How the deadline is worked out
Each edition's notice periods come from Sakhani's rules library: the clause, the period, whether it runs from the event or from when you became aware of it, and who must receive it. The period is counted from the day after that date.
Working-day periods skip weekends, public holidays and the builders' break. Calendar-day and week periods do not; if the last day lands on a weekend or holiday, the result says so, because the contract usually does not move it.
Your signed contract wins
The periods here are the standard, unamended conditions. Many contracts shorten them with special conditions or Z-clauses. Upload your signed contract to Sakhani and the amendments are read and applied to every deadline on your projects.
Worked example
On an NEC3 ECC project the contractor becomes aware on Monday 5 October 2026 that drawings due last week have not arrived. Under clause 61.3 a compensation event must be notified within eight weeks of becoming aware. Eight weeks from 5 October is Monday 30 November 2026. An early warning under 16.1 should go immediately.