TOOLOG TOOL
Date Format Normalizer | Standardize dates in docs, notes, and announcements
Use Date Format Normalizer to convert mixed yyyy-mm-dd, yyyy년 m월 d일, May 4, 2026, 20260504, and 05/10/2026 date styles into one format, with ambiguous month/day dates flagged for review.
Paste mixed date text to normalize it into one format.
Ambiguous slash dates such as 05/10/2026 are counted separately so you can review them before sharing.
Why use Date Format Normalizer?
When you clean up documents, announcements, meeting notes, or spreadsheet drafts, inconsistent date notation is a small issue that quickly makes the whole file feel unfinished.
2026.5.42026년 5월 4일May 4, 202620260504
Date Format Normalizer reads these common date expressions and converts them into one consistent output style. It can also find dates inside full sentences and flags slash dates such as 05/10/2026 when the order could be month/day or day/month.
How to use it
- Paste date-only lines or text that contains dates.
- Choose an output format:
2026-05-04,2026. 5. 4.,2026/05/04, or a localized weekday format. - Set the slash-date interpretation rule if your text includes dates such as
05/10/2026. - Copy the normalized result into announcements, docs, Notion pages, spreadsheets, or shared notes.
Supported input examples
- Numeric dates:
2026-05-04,2026.5.4,20260504 - Korean date text:
2026년 5월 4일 - English month dates:
May 4, 2026,4 May 2026 - Slash dates:
05/10/2026, with the parsing rule shown in the result summary
Good use cases
1. Polishing announcements or operating docs
When multiple people have edited the same document, this helps standardize date styles before publishing.
2. Cleaning up Excel, memo, or email text
You can convert one-date-per-line lists or turn on inline extraction to normalize dates inside sentences.
3. Mixing English month names with Korean or ISO-style dates
English month dates such as May 4, 2026 can be converted into a Korean-style weekday format or a clean ISO date.
FAQ
Why are some slash dates marked for review?
Dates such as 05/10/2026 can reasonably be read as either month/day or day/month depending on the source, so the tool counts them separately for manual review.
What happens to invalid dates?
Impossible dates such as 2026-02-30 are not converted. You can keep unparsed lines in the output or omit them.
What does the empty-state message mean?
If the tool says no recognizable date was found, try a supported pattern such as yyyy-mm-dd, May 4, 2026, 4 May 2026, or 20260504.
Does it convert times too?
No. This tool focuses on date formatting. Use a timezone or time calculator when the time of day matters.
Related tools
Summary
Date Format Normalizer is a converter-type tool for standardizing mixed date expressions in documents, announcements, memos, and spreadsheet drafts while keeping ambiguous slash dates visible for review.