Epoch Calculator

by epochcalc.com · remote · no sign-in to list tools · v1.0.0 · published by com.epochcalc

Unix timestamps, DST-aware time zone conversion, durations, cron schedules, and holiday countdowns

Changes · 8

Compare Registry entry

8 tools: 8 change things.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things8Claude Code: ask: see these tools
Only reads0Claude Code: allow

4 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http epochcalc https://epochcalc.com/mcp

Findings

Matches of fixed checks, with the text they matched.

4 warn

Warnconvert_timestamp
The server marks "convert_timestamp" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "convert_timestamp" says "convert": a word for a change.
What this check looks for
Warnconvert_timezone
The server marks "convert_timezone" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "convert_timezone" says "convert": a word for a change.
What this check looks for
Warnepoch_math
The server marks "epoch_math" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The description's first verb is "add": a word for a change.
What this check looks for
Warncron_next_runs
The server marks "cron_next_runs" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The name "cron_next_runs" says "run": a word for a change.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

8 tools

Changes things 8Creates or changes something that can be changed back.Claude Code: ask

convert_timestampConvert a Unix timestamp (seconds or milliseconds; auto-detected unless unit is given) to a human-readable date in a time zone, with ISO 8601, RFC 2822, UTC offset, DST flag, weekd…1 finding
Why it is in this group
- The name "convert_timestamp" says "convert": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "convert_timestamp" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "convert_timestamp" says "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Convert a Unix timestamp (seconds or milliseconds; auto-detected unless unit is given) to a human-readable date in a time zone, with ISO 8601, RFC 2822, UTC offset, DST flag, weekday, and a relative phrase like "3 days ago".
Annotations the server declares
- title: Convert Unix timestamp
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
convert_timezoneConvert a wall-clock date/time from one IANA time zone to another, correctly across daylight-saving transitions.1 finding
Why it is in this group
- The name "convert_timezone" says "convert": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "convert_timezone" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "convert_timezone" says "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Convert a wall-clock date/time from one IANA time zone to another, correctly across daylight-saving transitions. Returns both sides with offsets, the hour difference at that instant, and whether either zone is on DST.
Annotations the server declares
- title: Convert between time zones
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
cron_next_runsExplain a 5- or 6-field cron expression in plain English and list its next run times in a time zone (as ISO 8601 and Unix timestamps).1 finding
Why it is in this group
- The name "cron_next_runs" says "run": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "cron_next_runs" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The name "cron_next_runs" says "run": a word for a change.
  What this check looks for
Description, as the server wrote it
Explain a 5- or 6-field cron expression in plain English and list its next run times in a time zone (as ISO 8601 and Unix timestamps). Use to answer "when does this cron job run next?" or to validate an expression.
Annotations the server declares
- title: Next cron runs
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
date_durationThe exact duration between two dates or date-times: calendar years/months/days, plus total days, hours, minutes and seconds, and the number of weekdays (Mon-Fri).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
The exact duration between two dates or date-times: calendar years/months/days, plus total days, hours, minutes and seconds, and the number of weekdays (Mon-Fri). Handles leap years and DST via the IANA database.
Annotations the server declares
- title: Duration between dates
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
days_untilCountdown to a holiday or to a date: days, hours and minutes remaining, and the next occurrence date.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Countdown to a holiday or to a date: days, hours and minutes remaining, and the next occurrence date. Pass an event slug (e.g. "christmas", "thanksgiving", "easter", "super-bowl") or a date (YYYY-MM-DD). Call with no arguments to list the known events.
Annotations the server declares
- title: Days until an event
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
epoch_mathAdd to or subtract from a Unix timestamp in calendar-aware units (years, months, weeks, days, hours, minutes, seconds) in a time zone, e.g.1 finding
Why it is in this group
- The description's first verb is "add": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "epoch_math" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The description's first verb is "add": a word for a change.
  What this check looks for
Description, as the server wrote it
Add to or subtract from a Unix timestamp in calendar-aware units (years, months, weeks, days, hours, minutes, seconds) in a time zone, e.g. "now + 30 days" or "1748736543 - 3 months". Returns the resulting timestamp in every format.
Annotations the server declares
- title: Epoch arithmetic
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false
parse_datetimeParse a date/time string (ISO 8601, RFC 2822, HTTP date, SQL "YYYY-MM-DD HH:mm:ss", or a Unix timestamp) into a Unix timestamp and a normalized description.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Parse a date/time string (ISO 8601, RFC 2822, HTTP date, SQL "YYYY-MM-DD HH:mm:ss", or a Unix timestamp) into a Unix timestamp and a normalized description. Strings without an offset are interpreted in the given time zone.
Annotations the server declares
- title: Parse date/time
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
time_nowThe current time: Unix epoch in seconds and milliseconds, ISO 8601, and the local wall-clock time in a given IANA time zone with its current UTC offset and DST status.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
The current time: Unix epoch in seconds and milliseconds, ISO 8601, and the local wall-clock time in a given IANA time zone with its current UTC offset and DST status. Use this before any relative date reasoning.
Annotations the server declares
- title: Current time
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: false
- openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http epochcalc https://epochcalc.com/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__epochcalc__time_now",
      "mcp__epochcalc__convert_timestamp",
      "mcp__epochcalc__parse_datetime",
      "mcp__epochcalc__convert_timezone",
      "mcp__epochcalc__date_duration",
      "mcp__epochcalc__epoch_math",
      "mcp__epochcalc__cron_next_runs",
      "mcp__epochcalc__days_until"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as epochcalc. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.epochcalc/epochcalc/changes.xml

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Source: MCP Registry. Synced Oct 21, 2026, 17:54 UTC.

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