Contact Our Team
Have a question about our time calculators, want to report a formula edge case, or have an idea for a new feature? We welcome your feedback.
General Inquiries
Questions regarding our time addition, subtraction, or timesheet calculation tools. We typically reply within 24 to 48 business hours.
Bug & Formula Reports
Spotted an unexpected carryover behavior or edge case? Please share your input numbers and browser details so we can investigate promptly.
Feature & Translation Ideas
Need a specific time calculator format or noticed a localization improvement for one of our 18 languages? Let us know what you need.
Direct Support Email
Send Us a Direct Message
Complete the form below and our team will get back to you directly via email.
Frequently Asked Questions
How does the calculator ensure accuracy?
Our calculators use integer-based sexagesimal (base-60) arithmetic algorithms. Seconds are summed and carried into minutes, and minutes into hours, completely avoiding the floating-point rounding errors common in standard calculators.
Are my entered hours or shift numbers stored on your servers?
No. All calculations run 100% client-side in your device's browser memory. We never store, log, or transmit the numbers, shift hours, or notes you enter.
Are these tools free for commercial and business use?
Yes. All calculators on Time Addition Calculator are completely free for personal, educational, and commercial purposes—including payroll calculation, project billing, and shift management.
Where can I learn more about specific formulas and tools?
Visit our Blog & Guides for comprehensive walkthroughs on time calculation, timesheet preparation, and sexagesimal arithmetic, or learn more on our About Us page.