Freeform Date Calculator

Trying to calculate dates like “2024-01-01 + 90 days” or “03/15/2023 – 2 weeks” without switching to a calendar app? The Freeform Date Calculator Tool lets you plug in flexible, human-style date math and instantly returns the correct results. You can even batch-process multiple expressions in one go.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .log
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Options
Pad with zeroes
Skip invalid lines

How to Use:

  1. In the Date Expressions box, enter one line per expression like 2024-01-01 + 5 days or 03/15/2023 - 2 weeks.
  2. You can also use the Choose File button to upload a .txt, .csv, or .log file.
  3. In the Options box, choose how the output dates should appear:
    • YYYY-MM-DD (ISO format)
    • MM/DD/YYYY (US format)
    • YYYYMMDD (compact format)
  4. Enable Pad with zeroes if you want consistent digit width in the output.
  5. Turn on Skip invalid lines to ignore expressions that don’t match the supported formats.
  6. The Calculated Output updates instantly as you type or change any settings.
  7. Click Copy Output or Export to File to save your results.
  8. Use Clear All to reset everything and start fresh.

What Freeform Date Calculator Tool Can Do:

This tool understands natural expressions that combine a starting date and a time offset, like + 3 days, – 2 weeks, or + 1 month. It can parse both YYYY-MM-DD and MM/DD/YYYY input styles. After calculating the result, it reformats the output to your chosen style, pads the numbers if needed, and optionally skips bad lines.

Example:

Input:

2024-01-01 + 5 days
03/15/2023 - 2 weeks
2022-06-10 + 90 days

Output (default format: YYYY-MM-DD):

2024-01-06
2023-03-01
2022-09-08

Common Use Cases:

Use this when processing logs, planning timelines, adjusting deadlines, or checking relative dates in spreadsheets. It’s especially useful for project managers, developers, and researchers who need to work with dynamic date math in bulk. Instead of doing it manually or with formulas, drop your expressions here and let the tool do the work.

Useful Tools & Suggestions:

If your date inputs are a bit messy, Normalize Unicode Text can help clean things up before calculation. And for anything encoded strangely, Convert Unicode to UTF-8 can get the text into a more predictable format.

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