DatePrismCelebrating what connects us
DatePrism's primary goal is to create new occasions, to find new dates to celebrate with those close to you: the 1,000th day (or week, or month) since you met, since your child was born, since your appointment, since founding your practice or your workshop...
Every one of us, every organization, every reality begins at a precise moment and then evolves through significant events — locating them, remembering them and celebrating them is the culture that illuminates our relationships.
Light also passes through the prism of time
DatePrism calculates and converts your dates between the Gregorian calendar and the main Masonic calendars — French Rite, Scottish Rite, Royal Arch, Knights Templar — to find, place and celebrate the moments that matter.
The 1,000th day since you met
Find and celebrate the milestones of your personal life: meeting someone, a birth, an appointment, founding a company or a Masonic lodge.
Your Masonic anniversaries
Celebrate the anniversaries of your initiation, your Worshipful Master, or your Lodge, in the very calendar of your obedience.
Astronomical precision
Calculations are based on the JDN (Julian Day Number) system and follow the historical convention of having no year 0, adding the ISO 8601 format when needed.
Five calendars, one single app
DatePrism precisely converts a date between the Gregorian calendar and four traditional Masonic calendars, each with its own starting point and month numbering.
Gregorian Calendar
The reference civil calendar, used as the basis for input and comparison.
French Rite
Year "Anno Lucis", starting on March 1st, with traditional month numbering.
Scottish Rite
Year "Anno Mundi", starting on September 1st, according to Scottish tradition.
Royal Arch
Year "Anno Inventionis", counted from the discovery of the vault.
Knights Templar
Year "Anno Ordinis", referring to the founding of the Order.
DatePrism on Windows and Android
The same precise calculation logic, adapted to each platform.
Available in 5 languages
DatePrism automatically detects your system language and lets you change it at any time.
Free, no ads, no trackers
Ready to celebrate your next big day?