Claude-skill-registry date-formatter

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

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/date-formatter" ~/.claude/skills/majiayu000-claude-skill-registry-date-formatter && rm -rf "$T"

manifest: skills/data/date-formatter/SKILL.md

Date Formatter Skill

Instructions

Identify the source date format provided by the user
Determine the desired output format
Handle timezone considerations when relevant
Provide clear, unambiguous date representations
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