All Tools VerseTruncate Calendar Date
Truncate a calendar date down to the first day of its month or year.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Calculated locally in your browser. Nothing is uploaded.
How to Use Truncate Calendar Date
- Enter a date. In the YYYY-MM-DD format.
- Choose a unit. The first of the month or the first of the year.
- Truncate. The date is cut back to that start.
- Copy the result. Click Copy result. It all runs in your browser.
Frequently Asked Questions
How is this different from rounding?
Truncating always moves back to the start of the period, while rounding can move forward to the nearest boundary.
What do the units do?
Month gives the first day of that month, and year gives the first day of January for that year.
What is this useful for?
Grouping records by month or year, where every date in a period maps to a single start date.
Is anything uploaded?
No. The calculation runs entirely in your browser, so nothing leaves the tab.
Is it free?
Yes. Every tool here is free to use with no sign up.
Related Tools
Analyze Calendar Date →
Mathematically analyze calendar date completely. Extract structural leap statuses, ISO week formatting, and specific…
Calculate Average Calendar Date →
Calculate the average date from any list of calendar dates instantly in your browser.…
Decrement Calendar Date →
Subtract years, months, days from any date with correct month-end clamping (March 31 minus…
Date Format Converter →
Reformat a date into ISO, day-month-year, long, or full styles, in your browser.
Add Days to Date Online →
Add or subtract days, weeks, months, or years from a date, with month ends…
Round Calendar Date →
Round a calendar date to the nearest month or year, with up, down, or…
Spell a Date in Words →
Spell out a calendar date in plain English words, including the year.
Validate Calendar Date →
Check whether calendar dates are valid, with correct months and days, in ISO, US,…
Calculate Date at Percent of Year →
Calculate Date at Percent of Year - Find the calendar date corresponding to any…
Convert Date to Julian Day →
online date to Julian Day converter. Returns JD, JDN, MJD, and J2000 offset with…
Convert Gregorian Date to Julian Date →
Convert Gregorian calendar dates to Julian calendar dates with Julian Day Number, day-of-week, and…
Convert Julian Date to Gregorian Date →
Convert Julian Day Number, Julian Calendar date, or ordinal date (YYYY-DDD) to Gregorian. Free,…