Analyze a Calendar Date

Want a full breakdown of any calendar date? The Analyze a Calendar Date tool gives you detailed insights for every date you enter including the day of the week, day of the year, week number, and whether it falls in a leap year. It’s ideal for data enrichment, event planning, or simply learning more about important dates.

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Supported file types: .txt, .csv, .log, .json, .md, .xml, .html
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How to Use:

  1. Enter one or more calendar dates in YYYY-MM-DD format, each on a separate line.
  2. Or import a file using the Choose File button to analyze a list of dates.
  3. The tool will instantly display the day of the week, the day number, the week number, and leap year status for each date.
  4. Use Copy Output or Export to File to save the results.
  5. Click Clear All to reset everything.

What Analyze a Calendar Date Tool can do:

This tool evaluates each date and returns a full summary: weekday name (e.g., Friday), day of year (1–365/366), ISO-style week number, and a leap year flag. It supports bulk processing with smart formatting for fast, readable results.

Example:

Input:

2024-12-25
2000-01-01
2025-05-18
1999-07-04

Output:

2024-12-25 → Wednesday, Day 360 of 2024, Week 52, Leap Year: true
2000-01-01 → Saturday, Day 1 of 2000, Week 1, Leap Year: true
2025-05-18 → Sunday, Day 138 of 2025, Week 21, Leap Year: false
1999-07-04 → Sunday, Day 185 of 1999, Week 27, Leap Year: false

Common Use Cases:

Perfect for teachers, data analysts, event managers, or developers who need contextual time metadata. Use it to tag events, structure reports, annotate logs, or check leap years quickly and easily.

Useful Tools & Suggestions:

If you’re diving into a specific day, Find Day of the Week gives quick insight into where it lands. And to dig deeper, Find Season by Date adds a nice touch of context for what part of the year you’re in.

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