- 10--10
- 10–10 calendars
- 12&12
- 122 Month Calendar
- 12 Months
- 13+13
- 13-Moon Calendar
- 1 January
- 2019 Poppets Town Calender
- 244 Month Calendar
- 26-day Month Calendar
- 28/293 Calendar
- 293-year cycle
- 293-year leap cycle
- 30,30,31 Ossipoff Minimum-Displacement
- 30x11 Calendar
- 36-day Month Calendar
- 360 Dates Calendar
- 364+7
- 365+1
- 4-4-5 Calendar
- 4-5-week month calendars
- 4-Week Leap Month Calendar
- 4-week month calendars
- 43/450 Calendar
- 4:100:400
- 4 weeks a month calendar
- 5-Week Leap Month Calendar
- 5-week month calendars
- 50-Week Calendar
- 52-Week Calendar
- 54-Week Calendar
- 5:40:400
- 6*6*10 calendar
- 6*6*10 regular calendar
- 6-Day Week Solar Calendar with common Muslim/Christian weekend
- 6-day Week Solar Calendar
- 6-day Week Solar Calendar with common Muslim/Christian weekend
- 6-week month calendars
- 60-Week Calendar
- 6 Day Week Solar Calendar
- 6 day-week Solar Calendar
- 7-week month calendars
- 7-weekday
- 8-days a week simple calendar
- 8 Day Week Calendar
- A1 Calendar
- ALTERNATE MONTH GREGORIAN CALENDARS
- A Calendar for Time to Come
- A Soli-Lunar Calendar
- Ab urbe condita
- Abysmal Calendar
- Academic Calendar
- Academic Calendar/12*4 weeks
- Academic Calendar/12×4 weeks
- Academic Calendar/13*1 hour
- Academic Calendar/3*12 weeks
- Academic Calendar/4*10 weeks
- Academic Calendar/5*9 weeks
- Academic Calendar/6*7 weeks
- Academic Calendar/7*6 weeks
- Academic Calendar/9*5 weeks
- Academic Calendar/Credit points
- Academic Calendar/Easter week distribution
- Academic Calendar/English terms
- Academic Calendar/Holiday week dates
- Academic Calendar/Lessons
- Academic Calendar/Primary and Secondary Education
- Academic Calendar/Primary school credit points
- Academic Calendar/School credit points
- Academic Calendar/Secondary school credit points
- Academic Calendar/Tertiary Education
- Aigyptian Calendar
- Akan calendar
- Albertan calendar
- Allitfeed
- Almost Decimal Calendar
- Alpo Balognia Calendar A
- Alternate Month Names for Use with Other Leap Week Calendars
- Alternate month Gregorian calendars
- Alternate month names for use with Symmetry Calendars
- Alternate month names for use with leap week calendars
- Alternative and Proposed Calendars
- Alternative month names for use with Accounting Leap Week Calendars
- Amended Julian Worldwide Calendar
- Ancient Rome
- Anno Domini
- Anno Scribere
- Annuary Calendar
- Annus Novus Decimal Calendar
- Apr April
- April
- Arabic names of calendar months
- Archaeoastronomy
- Archetypes Calendar
- Arctic Circle
- Aristean Calendar
- Arithmetic Calendar
- Arithmetic calendar
- Armelin calendar
- Armenian calendar
- Assyrian calendar
- Astronomic Soli-Lunar Calendar
- Astronomical Blue Moon Calendar
- Astronomical Season Calendar
- Astronomical Topics Relevant to Calendars
- Astronomical and Gregorian Easter
- Astronomical calendar
- Astronomical year numbering
- Attic calendar
- Aug August
- August
- Ayyám-i-Há
- Aztec calendar
- Babylonian calendar
- Bahá'à calendar
- Baishakh (Nepali calendar)
- Balanced French Calendar
- Bangla Calendar
- Bengali calendar
- Berber calendar
- Biblical Calendar
- Bikram Sambat
- Bikram Samwat
- Blue moon
- Boishakh
- Bonavian Civil Calendar
- Broadcast calendar
- Buddhist calendar
- Business quarter
- Byzantine calendar
- CCC&T
- Cal7
- Calculating the day of the week
- Calendar
- Calendar 13
- Calendar date
- Calendar era
- Calendar of International
- Calendar of the Rainbow
- Calendar reform
- Calendar year
- Calendars Currently In Use
- Calendars actually in use
- Calendars currently in use
- Calendrical calculation
- Calendrical software
- Callippic cycle
- Callippus
- Carl Friedrich Gauss
- Catholic Calendar
- Celestial Calendar
- Celestial Calendar, Universal (UCC)
- Celtic Tree Calendar
- Celtic calendar
- Century leap year
- Cesidian calendar
- Cesidian law
- Cesidio Tallini
- Chat-url
- Chinese calendar
- Chinese calendar correspondence table
- Chinese constellation
- Chinese era name
- Christian Calendar
- Chronology
- Chronometry
- Clock Calendar
- Coligny calendar
- Common-Civil-Calendar-and-Time
- Common Calendar
- Common Era
- Common Era Calendar
- Common era
- Common year
- Common year starting on Friday
- Common year starting on Monday
- Common year starting on Saturday
- Common year starting on Sunday
- Common year starting on Thursday
- Common year starting on Tuesday
- Common year starting on Wednesday
- Comparison of World Calendar and Gregorian Calendar
- Comparison of world calendar and gregorian calendar
- Computus
- Continued fraction
- Coordinated Universal Time
- Coptic calendar
- Corresponding Months
- Cotsworth Calendar
- Country Specific Islamic Calendar - Hijri Calendar Introduction
- Creation Calendar
- Cyberterra Mean Time
- Cycles and Periodicities
- Cyclic Calendar
- Cyclic era
- Darian calendar
- Dark moon
- Date
- Date format by country
- Davidian Martian Calendar
- Day
- Day of Quarter notation for Gregorian Calendar
- Day of the week
- Days
- Days Of The Week
- Days of the week
- Dec December
- Decad
- December
- Decimal 3-Year Calendar
- Decimal calendar
- Dee-Cecil Calendar
- Dee-Cecil calendar
- Dee Calendar
- Dee calendar
- Delta T
- Denary system of measurement
- Discordian calendar
- Discworld calendar
- Dominical Letter Calendar
- Dominical letter
- Doomsday algorithm
- Double-Month Calendar
- Double Rainbow Calendar
- Double Week Calendar
- Dove Calendar
- Earth Calendar
- Earth Epic Calendar
- Earthly Branches
- Easter
- Easter Calendar
- Easter controversy
- Ecclesiastical new moon
- Ecliptic Calendar
- Ectolanguages
- Edwards perpetual calendar
- Egyptian calendar
- Eid al-Fitr 2017 - Holidays Date and End of Ramadan 2017 Fasting Date
- Enoch Calendar
- Epact
- Epoch
- Epoch (reference date)
- Equinox
- Era
- Erisian (or Discordian) Calendar
- Essene Calendar
- Ethiopian calendar
- Eurasian Calendar
- Feb February
- February
- February 2018
- Filianic calendar
- Five Seasons Calendar
- Fixed Festivity Calendar
- Fixed Festivity Day Calendar
- Fixed Festivity Week Calendar
- Fixed Quarters Calendar
- Fixed Terran Calendar
- Fixed Week Calendar
- Florentine calendar
- Freeman Calendar
- French Republican Calendar
- French Republican calendar
- French Revolutionary Calendar
- French Revolutionary calendar
- Friday
- Full moon cycle
- GEO
- Global Earth Oceans
- Goddess Lunar Calendar
- Gorman Calendar
- Gregorian Calendar
- Gregorian calendar
- Greyhawk Calendar
- Haab'
- Hanke-Henry Permanent Calendar
- Harmonized Calendar
- Heavenly Stems
- Hebrew Calendar
- Hebrew calendar
- Hec Heckerber
- Hectoday Calendar
- Hellenic calendar
- Hermetic Leap Week Calendar
- Hermetic Lunar Week Calendar
- Hexad
- Hijri calendar
- Hindu Calendar
- Hindu calendar
- Hipparchic cycle
- Historical Calendars No Longer in Use
- Historical calendars no longer in use
- Holiday
- Holiday Month
- Holiday week dates
- Holocene calendar
- Human Calculator Calendar
- ISO-Uncia Leap Week Calendar
- ISO 8601
- ISO 8601 enhancements
- ISO week date
- Ibisystem
- Icelandic calendar
- Igbo calendar
- Immutable Cycle Calendar
- Indian National Civil Calendar
- Indian national calendar
- Indigo race
- Inter gravissimas
- Intercalary
- Intercalary year
- Intercalation
- International Calendar
- International Calendar/Academic year
- International Calendar/Astro formats
- International Calendar/Astro year
- International Calendar/Date marker
- International Calendar/Deprecated formats
- International Calendar/Different weeks
- International Calendar/Digit-only formats
- International Calendar/Fiscal year
- International Calendar/Grammar
- International Calendar/Hour formats
- International Calendar/Legacy formats
- International Calendar/Legacy time formats
- International Calendar/Mixed formats
- International Calendar/Month formats
- International Calendar/Offset formats
- International Calendar/Proposed time formats
- International Calendar/Shift formats
- International Calendar/Templates
- International Calendar/Truncated formats
- International Calendar/Week formats
- International Calendar/Year formats
- International Civil Calendar
- International Date Line
- International Easter Calendar
- International Fixed Calendar
- International Fixed Calendar League
- International Liturgical Calendar
- International Month Calendar
- International Standard Calendar
- International Standard Calendar/Astro year
- International Standard Calendar/Deprecated formats
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