Contracts are full of time-sensitive language: "within 30 business days," "14 days' written notice," "respond within 5 business days." Getting the count wrong can mean breaching a contract without even realizing it.
The 3 Types of Contract Deadlines
1. Notice Periods
Used for termination, renewal, or cancellation. Example: "Either party may terminate with 30 business days' written notice."
- Start counting from the day after notice is delivered (not the delivery day)
- If the last day falls on a weekend/holiday, it typically extends to the next business day
- 30 business days ≈ 6 calendar weeks
2. Response Windows
Used for proposals, dispute resolution, and approval processes. Example: "Buyer must respond within 5 business days."
- Usually starts from receipt, not sending
- 5 business days = 1 calendar week (Monday–Friday)
- 10 business days = 2 calendar weeks
3. Performance/SLA Deadlines
Used in service level agreements. Example: "Deliverables due within 20 business days of project kickoff."
Calculate any contract deadline
Enter your start date and number of business days — get the exact calendar date it falls on.
Open Deadline Calculator →Quick Reference: Business Days to Calendar Time
- 5 business days = 1 week
- 10 business days = 2 weeks
- 15 business days = 3 weeks
- 20 business days = 4 weeks (1 month)
- 30 business days = 6 weeks
- 60 business days = ~3 months
- 90 business days = ~4.5 months
These are approximations — holidays can shift the actual date. Always use the calculator for precision.
International Contracts: Watch Out
When a contract involves parties in different countries, clarify:
- Whose holidays apply? — The sender's country, the recipient's, or both?
- What's the governing law? — This determines which definition of "business day" applies
- Time zones matter — "End of business day" in New York is different from London
Our calculator supports 50+ countries with accurate holiday calendars to handle exactly these scenarios.
Best Practices for Contract Writers
- Always define "business day" in the definitions section
- Specify whether start/end dates are included
- State which country's holidays apply
- Include a grace period for weekends/holidays ("if the deadline falls on a non-business day, it extends to the next business day")