diff --git a/types/react-tooltip/index.d.ts b/types/react-tooltip/index.d.ts
index e9690b8f5c..044e737402 100644
--- a/types/react-tooltip/index.d.ts
+++ b/types/react-tooltip/index.d.ts
@@ -39,7 +39,7 @@ declare namespace ReactTooltip {
     type ElementEvents = (keyof HTMLElementEventMap) | string;
     type WindowEvents = (keyof WindowEventMap) | string;
 
-    type GetContentCallback = () => React.ReactNode;
+    type GetContentCallback = (dataTip: string) => React.ReactNode;
     type GetContent = GetContentCallback | [GetContentCallback, number];
 
     type Place = "top" | "right" | "bottom" | "left";
diff --git a/types/react-tooltip/react-tooltip-tests.tsx b/types/react-tooltip/react-tooltip-tests.tsx
index 97b7a085ea..313804c901 100644
--- a/types/react-tooltip/react-tooltip-tests.tsx
+++ b/types/react-tooltip/react-tooltip-tests.tsx
@@ -8,7 +8,7 @@ export class ReactTooltipTest extends React.PureComponent {
     }
 
     render() {
-        const getContent: ReactTooltip.GetContent = [() => Math.floor(Math.random() * 100), 30];
+        const getContent: ReactTooltip.GetContent = [dataTip => Math.floor(Math.random() * 100), 30];
 
         return <div>
             <a data-tip data-for="happyFace"> d(`･∀･)b </a>
@@ -53,8 +53,8 @@ export class ReactTooltipTest extends React.PureComponent {
             <a data-for="getContent" data-tip>=( •̀д•́)</a>
             <ReactTooltip id="getContent" getContent={getContent} />
 
-            <a data-for="overTime" data-tip>=( •̀д•́)</a>
-            <ReactTooltip id="overTime" wrapper="span" getContent={[() => new Date().toISOString(), 1000]} />
+            <a data-for="overTime" data-tip="3/14/1592">=( •̀д•́)</a>
+            <ReactTooltip id="overTime" wrapper="span" getContent={[dateString => new Date(dateString).toISOString(), 1000]} />
 
             <a data-tip data-for="happyFace"> d(`･∀･)b </a>
             <ReactTooltip