About
About Deadline Calculator
Built by Michael Reynolds — a compliance professional who got tired of miscounting deadlines.
Who built this?
Michael Reynolds has spent over 12 years in compliance, legal operations, and regulatory affairs across the UK public and private sectors. Working with FOI teams, SAR response units, and contract management departments, he saw first-hand how easily a miscounted deadline could lead to regulatory breaches, missed statutory obligations, and costly disputes.
Michael built Deadline Calculator to solve the same problem he kept hitting: calculating response dates accurately across weekends, bank holidays, and the different counting rules that apply to FOI requests, SARs, cooling-off periods, notice periods, and complaint deadlines. What started as a quick internal reference tool became something he wanted to share with others dealing with the same frustrations.
When he is not maintaining the calculators, Michael tracks UK regulatory changes and updates the deadline tools to keep them aligned with current guidance from the ICO, FCA, and other UK regulators.
Why this site exists
Most UK deadline rules look simple on paper: “20 working days,” “one calendar month,” “14 days from delivery.” In practice, counting them correctly means knowing whether the clock starts on the day of receipt or the next working day, whether weekends and bank holidays are excluded, and what happens when the deadline lands on a non-working day.
Deadline Calculator handles these edge cases so you can check a date quickly without building a spreadsheet or second-guessing the rules. Every calculator is built around UK-specific legislation and regulator guidance, including the Freedom of Information Act 2000, the UK GDPR / Data Protection Act 2018, the Consumer Contracts Regulations 2013, and FCA complaint-handling rules.
What you’ll find here
- FOI deadline calculators — 20 working day response dates under the Freedom of Information Act 2000 and the Environmental Information Regulations 2004.
- SAR deadline calculators — one calendar month time limits for subject access requests under UK GDPR.
- Notice period calculators — end dates for 1 week, 4 weeks, 1 month, and custom notice periods, including tenancy notice tools.
- Cooling-off period calculators — 14 day cancellation deadlines under the Consumer Contracts Regulations.
- Complaint response calculators — FCA-style 8 week, NHS-style, and 20 working day complaint timelines.
- Business day calculators — quick tools for adding 5, 10, or 30 business days from today or before a date.
- Invoice and payment calculators — net 30 due dates, late payment interest, and holiday entitlement tools.
- Free downloadable templates — deadline tracker spreadsheets for SAR, FOI, complaint, and notice workflows.
Important: This site is a planning aid, not legal advice. Deadlines can depend on facts, policy wording, jurisdiction, service rules, pauses, extensions and changing law. Always verify important deadlines with the official guidance or a qualified adviser.