How do I install the Timestamp Standard skill?

Run npx skillmds@latest add majiayu000/timestamp-standard in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Timestamp Standard safe to use?

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Which AI agents work with Timestamp Standard?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Timestamp Standard free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Timestamp Standard?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Timestamp Standard by majiayu000 — Agent Skill

Name: Timestamp Standard
Rating: 4.2 (5 reviews)
Author: majiayu000

File contents

Time Representation Standard

Time Point (Instant)

Type	Format	Description
Time Point	number	Millisecond timestamp, UTC-based, timezone-independent

Core Principles:

All time points use millisecond timestamps (Unix Epoch Milliseconds)
Timestamps are timezone-independent, frontend converts display based on user timezone
Database storage, API transmission, frontend-backend interaction all use numeric type

Duration

Type	Format	Example	Description
Duration	string	`PT1H30M`	ISO 8601 duration format

Duration Format: PT[n]H[n]M[n]S

PT1H - 1 hour
PT30M - 30 minutes
PT1H30M - 1 hour 30 minutes
PT45S - 45 seconds
PT1H30M45S - 1 hour 30 minutes 45 seconds

Period

Type	Format	Example	Description
Period	string	`P1Y2M3D`	ISO 8601 date period format

Period Format: P[n]Y[n]M[n]D

P1Y - 1 year
P2M - 2 months
P3D - 3 days
P1Y2M3D - 1 year 2 months 3 days

Usage Examples

Interface Definition

interface Event {
  createdAt: number    // 1732608000000
  updatedAt: number    // 1732694400000
  duration: string     // "PT2H30M"
  validPeriod: string  // "P1Y"
}

Frontend Conversion

// timestamp to local display
const display = new Date(timestamp).toLocaleString()

// local time to timestamp
const timestamp = new Date().getTime()

Backend Processing (Kotlin/Java)

// Instant and timestamp conversion
val instant = Instant.ofEpochMilli(timestamp)
val timestamp = instant.toEpochMilli()

// Duration parsing
val duration = Duration.parse("PT1H30M")

// Period parsing
val period = Period.parse("P1Y2M")

Design Philosophy

Timestamps: Numeric type for efficient transmission, no timezone ambiguity, cross-language compatible
Duration/Period: ISO 8601 standard format, clear semantics, native parsing support

---name: timestamp-standarddescription: Frontend-backend time data transmission standard, using millisecond timestamps for time points (timezone-independent); Duration/Period use ISO 8601 string format.--- ## Time Representation Standard ### Time Point (Instant) | Type | Format | Description | |------|--------|-------------| | Time Point | number | Millisecond timestamp, UTC-based, timezone-independent | **Core Principles**: - All time points use **millisecond timestamps** (Unix Epoch Milliseconds) - Timestamps are timezone-independent, frontend converts display based on user timezone - Database storage, API transmission, frontend-backend interaction all use numeric type ### Duration | Type | Format | Example | Description | |------|--------|---------|-------------| | Duration | string | `PT1H30M` | ISO 8601 duration format | **Duration Format**: `PT[n]H[n]M[n]S` - `PT1H` - 1 hour - `PT30M` - 30 minutes - `PT1H30M` - 1 hour 30 minutes - `PT45S` - 45 seconds - `PT1H30M45S` - 1 hour 30 minutes 45 seconds ### Period | Type | Format | Example | Description | |------|--------|---------|-------------| | Period | string | `P1Y2M3D` | ISO 8601 date period format | **Period Format**: `P[n]Y[n]M[n]D` - `P1Y` - 1 year - `P2M` - 2 months - `P3D` - 3 days - `P1Y2M3D` - 1 year 2 months 3 days ## Usage Examples ### Interface Definition ```typescript interface Event { createdAt: number // 1732608000000 updatedAt: number // 1732694400000 duration: string // "PT2H30M" validPeriod: string // "P1Y" } ``` ### Frontend Conversion ```typescript // timestamp to local display const display = new Date(timestamp).toLocaleString() // local time to timestamp const timestamp = new Date().getTime() ``` ### Backend Processing (Kotlin/Java) ```kotlin // Instant and timestamp conversion val instant = Instant.ofEpochMilli(timestamp) val timestamp = instant.toEpochMilli() // Duration parsing val duration = Duration.parse("PT1H30M") // Period parsing val period = Period.parse("P1Y2M") ``` ## Design Philosophy - **Timestamps**: Numeric type for efficient transmission, no timezone ambiguity, cross-language compatible - **Duration/Period**: ISO 8601 standard format, clear semantics, native parsing support

Frequently asked questions

Timestamp Standard