Convert Julian Calendar to Gregorian Calendar

Working with historical data or old calendar formats? The Convert Julian Calendar to Gregorian Calendar Tool helps you accurately convert dates from the Julian into their Gregorian equivalents. Whether you’re studying timelines, documenting religious dates, or dealing with archived records, this tool offers fast and accurate conversion.

You can enter multiple dates, upload a file, and export the results with ease.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .log
Total dates: 0

How to Use:

  1. Enter one Julian date per line using the YYYY-MM-DD format into the Input Julian Dates box.
  2. Or click Choose File to import a .txt, .csv, or .log file.
  3. The Gregorian Calendar Dates output updates instantly.
  4. Click Copy Output to copy the results or Export to File to download them.
  5. Use Clear All to reset the input and output boxes.

What Julian to Gregorian Calendar Tool can do:

  • Converts valid Julian dates into Gregorian equivalents based on historical shift logic:
    • 10 to 14 day shift depending on the century
  • Supports multiple entries
  • Flags invalid date formats clearly
  • Live output with result count and copy/export buttons
  • Demo output loads automatically on page load

Example:

Input:

2024-02-17
1999-12-19
1582-10-05
1900-12-18
2023-10-23

Output:

2024-02-17 → 2024-03-01
1999-12-19 → 2000-01-01
1582-10-05 → 1582-10-15
1900-12-18 → 1900-12-31
2023-10-23 → 2023-11-05

Julian to Gregorian Calendar Conversion Table:

This table shows how selected Julian calendar dates convert to their corresponding Gregorian calendar equivalents. It’s useful for historians, researchers, or anyone comparing historical and modern date systems.

Julian DateGregorian DateExample Use
1582-10-041582-10-14Last Julian day before Gregorian reform
1600-03-011600-03-11Leap year comparison
1700-01-011700-01-12Early 18th-century date
1752-09-021752-09-13UK switch to Gregorian
1800-06-151800-06-27Historical research
1900-01-011900-01-13Turn of century
1918-02-011918-02-14Russia adopts Gregorian
1950-12-251951-01-07Eastern Orthodox Christmas
2000-01-012000-01-14Modern example
2024-04-012024-04-14Recent conversion

Common Use Cases:

This tool is ideal for researchers, historians, educators, or developers working with date systems prior to the adoption of the Gregorian calendar. It saves time and removes the complexity of manual date conversion, while ensuring accuracy across different historical timeframes.

Useful Tools & Suggestions:

If you’re working backward, Convert Gregorian Calendar to Julian Calendar switches it the other way. And once your date’s aligned, Convert a Date to a Julian Day gives you a clean number to work with.

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