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Quick comparison of calendars with 13 months of 28 days each
Calendar Leap item Leap position Leap rule Naming Year start 1st day Days without week Days without month
28/293 day flexible 294th day numeric Dec solstice  ? 00
Abysmal day end 4:128 numeric Dec solstice Sat 1+1+
13 day end 4:100:400 numeric Dec solstice  ?  ??
Filianic day end  ? feminist Mar equinox Sun 00
Intl. week end ISO numeric W01-1 Mon 00
Intl. Fixed day end 4:100:400 + 07 “Sol” Jan01 Sun 1+1+
Jaktober day start 4:33 + 13 “Jaktober” Dec solstice Mon 1+1+
Kluznicki day end astronomic + 07 “Aten” Dec solstice Mon 1+0
Markels day end  ? zodiac Sagittarius Sun 1++
Modern Christian day end 4:33:293 Christian  ? Sun 1+1+
Pax week almost end  %6 & 99 & 100:400 + 12 “Columbus” W01-1 – 1 Sun 0(7)
Positivist day end 4:100:400 philosophic 1789-01-01 Mon 1+0
Riparian day end  ? traditional + changes Mar01  ? 00
Sentinel week middle 6:50 lessons Mar equinox Sun 00
Sol day end 4:100:400 + 07 “Sol” Jan01 Sun 00
Terran Comp. day end 4:128 numeric Dec solstice  ? 1+1+
Leap-Month month flexible 294th month numeric Esperanto Jan Mon 00
Todd’s day end  ? zodiac  ?  ?  ?1+

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