Normalize Calendar Dates

If you’re stuck with inconsistent or broken date entries, the Normalize Calendar Dates Tool is here to help. It checks for errors, reformats each entry, and instantly cleans up problematic dates like 2/29/2023 or 2024-13-35. With a few simple settings, you can quickly get everything aligned to a clean, reliable format.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .log
Total items: 0
Options
Pad with zeroes
Skip invalid entries

How to Use:

  1. Enter one date per line into the Input Dates box. Formats like YYYY-MM-DD or MM/DD/YYYY are both accepted.
  2. Or, click Choose File to import from a .txt, .csv, or .log file.
  3. Use the Options box to control the formatting:
    • Choose between ISO (YYYY-MM-DD), US-style (MM/DD/YYYY), or compact (YYYYMMDD) output.
    • Toggle Pad with zeroes to format dates like 03/09/2022 instead of 3/9/2022.
    • Use Skip invalid entries to remove any lines that can’t be parsed into a valid calendar date.
  4. The Normalized Output will update live as you type or change settings.
  5. Click Copy Output or Export to File to save the results.
  6. Press Clear All to reset the tool to its default state.

What Normalize Calendar Dates Tool Can Do:

This tool does more than just format text it actually validates each date. For example, it catches problems like February 30th or months with too many days. You can decide whether to keep or discard invalid entries. Then, based on your format choice, it standardizes the result and adds zero-padding if needed. Everything updates instantly, so you’re always seeing the latest changes.

Example:

Input:

2/29/2023
1999-2-3
2024-13-35
12/32/2022

Output (default settings):

1999-02-03

Common Use Cases:

Whether you’re prepping data for import into a system, fixing user-submitted forms, or scrubbing bad exports from a database, this tool saves time by validating and reformatting dates for you. Use it for cleanup tasks, standardizing formats across systems, or ensuring your calendar data is reliable and ready to go.

Useful Tools & Suggestions:

If you’re standardizing date strings, Remove Combining Characters can help clear out invisible marks that throw things off. And if you need to confirm character-by-character details, Convert Unicode to UTF-8 shows exactly how each part is encoded.

Related Tools