Weeks Ago Calculator
Find the exact date for any number of weeks in the past, from 1 week ago to 52 weeks (one full year) ago. Each week is exactly 7 days, so results are always precise across month and year boundaries. Useful for sprint reviews, payroll cycles, billing periods, and annual comparisons.
Browse Weeks
Most Popular Weeks Ago Lookups
Click any row to open the full calculator.
| Time Period | Common Use Case |
|---|---|
| 1 week ago | Last week's date: weekly report baseline and Monday anchoring |
| 2 weeks ago | One sprint ago in a 2-week agile cycle |
| 4 weeks ago | One bi-monthly billing cycle and 28-day lookback |
| 6 weeks ago | Six-week sprint or extended trial period |
| 8 weeks ago | Two-month approximate and four-sprint lookback |
| 12 weeks ago | One quarter approximate (84 days) for project reviews |
| 26 weeks ago | Six-month half-year milestone and mid-year review |
| 52 weeks ago | Year-over-year comparison (364 days: 1 day before a full year) |
Who Uses the Weeks Ago Calculator?
Sprint retrospectives run on exact weekly cycles, typically 1, 2, or 3 weeks. Use this calculator to find the start date of any past sprint. Quick links: 1 week ago, 2 weeks ago.
Weekly and bi-weekly payroll periods, four-week billing cycles, and 13-week fiscal quarters are all week-based. For calendar-month-based billing, see the Months Ago calculator.
Campaign performance is often compared week-over-week. Knowing the exact date range for any past week lets you pull the right data slice from your analytics platform without guessing.
Training programs, nutrition plans, and medical follow-ups run on weekly schedules. Find when a 4-week program started, or when a 12-week treatment course began.
How the Weeks Ago Calculator Works
Each week is treated as exactly 7 days. The calculator multiplies the week count by 7 and subtracts the result from today's date in UTC. Because weeks are always 7 days, there is no ambiguity around month lengths or DST. The result is always the same day of the week as today, a precise number of weeks in the past.
Choose any increment above to open the full calculator. On the detail page you can switch time zones, copy the result, and see the equivalent UTC timestamp alongside your local time.
Weeks vs. Months: Why Weeks Are More Precise
A "month" is between 28 and 31 days. A "week" is always exactly 7 days. For recurring schedules on a fixed weekday, counting in weeks gives the exact calendar date every time. For contract periods that follow the calendar (a lease from the 1st to the last day of a month), use the Months Ago calculator instead.
- ▸ 1 week: exactly 7 days, always the same day of the week
- ▸ 4 weeks: 28 days (not the same as 1 month)
- ▸ 13 weeks: approximately 1 quarter (91 days vs. 90-92 actual calendar days)
- ▸ 52 weeks: 364 days (a full calendar year is 365 or 366 days)