SLA Deadline Calculator - Service Level Agreement Dates
Last reviewed: October 14, 2026
Calculate the exact deadline for any SLA window measured in business days. Enter the date a ticket, incident, or request was opened, set your SLA window, and the calculator returns the precise due date, automatically excluding weekends and public holidays.
Example SLA windows, the four the chart below uses: 1 business day for critical issues, 3 business days for high priority, 5 business days (one five-day working week) for normal priority, and 10 business days for low-priority requests. Your contract sets its own windows; the calculator takes any whole number of business days.
An example SLA tier structure
Support contracts set their own priority tiers and windows, so the chart below is an example, not a standard. It gives four priorities the four windows named above, 1, 3, 5 and 10 business days, and computes each due date for the same ticket with the US holiday calendar, so you can see how a weekend and a public holiday push every deadline back.
Example tier structure, not a standard
Ticket opened Friday, May 22, 2026 · Example using the United States holiday calendar
| Priority | Window | Due date |
|---|---|---|
| P1 critical | 1 business day | Tue, May 26 |
| P2 high | 3 business days | Thu, May 28 |
| P3 normal | 5 business days | Mon, Jun 1 |
| P4 low | 10 business days | Mon, Jun 8 |
United States holiday dates: U.S. Office of Personnel Management (opm.gov) (opens in a new tab), reviewed July 20, 2026.
Worked example: a tiered MSP support contract
Take a managed service provider whose service agreement, in this example, sets four severity tiers: a one-hour response during business hours for Severity 1, four business hours for Severity 2, one business day for Severity 3 and five business days for Severity 4. A Severity 3 ticket opens at 4:30pm Eastern on Friday, May 22, 2026. With the US holiday calendar, the one-business-day clock skips the weekend and Memorial Day on Monday, May 25, so the response is due by the end of business on Tuesday, May 26. Reading the SLA as "the next calendar day" would have put the deadline on Saturday.
Four timing questions to settle in the contract
Four questions decide whether a deadline was met. First, business hours or business days: a four-business-hour SLA with a 9am to 5pm support window gives a ticket opened at 3pm two hours that day and two the next morning, so it is due at 11am, not at 7pm. Second, observed days: for US federal employees on a Monday-to-Friday week, the Office of Personnel Management says a holiday that falls on a Saturday is usually observed on the Friday before, and one that falls on a Sunday on the Monday after, so a calendar that keeps only the literal date misses the day off. Third, when the clock starts: with the same 9am to 5pm window, a ticket opened at 4:55pm on a Friday under an eight-business-hour SLA is due at 4:55pm on Monday if the clock starts at submission, or at 5pm on Monday if it starts at the next business hour. Fourth, whose calendar: a provider and a customer in different countries have different holidays, and the contract has to say which side's closures stop the clock.
When the SLA contract is silent on holidays
If a service agreement defines "business day" without saying which holidays apply, the answer is not in the agreement, and a ticket opened the day before a holiday is where the question surfaces. In the United States, the legal public holidays are listed in 5 U.S.C. 6103, and this site's US calendar uses that list with the observed-day rule above. Whatever calendar your team applies, write it down where the customer can see it (in the SLA tracking tool, the runbook and the status page) and agree it before the first breach review. Review the list each January: in 2026, for example, Independence Day falls on a Saturday and is observed on Friday, July 3.
For a renewal or an audit, keep three things together for each ticket: the deadline this calculator gave, the country calendar it used, and the SLA clause that sets the window. A disputed breach can then be recomputed from the same inputs.
Sources for these rules
- 5 U.S.C. 6103: the legal public holidays, and (b) the Friday before a Saturday holiday (U.S. Government Publishing Office (govinfo))
- Federal Holidays: the yearly schedules (2026: Monday, May 25, Memorial Day; Friday, July 3, Independence Day; Wednesday, November 11, Veterans Day), and the note that most Federal employees work on a Monday through Friday schedule, for whom a holiday on a nonworkday usually is observed on Monday (if it falls on Sunday) or Friday (if it falls on Saturday) (U.S. Office of Personnel Management)
- Regulation (EU) 2016/679 (GDPR), Article 12(3): information on action taken on a request under Articles 15 to 22 without undue delay and in any event within one month of receipt of the request; that period may be extended by two further months where necessary (The National Archives (legislation.gov.uk), Official Journal text)
- GDPR Article 15: Right of access by the data subject (legislation.gov.uk (Regulation (EU) 2016/679, as adopted by the EU))
- California Consumer Privacy Act (CCPA): businesses must respond to a request to know, delete or correct within 45 calendar days and can extend that by another 45 days; to a request to opt out as soon as feasibly possible, up to a maximum of 15 business days from the date they received it (State of California, Department of Justice, Office of the Attorney General)
Checked October 12, 2026. All sources
For informational purposes only
This calculator provides general estimates based on business day counting rules. It does not constitute legal advice. Deadlines in legal, regulatory, or contractual matters may be subject to jurisdiction-specific rules, court orders, or statutory exceptions. Always verify critical deadlines with a qualified professional.