Tester’s Day is 9 September: how many days are left until the day of software testers, which weekday it falls on in 2027 and where the date comes from.
An informal day of software testers. The date is 9 September: on that day in 1947 a moth was found stuck in a relay of the Mark II computer and logged as the “first actual case of bug being found”.
This year—the year is worked out in your browser
Next year—the year is worked out in your browser
Day off or working dayWorking daycelebrated, but the day is a working one
Working days left—holidays and moved days off included · work calendar →
Long weekend—the date does not sit next to a weekend
How the date is worked out9 Septemberthe same rule every year
By day of the week— Mondays · — Fridays
How many Mondays, Fridays and other weekdays are left until Tester’s Day. Worked out in your browser, by your own clock.
Mon—
Tue—
Wed—
Thu—
Fri—
Sat—
Sun—
counting both today and the day of the event
01
Dates by year
independent of when you opened the page
20269 SeptemberWednesday
20279 SeptemberThursday
20289 SeptemberSaturday
20299 SeptemberSunday
20309 SeptemberMonday
02
Frequently asked questions
Tester’s Day: 9 September 2027, Thursday; 9 September 2028, Saturday; 9 September 2029, Sunday. The date follows a rule — 9 September — so it is known years ahead. The counter at the top always shows the nearest date, and the “Dates by year” block below lists five years.
The counter at the top of the page shows the days, hours and minutes left until Tester’s Day and updates every second by your device’s clock. On the day itself it shows “Today”, and from the next day it counts down to the following year. Nothing needs entering: the date follows the rule.
No, Tester’s Day is not a day off: it is not on the list of public holidays in Article 112 of the Russian Labour Code. If the date falls on a Saturday or Sunday, it is an ordinary weekend, but no day off is moved to Monday. Days off and moved days for the whole year are in the working calendar.
An informal day of software testers. The date is 9 September: on that day in 1947 a moth was found stuck in a relay of the Mark II computer and logged as the “first actual case of bug being found”. On this page: a live countdown, the date this year and next year, the weekday and the working days left until it.
Under the counter is a “Working days until the event” line — it counts the working days until Tester’s Day by the Russian working calendar, with public holidays and moved days off. Today is not counted, and for years with no published calendar yet the count follows a plain five-day week without holidays, which is noted on the page.
Press “Add to your site” under the counter: the widget builder opens with this event. Pick the size and theme, copy the code — a single iframe tag with no scripts — and paste it into an HTML block on your site. The widget updates itself, sets no cookies, congratulates visitors on the day and then counts down to Tester’s Day the following year.