DayLogic is a handcrafted toolkit created to eliminate everyday micro-hassles—from date arithmetic and timezone coordination to developer utilities and financial projections.
Handcrafted by Daniel • Founder & Lead Developer
Hi, I’m Daniel. Like many developers, project managers, and digital creators, I found myself constantly turning to web utilities throughout the day: calculating elapsed business days for a sprint deadline, converting timezones for team meetings, validating a JSON payload, or estimating compound interest and mortgage amortizations.
Over time, however, using the web’s classic utility sites became an increasingly frustrating experience. Simple calculation pages had become bloated with disruptive video overlays, forced registration forms, sluggish server-side page reloads, and heavy tracking cookies that compromised user privacy.
I initially started coding these calculators and formatters for my own daily workflow—focusing on speed, precision, and complete client-side execution. As these tools proved indispensable in saving time and reducing cognitive friction in my own work, I decided to polish, expand, and share them freely with anyone who appreciates clean, honest software.
"My goal with DayLogic is simple: to create the kind of fast, distraction-free utility platform I genuinely want to use every single day—and to make it accessible to everyone with zero friction."
How we approach design, privacy, and software craftsmanship.
All formulas, conversions, and algorithms execute entirely inside your web browser. Experience instant output as you type with zero server round-trip latency.
Your calculation inputs, sensitive text snippets, financial numbers, and dates never leave your machine. We do not collect, process, or store your queries on our servers.
Built for modern professionals who value speed and clarity. No aggressive full-screen popups, no paywalls, and no sluggish page reloads.
Every tool is available immediately to anyone worldwide, without requiring account creation, login friction, or monthly subscriptions.
A growing suite of focused, purpose-built utilities.
Accurate business day counts, date offsets, milestone countdowns, and multi-city timezone coordination.
JSON formatters, Base64 converters, cryptographic hash tools, and rich text analysis utilities.
Loan amortization schedules, compound interest growth projections, and tip calculators.
Scientific BMR, TDEE, and macronutrient calculators based on peer-reviewed physiological formulas.
DayLogic is independently developed and maintained. To keep the servers running, domain active, and tools 100% free for everyone, we display non-intrusive advertisements served through Google AdSense. We promise never to lock core functionality behind paywalls or sell user data.
DayLogic grows through user feedback. If there is a calculation, conversion, or workflow you’d love to see automated, let Daniel know!