---
description: Convert timestamp to hexadecimal format and send it as a custom header to the origin.
title: Send timestamp to origin as a custom header
image: https://developers.cloudflare.com/og-docs.png
---

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# Send timestamp to origin as a custom header

Convert timestamp to hexadecimal format and send it as a custom header to the origin.

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/rules/snippets/examples/send-timestamp-to-origin/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

```js
export default {
	async fetch(request) {
		// Get the current timestamp
		const timestamp = Date.now();

		// Convert the timestamp to hexadecimal format
		const hexTimestamp = timestamp.toString(16);

		// Clone the request and add the custom header
		const modifiedRequest = new Request(request, {
			headers: new Headers(request.headers),
		});
		modifiedRequest.headers.set("X-Hex-Timestamp", hexTimestamp);

		// Log the custom header for debugging
		console.log(`X-Hex-Timestamp: ${hexTimestamp}`);

		// Pass the modified request to the origin
		const response = await fetch(modifiedRequest);

		return response;
	},
};
```

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```json
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```