What Date Was 12 Months Ago?

Check the exact date 12 months ago

This is calculated from today’s date. Everything runs in your browser and follows your local time zone.

Date 12 Months Ago:

Loading…

—

Target Day Number: — of —

Target Week Number: — of —

—

How much time is twelve months?

Twelve months is effectively one full year. In calendar days this spans 365 or 366 days, depending on leap years. As a general guide:

  • Years 1 year
  • Days* 365–366 days
  • Hours* 8,760 hours (for a 365-day year)
  • Minutes* 525,600 minutes (365-day basis)
  • Seconds* 31,536,000 seconds (365-day basis)
*Exact totals depend on whether a leap day falls within your 12-month span. The calculator above always uses real calendar dates.

What is the date 12 months ago in numbers?

MM-DD-YYYY—
DD-MM-YYYY—
YYYY-MM-DD—
MM/DD/YYYY—
DD/MM/YYYY—

For systems and international teams, YYYY-MM-DD (ISO 8601) is the safest format.

“12 months ago” — quick FAQ

Which time zone is used?

The result uses your device’s current time zone and updates automatically at your local midnight, so “12 months ago” always reflects your local calendar.

Is 12 months ago always the same as 365 days ago?

Not always. This tool moves back exactly one calendar year from today’s date (12 months), so it correctly accounts for leap years and real month lengths. Depending on the year, that span can cover 365 or 366 days.

Are weekends and holidays included?

Yes — we use calendar dates only. If you need to count only working days between today and that date, use the Date Difference Calculator.

Can I copy the result?

Use the buttons under the headline to copy the long-form date or the ISO 8601 format instantly into your systems.

When would I check what date was 12 months ago?

Typical use cases include subscription or license lookbacks, lease and rental history, tax and accounting periods, warranty eligibility, audits, and policy rules that say “within the last 12 months.”

How we calculate “12 months ago” (and why it’s accurate)

This page is built to answer one precise question: what exact calendar date was 12 months before today? Instead of guessing “about a year” or counting boxes across the calendar, the tool subtracts a full year from your local today-date and shows the result in a bold, human-readable format like Monday, November 7, 2024 (example only). Right below, you’ll see the ISO version plus the target day-of-year and ISO week number for clean documentation.

True calendar logic. We don’t hard-code 365 days. The script moves back exactly 12 months from your current local date, letting JavaScript’s date engine handle different month lengths and leap years. That means special cases—like dates around February 29—are resolved in a consistent, standards-aligned way.

Perfect for 12-month rules. Many real-world rules reference a rolling 12-month window: eligibility checks, background and KYC reviews, employment history, benefit qualification, recurring invoices, price-lock clauses, and warranty or return terms. This page gives you a single authoritative date you can drop straight into forms and reports.

Helpful time equivalents. Because “12 months” is effectively one year, the conversions box shows how that maps to days, hours, minutes, and seconds on a standard 365-day basis, and reminds you when leap years can shift the exact totals. For precise spans between any two dates, you can always confirm using the Date Difference Calculator.

Clear numeric formats. To avoid confusion between regional formats, we output multiple numeric views of the same date — including MM-DD-YYYY, DD-MM-YYYY, and the recommended YYYY-MM-DD ISO style — so you can copy exactly what your software, contract, or filing system expects.

Private by design. All calculations run entirely in your browser. No dates or personal details are sent to our servers. If anything looks off, quickly confirm that your device’s date, time, and time zone are set correctly, then refresh.