Best Date Calculation Assistant Apps

213+ iOS apps curated and reviewed

4.6 avg rating
17 free apps
Updated July 2026

Every iPhone needs a few good date calculation assistant apps. We benchmark 213+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Date Calculation Assistant Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Date Calculation AssistantDate Calculation AssistantFreeNoYesJun 2026
2Date and Time CalculatorDate and Time CalculatorFree4.7★ (9.1K)YesNoJul 2026
3TrumpTime Date CalculatorTrumpTime Date CalculatorFree4.7★ (799)NoNoJul 2026
4Date Calendar CalculatorDate Calendar CalculatorFree4.9★ (29)YesYesJul 2026
5The Date Calculator PROThe Date Calculator PROFree4.7★ (2.5K)YesYesJul 2026
6Date Wheel date calculatorDate Wheel date calculator$4.994.7★ (95)NoNoJul 2026
7Days + Date + Time CalculatorDays + Date + Time CalculatorFree4.7★ (795)YesNoJul 2026
8Time + Date CalculatorTime + Date Calculator$0.994.7★ (944)NoNoJul 2026

Top Picks for Date Calculation Assistant

Date and Time Calculator#2

Date and Time Calculator by 山 钟

Strong Contender
🔧 Utilities
4.7😐(9.1K ratings)
FreeAds
Date and Time Calculator screenshot 1
Date and Time Calculator screenshot 2
Date and Time Calculator screenshot 3

Calculate the exact number of days, hours, and seconds between any two dates. This tool also allows you to find the date before or after a specified period, making it useful for tracking deadlines, events, or financial products.

What We Love

  • 💡 Helpful for tracking dates and time
  • 👍 Simple and easy to use
  • 🚀 Accurate calculations
  • 🚀 Useful for various purposes (medication management, work timelines, etc.)

Room to Improve

  • 🐛 Ads are intrusive and difficult to close
  • 🐛 Compatibility issues on iPad
  • 🐛 Bugs with date/time calculations
TrumpTime Date Calculator#3

TrumpTime Date Calculator by Jonathan Blau

Trump's time in office
Worth Considering
🔧 Utilities
4.7(799 ratings)
Free
TrumpTime Date Calculator screenshot 1
TrumpTime Date Calculator screenshot 2
TrumpTime Date Calculator screenshot 3
TrumpTime Date Calculator screenshot 4
TrumpTime Date Calculator screenshot 5

Calculate the duration of a presidential term, including elapsed days, remaining days, and future projections. It also functions as a general date calculator for any two dates or time periods.

More Date Calculation Assistant apps to explore

4
Date Calendar Calculator
Date Calendar Calculator
Date Calendar Calculator
Calculate Calendar Date & Time
Free

This app helps you calculate date and time durations, add or subtract time from dates, and determine working days. It also converts between calendars and time zones, and estimates ovulation and pregnancy due dates. The design is simple and intuitive.

Calculate date and time durationsAdd/subtract time from datesCalculate working days
🔧 Utilities
(29)
free with in-app purchases
5
The Date Calculator PRO
The Date Calculator PRO
The Date Calculator PRO
Calculate days between dates
Free

Easily calculate the duration between two dates, with or without accounting for the time of day. You can also add or subtract various time units from a specific date. The results are automatically converted into multiple units for your convenience.

Calculate duration between two datesInclude time of day in calculationsAdd/subtract years, months, weeks, days
🔧 Utilities
(2.5K)
free with in-app purchases
6
Date Wheel date calculator
Date Wheel date calculator
Date Wheel date calculator
by Creative Algorithms
$4.99

This app calculates the time between two dates in various units, including months, weeks, days, and business days. It allows users to save calculations, set countdowns to important events, and track durations for both personal and professional use.

Calculate time between datesUnits: months, weeks, days, business daysSave and manage calculations
💼 Business
(95)
paid
7
Days + Date + Time Calculator
Days + Date + Time Calculator
Days + Date + Time Calculator
Days Between Two Dates
Free

Calculate the duration between two dates and times. This tool helps you find the exact number of days, hours, and minutes between any two points in time.

Calculate days between datesCalculate duration between dates and timesCalculate duration between times
📊 Productivity
(795)
ad-supported
8
Time + Date Calculator
Time + Date Calculator
Time + Date Calculator
Best tool to work with time
$0.99

Calculate time differences, work days, and add or subtract time periods. Convert between units like seconds, minutes, and years. Determine future or past dates and calculate age.

Calculate time differencesCalculate work daysAdd/subtract time
🔧 Utilities
(944)
free
9
Date Calculator - TimeRange
Date Calculator - TimeRange
Date Calculator - TimeRange
Work day counter & countdown
Free

Easily calculate the difference between dates, add or subtract days, and create custom countdowns. Personalize your workweek and skip specific dates for accurate workday calculations. Track events with home screen widgets and receive timely notifications.

Add/subtract days, weeks, months, yearsCustomizable workweek calculationsSkip specific dates
📊 Productivity
(196)
free with in-app purchases
10
Count (Date Calculator)
Count (Date Calculator)
Count (Date Calculator)
by JungHoon Noh
Free

Calculate the difference between two dates or add/subtract days from a specific date. Quickly find out how many days are left until an event or determine anniversary dates.

Calculate days until an eventDetermine anniversary datesAdd/subtract days from a date
🌟 Lifestyle
(9)
free
11
Time Calculator - Work Hours
Time Calculator - Work Hours
Time Calculator - Work Hours
Date, Calendar & Salary Clock
Free

This comprehensive toolkit helps manage time, dates, and schedules with various calculators. Track work hours, plan shifts, convert time formats, and calculate differences between dates. Ideal for professionals, freelancers, and everyday users needing precise time management.

Work time trackingShift schedulingDate difference calculation
🔧 Utilities
(2.7K)
freemium
12
Date & Time Calculator(9 in 1)
Date & Time Calculator(9 in 1)
Date & Time Calculator(9 in 1)
Best tool to work with time
$0.99

This app offers a comprehensive suite of tools for calculating and manipulating dates and times. It can determine time differences, calculate workdays, add or subtract time intervals, and convert between various time units. It also includes features for date ranging, time zone conversions, age calculation, and even a unique time travel function.

Time difference calculationWorkday calculation (excluding weekends)Add/subtract time (years to seconds)
💼 Business
(246)
free
13
Easy Date Calculator, Keyboard
Easy Date Calculator, Keyboard
Easy Date Calculator, Keyboard
Easily calculate target date
Free

Calculate future or past dates from a specific start point, or get the current date and time. Includes a custom keyboard for fast date entry in other applications and supports various date formats.

Calculate target datesGet current date and timeCustom keyboard for date entry
🔧 Utilities
(15)
free
14
Time & Date Calculator
Time & Date Calculator
Time & Date Calculator
Perform calculations with time
Free

Calculate exact durations between times, including seconds, and account for time zone differences and DST. View results in various units and share them easily. Supports a wide year range.

Calculate time duration to the secondCross time zone calculations with DSTView results in alternative time units
🔧 Utilities
(66)
free with in-app purchases
15
Julian Date
Julian Date
Julian Date
by Jevon Charles
Free

Convert between standard calendar dates and Julian dates. Supports 5-digit and full Julian date formats, including time. Also allows conversion from Julian dates back to calendar dates.

5 Digit Julian Date conversionFull Julian Date conversionCalendar Date to Julian Date
📊 Productivity
(2.7K)
paid
16
The Date and Time Calculator
The Date and Time Calculator
The Date and Time Calculator
Days Between Dates & Duration
Free

Easily calculate the duration between two dates and times. Add or subtract days and time to a specific date to find future or past events. Share your calculations and see results in various units like days, weeks, months, years, hours, minutes, and seconds.

Calculate time between datesAdd/subtract days and timeShare calculation results
🔧 Utilities
(19)
free
17
Date & Time Calculator Counter
Date & Time Calculator Counter
Date & Time Calculator Counter
Date & Time Counter, Countdown
Free

Calculate the difference between dates and times, or add/subtract durations. Save your important calculations to bookmarks and enjoy a dark mode option. All features are free to use.

Calculate date, time, and date & time differencesAdd and subtract dates, times, and date & timesSave calculations to bookmarks
🔧 Utilities
(21)
ad-supported
18
Date.s and Time.s Calculator.s
Date.s and Time.s Calculator.s
Date.s and Time.s Calculator.s
A Simple Date & Time calc
Free

Calculate the difference between dates and times with ease. This tool offers a professional and fast way to determine ages, anniversaries, experience durations, and specific time intervals like days, weeks, months, and years.

Age calculationAnniversary calculationExperience duration
📊 Productivity
(248)
free
19
Convert Date
Convert Date
Convert Date
by Fahad Alrashidi
Free

Easily convert dates between various calendar systems including Islamic, Gregorian, Hebrew, and more. Calculate age and access a history of your conversions. Share results as images.

Multiple calendar conversionsAge calculationConversion history
🔧 Utilities
(12)
free with in-app purchases
20
date and time calculator app
date and time calculator app
date and time calculator app
Date Calculator,Time and Date
Free

This utility app offers precise calculations for dates and times, helping users manage events, projects, and track important dates. It provides features for calculating time differences, adding or subtracting dates and times, and determining exact age.

Time CalculatorDate Difference CalculatorTime Difference Calculator
🔧 Utilities
(1)
free

FAQ about Date Calculation Assistant

Are there free date calculation assistant apps for iPhone?
Yes — 17 of the top date calculation assistant apps we rank are free to download, including Date Calculation Assistant and Date and Time Calculator.
Date Calculation Assistant has no ads and offers in-app purchases, according to its App Store listing as of July 2026.
We track 213+ date calculation assistant apps on the iOS App Store as of July 2026, ranked by rating, recency, and analysis of real user reviews.