Chrono Calc: Date & Time Calc

Chrono Calc (Date & Time Calculator) is an intuitive date, time, and duration calculator that lets you perform time-based math just like using a standard calculator. Whether you need to know "What is the exact date and time 3 days and 5 hours from now?", "How much time has elapsed between two timestamps?", or "How long will a 2-hour 30-minute task take if repeated 3 times?", Chrono Calc gives you instant, accurate answers with a clean and simple interface. ■ Versatile Date & Time Calculations • Date & Time ± Duration: Add or subtract durations from a starting date/time to find your target timestamp. Example: 2026/08/06 10:00 + 3d 5h = 2026/08/09 15:00:00 • Date & Time – Date & Time: Calculate the exact elapsed duration or difference between two dates/times. Example: 2026/08/09 15:00 – 2026/08/06 10:00 = 3d 5h • Duration ± Duration: Combine or subtract multiple durations to get total or remaining time. Example: 2d 5h + 3d 10h – 1d 2h = 4d 13h • Duration × Number: Multiply a duration by a scalar for repeated tasks or schedules. Example: 2h 30m × 3 = 7h 30m • Duration ÷ Number: Divide a total duration into equal parts. Example: 10h ÷ 3 = 3h 20m • Duration ÷ Duration: Find out how many times a duration fits into a given timeframe. Example: 10h ÷ 3h = 3.33 ■ Fast Input & One-Tap Unit Conversion • "NOW" Button: Insert the current date and time (down to the second) or today's date with a single tap. Entering time only automatically defaults to today's date. • Unit Conversion Dropdown: Instantly switch your calculation result between Standard (d/h/m/s), Total Hours (h), Total Days (d), and Total Seconds (s). • Calculation History: Past calculations are saved automatically. Tap any history item to reload its expression directly back into the calculator. ■ Customizable to Fit Your Style • 6 Color Themes: Choose from Emerald Forest, Ocean Blue, Sunset Glow, Royal Lavender, Lemon Electric, and Sakura Blossom. • Dark Mode & Dynamic Color: Full support for Dark Mode and Material You wallpaper-based colors. • Flexible Date Formats: Switch between YYYY/MM/DD, MM/DD/YYYY, and DD/MM/YYYY to match your region. • Keep Screen On: Optional setting to prevent your screen from turning off while working. ■ Upgrade to Pro (One-Time Purchase) for Power Features • Business Day Calculation & Custom Holidays: Register up to 50 custom holiday rules (weekly days off, specific dates/ranges, or Nth weekday of every month) and convert durations into actual working business days. • Remainder Calculation: View exact quotients and remaining time fractions when dividing durations (e.g., 10h ÷ 7 = 1h 25m 42s (rem. 6s)). • Expanded History, Memos & Pinning: Expand your history limit up to 100 entries (20 on Free), attach memos (up to 50 chars) to each result, and pin important entries to protect them from bulk deletion. • Data Backup & Restore: Easily export and restore your settings, custom holidays, and calculation history. • Completely Ad-Free: Enjoy a distraction-free workspace with no advertisements. ■ Perfect For • Project management, work-hour estimation, and deadline planning • Timesheet tracking, shift scheduling, and overtime calculation • Video, audio, and podcast runtime or editing calculations • Counting down days and hours to upcoming events or milestones