Truncate a Calendar Date
Drop the day (or the day and month) to snap each date down to its month or year. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Truncate a Calendar Date
- 1. Paste your dates. Add one or more calendar dates to the input pane, one per line, such as 2026-07-14. Each line is truncated independently.
- 2. Choose what to truncate to. Select Month to drop the day and keep the 1st of that month, or Year to drop both the day and month and keep January 1st, from the Truncate to menu.
- 3. Copy the truncated dates. Click copy on the output pane to grab every truncated date. Switching the setting recalculates the whole list instantly.
When to use Truncate a Calendar Date
Truncate a Calendar Date drops the day, or the day and month, from each date you provide, snapping it down to the start of its month or year rather than rounding to the nearest one. Use it when you specifically need a floor operation, not a round.
- Grouping records by billing month. A billing system needs every transaction date collapsed to the first of its month for grouping in a monthly revenue report. Truncate to Month before pivoting the data.
- Building a yearly cohort analysis. A cohort analysis groups users by the year they signed up, regardless of the exact month or day. Truncate signup dates to Year to get clean cohort buckets.
- Normalizing dates for a monthly comparison. Two datasets record the same events with different day-of-month values. Truncate both to Month so they can be joined and compared on equal footing.
Examples
Truncate to the month
Input
2026-07-14
Output
2026-07-01
Truncate to the year
Input
2026-07-14
Output
2026-01-01
About the Truncate a Calendar Date tool
Truncate a Calendar Date is a free online tool that works entirely inside your web browser. Drop the day (or the day and month) to snap each date down to its month or year. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 90 Time utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with the Truncate to setting, and the result refreshes the moment you change it. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Truncate a Calendar Date free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.
Related tools
All Time Tools →Round a Calendar Date
Snap each date to the nearest start of month or start of year.
Increment a Calendar Date
Add a number of days, weeks, months or years to each calendar date.
Decrement a Calendar Date
Subtract a number of days, weeks, months or years from each calendar date.
Format a Calendar Date
Reformat each calendar date using tokens like YYYY, MM, DD, MMMM and dddd.