Meridian No account · runs in your browser

Time zones, without the math

What time is it for everyone?

Add the places people are. Drag one slider. See who is awake, and get the best meeting times. Daylight saving is handled for the exact date.

    Try one
    Working hours
    The trap

    The gap is not always the same.

    The US and Europe change clocks on different weeks, so New York and London are 4 hours apart for a few weeks, not 5. Meridian uses the real rules for the date you pick.

    The fix

    Pick the time that hurts least.

    Best times ranks start times so the most people are in working hours and nobody is up at night, and says so plainly when nothing works for everyone.

    Private

    Nothing leaves your device.

    The places and times you pick stay in your browser. There is no account.

    Use Meridian with your AI

    Add Meridian to ChatGPT, Claude, Cursor or any assistant that supports MCP, then ask it to get the real current time anywhere, convert times between time zones and find meeting times across zones. No key, no login.

    https://meridian.clawhard.com/mcp
    Add to CursorAdd to VS CodeAdd to Claude
    More ways to connect

    Claude Code

    claude mcp add --transport http clawhard-meridian https://meridian.clawhard.com/mcp

    Codex

    codex mcp add clawhard-meridian --url https://meridian.clawhard.com/mcp

    Gemini CLI

    gemini mcp add --transport http clawhard-meridian https://meridian.clawhard.com/mcp

    Cursor, Windsurf and others (mcp.json)

    {
  "mcpServers": {
    "clawhard-meridian": { "url": "https://meridian.clawhard.com/mcp" }
  }
}

    ChatGPT

    Open Plugins → Add → Add custom MCP server, paste the URL above, choose No authentication, then create it.

    Other apps: Goose · LM Studio. Any MCP client works with the URL (Streamable HTTP, no headers).

    OpenAPI (custom GPT Actions, scripts) · llms.txt · MCP server card · Agent card · All Clawhard tools in one connector

    Common questions

    Meridian converts times between time zones, shows who is awake, and finds meeting times that work across places, with daylight saving handled correctly for the exact date. Runs in your browser, no account.

    How do I convert a time between time zones?

    Add the places in Meridian, set the date, and drag the slider to the time in the first place. Every row shows the local time and date. It uses the real daylight saving rules for that date.

    Why is the difference between New York and London not always 5 hours?

    The US and the UK change clocks on different dates. For about one to three weeks in March and one week in autumn the gap is 4 hours instead of 5. Meridian uses the actual rules for the date you pick.

    What happens to a time that does not exist during daylight saving?

    When clocks jump forward (for example 2:30 AM on the US spring-forward day) that time does not exist. Meridian says so and uses the next valid time. When clocks go back, a time can happen twice and Meridian uses the first.

    How does Meridian find a good meeting time?

    It scans the day in 15-minute steps and ranks start times by how many people are inside working hours and by avoiding night for anyone. If no time works for everyone it shows the least bad options and says so.

    Is IST India, Ireland or Israel?

    The abbreviation is ambiguous. Meridian reads IST as India Standard Time (Asia/Kolkata) and tells you. Use a city or an IANA zone like Europe/Dublin to be exact.

    Can an AI assistant use Meridian?

    Yes. Add the MCP server https://meridian.clawhard.com/mcp (tools meridian_now, meridian_convert_time, meridian_meeting_slots, meridian_zone_info) or call the JSON API described at /openapi.json. It gives assistants the real current time and correct conversions.

    For AI assistants and developers: llms.txt · API (OpenAPI) · MCP server · sitemap