
WhenAmI: Time & Date Calc
Add times, step through video
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Free
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About
WhenAmI is a fast, simple calculator for times and dates.
Type digits and the colons appear for you. Tap Sum or Diff and the answer appears instantly, right below your two times.
STEP THROUGH LONG RECORDINGS
WhenAmI was built for splitting long video recordings into individual episodes. Enter where the first episode starts and how long an episode runs. Tap Sum to find roughly where the next one begins, fine-tune the result if the breaks ran long, then tap Reset to make it your new starting point. Your episode length stays put, even after you close the app.
TIME CALCULATOR
• Add or subtract hours, minutes, and seconds — hours aren't limited to 24
• Optional milliseconds for precise timecodes
• Edit the result before using it
• Reset moves the result into Time 1 for the next calculation
• Copy the result to paste into another app
• Diff can always be positive, or show negative results — your choice
DATE CALCULATOR
• Difference: the time between two dates in years, months, and days, plus total days and weeks
• Optional business-day count that skips weekends
• Add / Subtract: move a date by days, weeks, months, or years
• Pick dates with simple month, day, and year wheels
DESIGNED FOR EVERYONE
• High-contrast classic blue and yellow look, or follow your system's light and dark mode
• Works with VoiceOver, which reads each result aloud
• Supports larger text sizes
• Large, easy-to-tap buttons
PRIVATE BY DESIGN
WhenAmI collects no data. No accounts, no ads, no tracking. Everything stays on your device.
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What's New in WhenAmI
1.0
October 30, 2026




