ns)"],
+            },
+        ],
+    },
+    {
+        name: "Unix to Filetime",
+        input: "1276263039529769300",
+        expectedOutput: "129207366395297693",
+        recipeConfig: [
+            {
+                op: "UNIX Timestamp to Windows Filetime",
+                args: ["Nanoseconds (ns)"],
+            },
+        ],
+    },
+]);