SLA / Business-Hours Deadline Calculator
Add business hours or business days to a start time, skipping weekends, holidays and non-working hours.
About this tool
A support-desk SLA and business-hours deadline calculator. Give it a start time and a number of business hours or business days to add, plus your working window, workdays and holidays, and it returns the exact deadline (date, time and day of week), the business hours consumed, and the real calendar time elapsed. Ideal for ticketing systems, response-time commitments and project due-date planning. Dates are parsed with invariant culture (yyyy-MM-dd HH:mm).
Frequently asked questions
How do I calculate an SLA deadline that respects business hours?
Set start=, add_hours= (or add_days=), and your work_start/work_end window. The tool steps forward consuming only working hours on workdays, skipping weekends and any holidays you list.
How do I exclude public holidays?
Add holidays= with one or more yyyy-MM-dd dates separated by semicolons or commas, e.g. holidays=2026-06-01;2026-07-04. Those days are skipped entirely.
Can I use a custom working week like Sun–Thu?
Yes. Set workdays= as a range (e.g. Sun-Thu) or a comma list (e.g. Sun,Mon,Tue,Wed,Thu). The window defaults to Mon-Fri 09:00–17:00.