World Wide Digi DX Contest

Twenty-four hours of FT4 and FT8 across six HF bands on the last full weekend of August, scored on distance between grid squares.

Rules at ww-digi.comThe rules are the sponsor's. This page holds the dates and the facts.

When it runs

Last full weekend of August

1200Z Saturday → 1159Z Sunday

Times are UTC, as the sponsor states them.

Next runnings

1200Z Sat 28 Aug → 1159Z Sun 29 Aug · 23h 59m2027
in 331 days
Logs due 1159Z Tue 31 Aug
1200Z Sat 26 Aug → 1159Z Sun 27 Aug · 23h 59m2028
in 695 days
Logs due 1159Z Tue 29 Aug
1200Z Sat 25 Aug → 1159Z Sun 26 Aug · 23h 59m2029
in 1059 days
Logs due 1159Z Tue 28 Aug
1200Z Sat 24 Aug → 1159Z Sun 25 Aug · 23h 59m2030
in 1423 days
Logs due 1159Z Tue 27 Aug

Operating

Modes: FT8/FT4 FT4, FT8
Bands: 160m80m40m20m15m10m
Six bands only: 1.8, 3.5, 7, 14, 21 and 28 MHz.
Exchange: A four-character Maidenhead grid square.
Logs: due 2 days after the end
Who can enter: Anyone, anywhere.
'For amateurs around the world to contact as many other amateurs in as many Maidenhead Grid Fields as possible using the FT4 and FT8 modes.' No entity restriction is stated anywhere in the rules.

Where this comes from

Checked against the sponsor: Yes. The rule on this page was read off WWROF / Slovenia Contest Club's own published rules. Link last confirmed 2026-08-21.
What the source says: ww-digi.com, the contest's own site, which states the recurrence on its front page and the running in its rules: 'Contest is always the last full weekend of August.' 'Starts: Saturday August 29 12:00:00 UTC / Ends: Sunday August 30 11:59:59 UTC.' Mode: 'Only FT4 and FT8 modes are permitted.' Bands: 'Six bands only: 1.8, 3.5, 7, 14, 21 and 28 MHz.' Exchange: '4-character Grid Square.' Log deadline: 'All entries must be sent WITHIN 48 HOURS after the end of the contest: no later than 2359 UTC September 1, 2026.' Operating: 'A human operator must initiate calling each QSO partner. Autonomous systems or robots that emulate this action are prohibited.' Sponsored by the World Wide Radio Operators Foundation with the Slovenia Contest Club; the site's own copyright line reads 'Copyright (c) 2019-2026 World Wide Radio Operators Foundation, Inc.'
Recorded caveats: THE RECURRENCE IS THE SPONSOR'S OWN WORDS AND IT SURVIVES THE YEAR THAT TESTS IT. 'Last full weekend of August' and 'last Saturday of August' are different rules, and they diverge whenever 31 August is a Saturday -- the Sunday then falls in September, so that weekend is not full. 2024 was such a year. The sponsor's own 2024 rules PDF (ww-digi.com/rules/wwdigi24_eng.pdf) reads '2024 World Wide Digi DX Contest Starts: Saturday August 24 12:00:00 UTC Ends: Sunday August 25 11:59:59 UTC' -- the 24th, not the 31st. So the full-weekend reading is what WWROF actually runs, and nth_full_weekend with n = -1 is right. Checked against five dates the sponsor published itself: 24 Aug 2024, 29 Aug 2026, 28 Aug 2027, 26 Aug 2028 and 25 Aug 2029. All five are reproduced. THE LOG DEADLINE CHANGED FOR 2026, from five days to 48 hours. The 2024 rules said 'WITHIN FIVE (5) DAYS'; the current rules say 'WITHIN 48 HOURS'. log_deadline_days is 2 and this note exists so a reader comparing against an older edition is not misled. ALSO NEW AND WORTH READING BEFORE ENTERING: autonomous operation is prohibited. 'A human operator must initiate calling each QSO partner. Autonomous systems or robots that emulate this action are prohibited.' That is a rule about unattended FT8, which is how a lot of stations run this mode.

Something wrong? How to report it — a link to the sponsor's own page is all it takes.

Take it with you

Add to Google Calendar Subscribe (iCal)This record as JSON

Add to Google Calendar puts the next running in as a single event. It is one event, not a subscription — come back for the one after it, or use the feed below.

Subscribe (iCal) carries this contest's runnings for the next twelve months as UTC instants and keeps them current. Apple Calendar, Outlook and Thunderbird take this address directly. Its identifiers are stable across deploys, so re-subscribing does not duplicate anything: https://contestclock.com/api/ics?id=ww-digi

Google has no working one-click subscribe. Paste that address into Settings → Add calendar → From URL. Google then polls it on its own schedule, often 8–24 hours, and that cannot be forced — so use Add to Google Calendar above if you want the next running in your calendar now.