About TimeMath

What We Do

TimeMath is a collection of free time, date, and timezone tools built for people who work across time zones every day. Whether you're a developer converting Unix timestamps, a remote team scheduling across continents, or a traveler planning around daylight saving transitions, every tool on this site is designed to give you a fast, accurate answer without friction.

We cover four core areas: timezone conversion and comparison tools for working across regions, date and duration calculators for counting days, weeks, and months between events, time format converters for switching between 12-hour, 24-hour, decimal, and ISO 8601 formats, and developer utilities for working with epoch timestamps, cron expressions, and UTC offsets.

Why We Built This

Time math is deceptively hard. Daylight saving transitions shift offsets twice a year in some regions and never in others. Months have unequal lengths. Business days exclude weekends and holidays. Epoch timestamps overflow 32-bit integers in 2038. These edge cases trip up developers and non-developers alike, and most online tools either oversimplify the problem or bury the answer behind ads and sign-up walls.

We built TimeMath because we wanted tools we could actually rely on for production debugging, meeting scheduling, and deadline planning. Every calculator handles the tricky cases — leap years, DST boundaries, timezone abbreviation ambiguity, overnight shift calculations — so you don't have to think about them.

How It Works

Every tool on TimeMath runs entirely in your browser. There are no accounts, no sign-ups, and no server-side processing. Your data never leaves your device. Calculations use the browser's built-in Intl API and IANA timezone database, which means timezone offsets, DST transition dates, and locale-specific formatting are always current and accurate.

We validate our results against multiple reference implementations — POSIX date utilities, Python's datetime and pytz libraries, and the ICU timezone database — to ensure correctness across edge cases. When a tool involves subjective choices (like which day starts the week, or how to count partial months), we document the convention used and explain the alternatives.

Editorial Standards

Content on TimeMath is written to explain, not to sell. Every calculator page includes educational sections that describe how the underlying math works, what the common pitfalls are, and when a particular approach does or doesn't apply. We cover real-world use cases — payroll calculations, legal deadlines, project planning, developer debugging — because context determines which tool and which settings are right for your situation.

We update content when timezone rules change, when new IANA database releases affect DST transitions, or when user feedback reveals a gap in our explanations. If a government changes its timezone offset or DST policy, we verify that our tools reflect the updated rules.

Important Disclaimer

TimeMath provides educational tools and general information about time and date calculations. Calculator results are based on your inputs and standard algorithms — actual requirements may vary depending on your jurisdiction, employer, or specific use case. Always verify critical time-sensitive decisions (legal deadlines, payroll, travel bookings) against authoritative sources. See our full terms & disclaimer for details.

Contact

Have a question, found a bug, or want to suggest a tool? We'd love to hear from you. Visit our contact page to get in touch.