Date & Time
Leap Second Table — IERS DUT1, TAI-UTC Offset & Cross-System Time
IERS leap-second history (27 insertions since 1972), current TAI-UTC offset (+37 s), DUT1 (UT1-UTC) notes, and POSIX/NTP/GPS/TAI/UT1 cross-system conversion for a given UTC instant
html· HTML resultOpen tool
Quick start
Call this tool from your code in three languages.
cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/leap-second-table-iers-dut1-tai-utc-offset-diff' \
-H 'Content-Type: application/json' \
-d '{"mode":"table","utcInstant":"e.g. 2026-08-10T12:00:00Z (used in conversion mode)","dut1":0}'API reference
Send a POST request with your inputs as JSON. File parameters require a separate upload first.
Endpoint
HTTP
POST https://api.elysiatools.com/en/api/tools/leap-second-table-iers-dut1-tai-utc-offset-diffParameters
| Name | Type | Required | Description |
|---|---|---|---|
| mode | select | No | — |
| utcInstant | text | No | — |
| dut1 | number | No | — |
Response format
HTML result
JSON
{
"result": "<div>Processed HTML content</div>",
"error": "Error message (optional)",
"message": "Notification message (optional)",
"metadata": {
"key": "value"
}
}MCP integration
Add this tool to your Model Context Protocol server so AI agents can list and call it.
Server configuration
Add this block to your MCP client configuration:
mcp.json
{
"mcpServers": {
"elysiatools-leap-second-table-iers-dut1-tai-utc-offset-diff": {
"name": "leap-second-table-iers-dut1-tai-utc-offset-diff",
"description": "IERS leap-second history (27 insertions since 1972), current TAI-UTC offset (+37 s), DUT1 (UT1-UTC) notes, and POSIX/NTP/GPS/TAI/UT1 cross-system conversion for a given UTC instant",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=leap-second-table-iers-dut1-tai-utc-offset-diff",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}List available tools
After connecting to the SSE endpoint, list the exposed tools:
tools/list
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Call this tool
Invoke the tool by its id, passing arguments built from its parameters:
tools/call
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "leap-second-table-iers-dut1-tai-utc-offset-diff",
"arguments": {
"mode": "table",
"utcInstant": "e.g. 2026-08-10T12:00:00Z (used in conversion mode)",
"dut1": 0
}
}
}Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).
Questions or issues? Contact [email protected]