Claude Conversation Timestamps Script for the tampermonkey.com extension to a web browser
Ver 2.5 | 2025-08-14
By baseline Claude Sonnet 4 with tweaks by baseline ChatGPT-5 and Wayne L. "Grasshopper" Pendley
Here's how to find and install this script.
1. Install the Tampermonkey Extension
- Go to your browser's extension/add-on store.
- Search for Tampermonkey and install it (available for Chrome, Edge, Firefox, Opera, and Safari).
- After installation, you'll see the Tampermonkey logo (usually a black square with two white dots) in your browser's extension bar.
2. Locate this particular script in the repository on greasyfork.org:
- Open the Tampermonkey dashboard
- Go to the "Browse" or "Get new scripts" section
- Search for "Displays Date & Times within Anthropic Claude Conversations"
- Confirm the script authors include "Wayne L. 'Grasshopper' Pendley"
- When confirmed, install it to your dashboard and make sure the switch is set to "Enabled".
What the script does:
- Adds permanent timestamps to every message in Claude conversations
- Formats timestamps as UTC Coordinated Universal Time, e.g., "2025-08-14 16:40:43"
- No hovering required - timestamps are always visible
- Uses a readable 15px font size
- Works automatically as you chat
Key benefits:
- Track conversation timing for reference
- See exactly when messages were sent/received
- Timestamps become part of your chat history
- Clean integration that looks native to Claude's interface
This addresses a real gap since Claude doesn't show message timestamps by default.
History
Originally authored by Claude Sonnet 4, then enhanced by ChatGPT-5 who hardened fetch handling, expanded React prop key checks, added JSON size guards, prevented overlapping runs, cleaned CSS, built in XHR interception, and wrapped DOM-change triggers in a 250 ms debounce for smoother performance. ChatGPT-5 also handled Grasshopper's iterative tweak requests, including making the year display constant, increasing the font size for aged eyes, and changing the font color levels for just a bit more contrast without visual noise.
v2.4 changed the timestamp's font size to 15px.
v2.5 fixed errors in AM/PM assignment by switching to Universal Time Codes
