Closing dates, addenda and time zones: the calendar traps that sink good bids
More good bids are lost to the calendar than to the competition: a closing time read in the wrong time zone, an addendum that went only to registered downloaders, a questions deadline that passed a week before the close, a portal that rejects a lodgement at one minute past. Each portal publishes its times in its own zone, Queensland does not observe daylight saving while the southern states do, and no portal accepts a late offer. The fix is a bid calendar built from the documents on day one and a registration on every portal you download from.
← All guides · Published 12 September 2026 · Written by Helm. Helm is independent and not affiliated with or endorsed by any portal named here.
Which clock the closing time is on
A closing time is stated in the portal's own zone. AusTender states Canberra time; QTenders and the Queensland Supplier Portal state Queensland time; SA Tenders and Contracts states Adelaide time; each other portal states its own. Queensland does not observe daylight saving and most southern states do, so between October and April a Queensland closing time is an hour earlier on a Sydney or Melbourne clock, and Adelaide sits half an hour behind the eastern states all year. Write the closing time in your own zone on the calendar entry, and treat the portal's clock as the only one that counts.
The deadlines before the deadline
- The questions period: most invitations stop accepting questions days before the close. A question after that date is not answered.
- Site inspections or briefings: some are mandatory, and missing one is a failed mandatory criterion.
- Prequalification, registration and licence checks: a portal registration or a prequalification with an approval queue must be in place before lodgement.
- Internal sign-off: the person who must approve the price is on leave in the closing week more often than seems possible.
Addenda: who receives them
Addenda and amendments usually go only to suppliers who downloaded the documents through their registered account. A bidder working from a colleague's copy, or from an anonymous download where the portal allows one, does not receive the addendum that moved the close, changed the specification or answered the question that mattered. Download under your own registration, and check the portal itself in the closing week rather than trusting the inbox.
Extensions and withdrawals
Buyers extend closing dates and withdraw tenders more often than new bidders expect. An extension is good news only if you learn of it; a withdrawal is a signal to ask the buyer what happened and whether the need will come back. Neither is announced anywhere but the portal and the addendum.
How Helm fits
Track a tender in Helm and its closing time joins your dashboard calendar in Brisbane time, with reminders at seven, three and one days and a daily digest of what is new and what is closing. Helm re-reads the listing and alerts you when the closing date moves and when a listing is withdrawn, and for tracked tenders it watches for fresh addenda between the daily runs. The registration and the download are still yours; Helm links you to the portal for both.