10 days before 19 August 2026 is Sunday, 9 August 2026
Counting back 10 days from Wednesday, 19 August, and not counting today itself, the answer is Sunday, 9 August 2026. Written out, that is 2026-08-09 in ISO 8601 form, 8/9/2026 in the US month-first format and 09/08/2026 day-first. It falls in ISO week 32 of 2026 and is day 221 of 365, with 144 days of 2026 still to run after it.
The same span, counted other ways
10 calendar days is 1 week and 3 days, about 0.33 months, and 240 hours. Counting only Monday to Friday there are 7 weekdays and 3 weekend days in it, and after removing 0 US federal holidays that leaves 7 business days. If what you actually want is 10 business days rather than 10 days, that is a different date.
Sunday, 9 August 2026 is not a public holiday or a notable observance. The nearest one is Labor Day on 7 September 2026, 29 days later (countdown). The answer does land at a weekend — it is a Sunday — so if it is a deadline that has to be met on a working day, the practical date is 10 August 2026.
Does today count?
No — and this is where calculators disagree, so it is worth being explicit. On this page day 1 is yesterday, 18 August 2026, and the start date is not included. That gives Sunday, 9 August 2026. If your contract, court rule or notice period counts today as day one, the answer you want is one day later: Monday, 10 August 2026. Both numbers are on this page deliberately, because re-checking an off-by-one on a second site is the most common reason anyone looks a date offset up twice.
Every convention used above — whether the start date counts, how month ends are clamped, which holidays close an office — is written out on the methodology page, including the business-day rule and the holiday set behind the 7-business-day figure above.