All Dates Calculations

Dates, calendars & holidays

$2.99 · Designed for iPad. Not verified for macOS.

Dates and key religious holidays: Christianity, Judaism, Islam. Transform your smartphone into a universal date and calendar calculator. Professional, precise, and available in 6 languages. KEY FEATURES • Advanced temporal calculations Add or subtract days, weeks, months, years to any date with precision to a tenth of a second • Conversion between 7 calendars Gregorian, Julian, Hebrew, Islamic, Persian, French Republican, Indian National (Saka) • Moveable religious holidays calculator Easter (Catholic/Orthodox/Protestant), Ramadan, Eid, Hanukkah, Passover, Yom Kippur • Time difference calculator Precisely measure elapsed or remaining time in seconds, minutes, hours, days, weeks, months, years WHY ALL DATES CALCULATIONS? → Scientific precision with automatic validation → Intuitive interface and instant results → International formats adapted to your region → Support for historical and future dates → Astronomical calculations for lunar/solar feasts → Ad-free, reliable, fast 7 CALENDAR SYSTEMS → Gregorian: Modern international standard → Julian: Historical and genealogical research → Hebrew: Jewish luni-solar calendar → Islamic: Muslim lunar calendar (Hijri) → Persian: Iranian solar calendar → French Republican: Revolutionary calendar → Indian National: India's official calendar Instant bidirectional conversions between all systems. CALCULATED RELIGIOUS HOLIDAYS Christianity → Easter, Pentecost, Ascension Islam → Ramadan, Eid al-Fitr, Eid al-Adha, Mawlid Judaism → Hanukkah, Passover, Rosh Hashanah, Yom Kippur INTERFACE IN 6 LANGUAGES English • French • Spanish • Portuguese • Italian • German PERFECT FOR → Project management and deadline calculations → Historical research and genealogy → Multicultural event planning → Teaching history and cultures → International travel → Coordinating religious celebrations DOWNLOAD NOW Join users who trust All Dates Calculations to navigate through time and cultures with precision.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, Jean-Jacques Salindre, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Jean-Jacques Salindre
    Size
    • 27.1 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 12.0 or later.
    • iPhone
      Requires iOS 12.0 or later.
    • iPad
      Requires iPadOS 12.0 or later.
    • iPod touch
      Requires iOS 12.0 or later.
    • Mac
      Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 JJS Productions
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.