29 days before 19 August 2026 is Tuesday, 21 July 2026
Counting back 29 days from Wednesday, 19 August, and not counting today itself, the answer is Tuesday, 21 July 2026. Written out, that is 2026-07-21 in ISO 8601 form, 7/21/2026 in the US month-first format and 21/07/2026 day-first. It falls in ISO week 30 of 2026 and is day 202 of 365, with 163 days of 2026 still to run after it.
The same span, counted other ways
29 calendar days is 4 weeks and 1 day, about 0.95 months, and 696 hours. Counting only Monday to Friday there are 21 weekdays and 8 weekend days in it, and after removing 0 US federal holidays that leaves 21 business days. If what you actually want is 29 business days rather than 29 days, that is a different date.
Tuesday, 21 July 2026 is not a public holiday or a notable observance. The nearest one is Independence Day on 4 July 2026, 17 days earlier (countdown). It falls on a Tuesday, a normal working day.
The span crosses 1 month boundary: it runs from August 2026 into July 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 Tuesday, 21 July 2026. If your contract, court rule or notice period counts today as day one, the answer you want is one day later: Wednesday, 22 July 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 21-business-day figure above.