Calendars
Advanced calendar utilities for planning and scheduling. Calculate working days excluding holidays, determine leap years, finding the day of the week for any date, and generate printable calendar schedules.
Convert your Gregorian birth date into the Chinese Sexagenary cycle. Generates the Year, Month, Day, and...
Enterprise-grade leap year verification. Features a visual algorithm pipeline, developer code snippets (25+ languages), range generation,...
Professional-grade date interval engine. Features multi-national holiday databases, adjustable weekend logic, and precise duration breakdowns (Unix...
Calculate future or past dates by adding/subtracting years, months, and days. Includes business day logic excluding...
Calculate the exact days, hours, and minutes until any future event. Features a comprehensive database of...
Generate a dynamic weekly fasting schedule for Great Lent based on the date of Orthodox Easter...
Advanced deadline calculator with dynamic holiday logic for 30+ countries. Exclude weekends, calculate date ranges, and...
Determine the variable start date and duration of the Apostles' Fast, which depends on the date...
Calculate the exact number of days, weeks, and months between two dates. Includes options for business...
Interactive 2026 shift calendar for emergency services (1/3 schedule). Track work shifts, plan holidays, and sync...
Interactive Nativity Fast planner tracking the 40-day Old Calendar Advent (Nov 28 - Jan 6). Calculates...
Plan your 2026 vacations around your 1/3 shift schedule. Features official holiday highlighting and overlap detection.
Calculate your 2 Work / 2 Rest schedule for 2026. Features an "Exceptions" system to handle...
Visualize the 3-days-on, 3-days-off pattern. Includes a monthly hours calculator for payroll estimation based on shift...
Calculate specific "Zentag" weeks in the Orthodox calendar where fasting is suspended. Identifies Publican & Pharisee,...
Calculate the exact calendar date from a specific day of the year (1-366), or find the...
Generate custom printable calendars for any month and year. Add events, choose week start day, highlight...
Calculate the exact date 180 days from today or any start date. Includes settings for business...
Calculate exactly what date is 100 days from today, or any custom date. Options to add,...
Generate calendar date matrix grids for any month. Configurable first day, locale, weekday format. Export as...
Interactive day of year calendar showing DOY numbers 1-365/366. Find any date's ordinal day number or...
Convert any Gregorian date to the Discordian calendar. Get season, day, YOLD year, holydays, and custom...
Convert any Gregorian date to the Pataphysical Calendar. Get the Pataphysical year, month, day, saint, and...
Professional ISO-8601 and US standard week calculator with reverse lookup, fiscal year mapping, and precise project...