Calc ProDate & Time Calculator for iPhone & iPad
Find the exact time between two dates, add or subtract time from a date, and see the phase of the moon for any day.
Take it with you
Coming soonFree with ads · In-app purchase unlocks the full Pro Premium version
Date & Time Calculator Features
Time between dates
Find the exact interval between two dates and times, in days, hours, minutes and seconds.
Add or subtract time
Add or subtract days, hours, minutes and seconds from a date to find a deadline or due date.
Lunar moon phases
See the phase of the moon for your start and end dates.
Day and week numbers
See the day of the week, day of the year and week number for any date.
Tape View
Results go to the tape so you can copy or e-mail them.
Great for
- Project deadlines
- Countdowns to events
- Ages and anniversaries
- Stargazing and night photography
Frequently Asked Questions
How do I count the days between two dates?
Set the start and end dates and times, then tap Calc. Calc Pro shows the interval in days, hours, minutes and seconds.
Does Calc Pro show moon phases?
Yes. The Date & Time Calculator shows the lunar moon phase for your start and end dates.
Is Calc Pro free?
Calc Pro is a free download on the App Store for iPhone and iPad, supported by ads. The Pro Premium in-app purchase unlocks the full version, including crypto rates, PDF export, and the newest financial worksheets, unit categories, constants and statistics tools.
Is Calc Pro available on Android?
An Android version of Calc Pro is coming soon to Google Play.
More in Calc Pro
Download Calc Pro
Calc Pro combines 10 powerful calculators with 23 financial worksheets. It's the trusted choice of students, professionals, and investors worldwide, and the only app that can truly replace your pocket calculator.
Coming soonFree with ads · In-app purchase unlocks the full Pro Premium version
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