Timezone Truth
https://timezone-truth.gumballtools.com/api/mcp ↗
Description
Convert times between IANA zones and detect skipped or ambiguous DST local times.
What our measurements say
Timezone Truth is a remote MCP server published at timezone-truth.gumballtools.com. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 2,069 ms, a delay an agent will notice. It offers a narrow, focused set of 1 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool name 'convert_time' clearly indicates its purpose of time conversion.
- Description explains the importance of using the tool over manual calculations.
Weaknesses
- Description is cut off mid-sentence, leaving critical information about DST ambiguities incomplete.
- Parameter types are all generic 'string' without specifying required formats (e.g., datetime format for 'time').
- No explicit documentation of error handling or constraints for invalid inputs.
convert_time— Description truncated mid-sentence, missing key DST handling detailsconvert_time— Parameter 'time' lacks format specification (e.g., ISO 8601 format)convert_time— Optional 'prefer' parameter has no documented allowed values
Verdict
Event narrative
Sign up free to generateSchema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 173ms → warm 175ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
convert_timeConvert a wall-clock time between two IANA timezones, and report the ways the conversion can be wrong. ALWAYS use this instead of doing the arithmetic. Timezone conversion looks like addition and is not: the mapping from a local time to an instant is not a function. - On the spring-forward date, an hour of local time DOES NOT EXIST. Asked to convert 02:30 on that date, a model will return a plausible timestamp for a time that never happens. This tool returns null and says why. - On the fall-back date, an hour happens TWICE. There are two correct answers an hour apart; this returns both rather than silently choosing. - The gap between two zones is not constant. Zones start and end daylight saving on different dates, so a cached offset is wrong for weeks each year. - Not all offsets are wh
timestringrequiredfromstringrequiredtostringrequiredpreferstring
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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[](https://mcpmetrics.io/servers/com-gumballtools-timezone-truth)<a href="https://mcpmetrics.io/servers/com-gumballtools-timezone-truth"><img src="https://mcpmetrics.io/badge/com.gumballtools/timezone-truth/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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