Five Seasons Calendar is a  proposed Standard Year by Stavros Daliakopoulos, Greece.

The proposal consists of four large periods of 84 days and one small period of 28 days, i.e. 12 weeks and 4 weeks, respectively.

The seven-day week cycle is preserved but there are no more months.

First Period
Mon Tue Wed Thu Fri Sat Sun
01 02 03 04 05 06 07
08 09 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 37 38 39 40 41 42
43 44 45 46 47 48 49
50 51 52 53 54 55 56
57 58 59 60 61 62 63
64 65 66 67 68 69 70
71 72 73 74 75 76 77
78 79 80 81 82 83 84
Second period
Mon Tue Wed Thu Fri Sat Sun
01 02 03 04 05 06 07
08 09 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 37 38 39 40 41 42
43 44 45 46 47 48 49
50 51 52 53 54 55 56
57 58 59 60 61 62 63
64 65 66 67 68 69 70
71 72 73 74 75 76 77
78 79 80 81 82 83 84
Third period
Mon Tue Wed Thu Fri Sat Sun
01 02 03 04 05 06 07
08 09 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Fourth period
Mon Tue Wed Thu Fri Sat Sun
01 02 03 04 05 06 07
08 09 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 37 38 39 40 41 42
43 44 45 46 47 48 49
50 51 52 53 54 55 56
57 58 59 60 61 62 63
64 65 66 67 68 69 70
71 72 73 74 75 76 77
78 79 80 81 82 83 84
Fifth period
Mon Tue Wed Thu Fri Sat Sun
01 02 03 04 05 06 07
08 09 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 37 38 39 40 41 42
43 44 45 46 47 48 49
50 51 52 53 54 55 56
57 58 59 60 61 62 63
64 65 66 67 68 69 70
71 72 73 74 75 76 77
78 79 80 81 82 83 84: Double or triple Sunday

To complete the 365-day cycle, the last Sunday of the year will be a "double" Sunday (DS), meaning it will have 48 hours instead of 24, so that the seven-day week is preserved. The same principle will apply for the leap years so we have a "triple" Sunday (TS) every 4 years that has 72 hours instead of 24.

Advantages[edit | edit source]

  • No months to memorize  
  • No 13 months as other proposals   
  • The first weekday of the week is Monday as per ISO 8601
  • No Friday the 13th days (only five 13s in the whole calendar)
  • Each large period has 12 weeks
  • One small period has 4 weeks
  • Symmetrical (half year is 2 large and 1/2 small periods, or 182 days), so statistical comparisons are more accurate  
  • Quarterly statistics are also easier (91 days for each quarter although they intercept periods)
  • Every day falls on the same weekday in each period (e.g. the 9th always falls on a Tuesday)  
  • Each large period can be divided by 2, 3, 4 and 6. The small period can be divided by 2 and 4.
  • The calendar is the same every year (perennial), unlike the annual Gregorian calendar, which differs from year to year  
  • Scheduling is easier for institutions and industries with extended production cycles.
  • Movable holidays would be able to have a fixed date while keeping their traditional weekday.
  • The periods could be given historical names.

Disadvantages[edit | edit source]

  • Birthdays, significant anniversaries, and other holidays would need to be recalculated as a result of a calendar reform, and would always be on the same day of the week
  • Large day count in periods.
  • Does not assign unique dates to the 364th, 365th (and 366th) days of a year.
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