Convert date between Gregorian Calendar and The New Calendar

Clock Background
Gregorian Day Number The New Calendar
Month Day

 
Month Day

 

Dates of the Seasons

Northern Hemisphere Equinox and Solstice Dates Gregorian The New Calendar*
Spring March 20 Spring 17
Summer June 21 Summer 37
Fall September 22 Autumn 57
Winter December 21 Winter 1
*Dates of the Seasons don't vary, as the calendar starts the day of the Winter Solstice (Although the date ranges from the December 20-23, December 21, the day it usually falls on, is used in this calculator. The Solstice is always Comet 29 on the Solstice Calendar)

Information About the Calendar

The New Calendar Website
News Article about the Calendar
Moon Glow HEX color

The year begins on the Winter Solstice. The year is divided into 5 seasons of 73 days. There are 9 days in a week, named after the nine planets in our Solar System (Pluto is included)

Early (Season)
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36

The 37th day of each of the 5 seasons is an intercalendary day, not aligned to any day of the week marking the middle between the Early and Late halves of the seasons.

Late (Season)
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
38 39 40 41 42 43 44 45 46
47 48 49 50 51 52 53 54 55
56 57 58 59 60 62 62 63 64
65 66 67 68 69 70 71 72 73

Benefits of the calendar, as highlighted by the website:

The Seasons
  1. Winter (December 21 - March 3)
  2. Spring (March 4 - May 15)
  3. Summer (May 16 - July 27)
  4. Autumn (July 28 - October 8)
  5. Fall (October 9 - December 20)
The Science of The New Calendar

The day number each of the equinoxes and solstices lands on the calendar in relation to the length of the month is similar to the percentage of the year completed up to that point.

For instance, the Summer Solstice, marking the middle of the year, is also in the middle of the month Summer.

Season % of year complete % of month complete
Spring 25% 17/73 = 23.2%
Summer 50% 37/73 = 50.06%
Autumn 75% 57/73 = 78.1%
Winter 100% 73/73 = 100%