30 Business Days Ago
30 business days ago (October 14, 2026) is:
Monday, August 31, 2026
That is 44 calendar days, skipping 12 weekend days and 2 US federal holidays.
Based on US federal holidays. Use the calculator below to change country.
Step back 30 business days from today, skipping weekends and US federal holidays, and you get the date above. The useful version of this question is usually about the start of a period that has already run: when a notice arrived, when goods were delivered, whether an event still sat inside a window that has since closed. The result card adjusts to your local calendar once the page loads, and the calculator below lets you replace today with whatever fixed date you are working back from.
Thirty business days back is six work weeks, and the question that usually brings people here is a retrospective one: on a particular date, was this invoice already late? Federal payment law answers it with a specific chain of dates, and none of them is the date printed on the invoice. To plan a payment forward instead, use the Net 30 calculator.
Reconstructing when a federal invoice actually fell due
The Prompt Payment rules build the due date out of three separate determinations. First, receipt: under 5 CFR 1315.4(b)(1)(ii) an invoice is deemed received on the later of actual receipt by the designated agency office or the seventh day after delivery or completion, unless acceptance happened earlier or the contract sets a longer acceptance period. Second, the period: under 1315.4(g)(1)(iv) payment is due thirty days after the start of the payment period where the contract is silent and no discount or accelerated method applies. Third, the landing: 1315.4(h) allows a payment falling due on a weekend or federal holiday to be made the following business day without triggering interest.
Interest then runs on a backward computation of its own. Under 5 CFR 1315.10(a)(1) it is calculated "from the day after the payment due date through the payment date" at the rate in effect on the day after the due date, and under (a)(5)(ii) it does not accrue for more than one year. So working out what was owed on a past date means fixing the constructive receipt date first, then the due date, then counting from the day after it.
Net 30 and thirty business days are not the same term
This is the most common mistake in the whole of invoice arithmetic and it is worth being blunt about. Net 30 means thirty calendar days. The thirty-day federal period above is also calendar days. Thirty business days reaches back roughly six weeks, which is about two weeks further than a Net 30 term covers.
If you are reconstructing an ageing report and the term was Net 30, this page will put the invoice date too early. It is the right tool when a contract genuinely says business days or working days, which some service agreements and government-adjacent contracts do.
Six work weeks of lookback, measured
| What was counted | Figure |
|---|---|
| Total span in calendar days | 44 days |
| Working weeks behind us | 6 weeks |
| Elapsed weeks on the wall calendar | 6.3 weeks |
| Roughly how many months back | 1.4 months |
| Weekend days inside the lookback | 12 |
| Public holidays inside the lookback | 2 |
| Weekday of the earlier date | Monday |
A retrospective payment check, in order
The sequence matters more than the arithmetic, because getting the start date wrong moves everything downstream.
- Establish constructive receipt, not the invoice date. Under 1315.4(b)(1)(ii) that can be a week after delivery.
- Apply the contract's own payment period if it has one; the thirty-day default only fills a gap.
- Check whether the due date landed on a weekend or federal holiday, which 1315.4(h) allows to roll without penalty.
- Count interest from the day after the due date, not from the due date itself, per 1315.10(a)(1).
- Remember the agency may not pay early either: 1315.4(j) bars payment more than seven days before the due date absent a specific determination.
Federal holidays inside these six work weeks
| Public holiday | Fell on | Day of week |
|---|---|---|
| Columbus Day | October 12, 2026 | Monday |
| Labor Day | September 7, 2026 | Monday |
Thirty business days back across other calendars
Six work weeks recounted against seven other national calendars. Countries with dense holiday calendars reach noticeably further back for the same count.
| National calendar | Points back to | Holidays in the span | Against the US date |
|---|---|---|---|
| United Kingdom | September 2, 2026 | 0 | 2 days more recent |
| Canada | August 28, 2026 | 3 | 3 days further back |
| Germany | September 2, 2026 | 0 | 2 days more recent |
| Spain | September 1, 2026 | 1 | 1 day more recent |
| India | September 1, 2026 | 1 | 1 day more recent |
| Japan | August 27, 2026 | 4 | 4 days further back |
| Mexico | September 1, 2026 | 1 | 1 day more recent |
What this page is built on
Read and confirmed on September 7, 2026. Several periods below run in calendar days even though the page counts in working days, and each one says so where it appears rather than in a footnote.
- 5 CFR 1315.4(b)(1)(ii), (g)(1)(iv), (h), (j) (opens in a new tab) (Office of the Federal Register (eCFR))
- 5 CFR 1315.10(a)(1), (a)(5)(ii) (opens in a new tab) (Office of the Federal Register (eCFR))
- 5 CFR 1315.4(g), (h) (opens in a new tab) (Office of the Federal Register (eCFR))
- Federal holidays (opens in a new tab) (U.S. Office of Personnel Management)
The same count, running the other way
If you need to set a deadline rather than reconstruct one, the sister page counts 30 business days forward from today. 30 business days from today.
Lookbacks of a similar length
All measured back from the reference date October 14, 2026, with US federal holidays removed. Each value has its own page and adjusts to your local today there.
| Length of lookback | Points back to |
|---|---|
| 21 business days ago | September 14, 2026 |
| 25 business days ago | September 8, 2026 |
| 28 business days ago | September 2, 2026 |
| 45 business days ago | August 10, 2026 |
| 60 business days ago | July 20, 2026 |
| 90 business days ago | June 4, 2026 |
For informational purposes only
This calculator provides general estimates based on business day counting rules. It does not constitute legal advice. Deadlines in legal, regulatory, or contractual matters may be subject to jurisdiction-specific rules, court orders, or statutory exceptions. Always verify critical deadlines with a qualified professional.