diff --git a/src/main/java/com/icoderman/woocommerce/oauth/OAuthSignature.java b/src/main/java/com/icoderman/woocommerce/oauth/OAuthSignature.java
index 1cb5997..6a9929a 100644
--- a/src/main/java/com/icoderman/woocommerce/oauth/OAuthSignature.java
+++ b/src/main/java/com/icoderman/woocommerce/oauth/OAuthSignature.java
@@ -38,7 +38,7 @@ public static Map<String, String> getAsMap(OAuthConfig config, String endpoint,
         authParams.put(OAuthHeader.OAUTH_TIMESTAMP.getValue(), String.valueOf(System.currentTimeMillis() / 1000L));
         authParams.put(OAuthHeader.OAUTH_NONCE.getValue(), UUID.randomUUID().toString());
         authParams.put(OAuthHeader.OAUTH_SIGNATURE_METHOD.getValue(), SIGNATURE_METHOD_HMAC_SHA256);
-        authParams.putAll(params);
+        authParams.putAll(colonEncodeValue(params));
 
         // WooCommerce specified param
         if (HttpMethod.DELETE.equals(httpMethod)) {
@@ -139,4 +139,14 @@ private static String percentEncode(String s) {
     private static Map<String, String> getSortedParameters(Map<String, String> parameters) {
         return new TreeMap<>(parameters);
     }
+
+    private static Map<String, String> colonEncodeValue(Map<String, String> parameter) {
+        Map<String, String> encoded = new HashMap<>();
+
+        for (Map.Entry<String, String> param : parameter.entrySet()) {
+            encoded.put(param.getKey(), param.getValue().replace(SpecialSymbol.COLON.getPlain(), SpecialSymbol.COLON.getEncoded()));
+        }
+
+        return encoded;
+    }
 }
diff --git a/src/main/java/com/icoderman/woocommerce/oauth/SpecialSymbol.java b/src/main/java/com/icoderman/woocommerce/oauth/SpecialSymbol.java
index c677460..fe80867 100644
--- a/src/main/java/com/icoderman/woocommerce/oauth/SpecialSymbol.java
+++ b/src/main/java/com/icoderman/woocommerce/oauth/SpecialSymbol.java
@@ -9,7 +9,8 @@ public enum SpecialSymbol {
     EQUAL("=", "%3D"),
     PLUS("+", "%2B"),
     STAR("*", "%2A"),
-    TILDE("~", "%7E");
+    TILDE("~", "%7E"),
+    COLON(":", "%3A");
 
     private String plain;
     private String encoded;
diff --git a/src/test/java/com/icoderman/woocommerce/integration/WooCommerceClientTest.java b/src/test/java/com/icoderman/woocommerce/integration/WooCommerceClientTest.java
index be37195..f5496f6 100644
--- a/src/test/java/com/icoderman/woocommerce/integration/WooCommerceClientTest.java
+++ b/src/test/java/com/icoderman/woocommerce/integration/WooCommerceClientTest.java
@@ -47,6 +47,8 @@ public void apiGetAllProductsTest() {
         Map<String, String> params = new HashMap<>();
         params.put("per_page","100");
         params.put("offset","0");
+        params.put("after",  "2020-01-01T00:00:00.000Z");
+        params.put("before", "2020-01-15T00:00:00.000Z");
         Object products = wooCommerce.getAll(EndpointBaseType.PRODUCTS.getValue(), params);
         Assert.assertNotNull(products);
     }