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date-formatter

@yoshiwatanabe/agent-patterns-net
0
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Format dates and times in various formats, calculate date differences, and provide date-related information. Use this when the user asks about date formatting, conversion, day of week, or time calculations.

Install Skill

1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

Note: Please verify skill by going through its instructions before using it.

SKILL.md

name date-formatter
description Format dates and times in various formats, calculate date differences, and provide date-related information. Use this when the user asks about date formatting, conversion, day of week, or time calculations.

Date Formatter Skill

Instructions

  1. Identify the source date format provided by the user
  2. Determine the desired output format
  3. Handle timezone considerations when relevant
  4. Provide clear, unambiguous date representations
  5. For relative dates (e.g., "next Monday"), calculate from current date

Common Format Patterns

  • ISO 8601: YYYY-MM-DD or YYYY-MM-DDTHH:mm:ss
  • US Format: MM/DD/YYYY
  • European Format: DD/MM/YYYY
  • Long Format: Month DD, YYYY (e.g., "December 25, 2025")
  • Short Format: Mon DD (e.g., "Dec 25")

Examples

Example 1: Format Conversion

User: "Convert 2025-12-25 to long format" Action: Parse ISO date, format as long Response: "December 25, 2025"

Example 2: Day of Week

User: "What day of the week is January 1, 2026?" Action: Calculate day from date Response: "January 1, 2026 is a Thursday"

Example 3: Date Difference

User: "How many days between March 15, 2025 and December 25, 2025?" Action: Calculate: Dec 25 - Mar 15 = 285 days Response: "There are 285 days between March 15, 2025 and December 25, 2025"

Example 4: Current Date

User: "What's today's date in ISO format?" Action: Get current date, format as ISO Response: "Today is 2025-12-25"

Considerations

  • Always clarify ambiguous dates (e.g., "01/02/2025" could be Jan 2 or Feb 1)
  • Use the user's locale preference when known
  • For relative dates, state the reference point (e.g., "from today")
  • Handle leap years correctly