Cal7 is a proposed leap week calendar that heavily relies on the number seven. A week has, as usual, 7 days, but also a month has 7 weeks and a year has 7 months. The only deviation are odd-numbered months, which have 8 weeks, except for the last one where the eighth week is the leap week. A leap week occurs every 7th year and every 29th year (the rest of the leap rule is yet to be defined). Cal7 can thus be considered a loose solar calendar.
The ISO 8601-like date format is
±CCYY-M-W-D. If not specified otherwise, Cal7 agrees with this international standard, e.g. that Monday is the first day of the week.
In the table, an asterisk * denotes months that always include Holiweek and a dagger † shows the month that is 8 weeks long only in leap years.
Comparison[edit | edit source]
The following table compares Cal7 with similar proposals, assuming weeks start on Monday in all cases. The academic terms listed are synchronized with Cal7 months; they could be aligned with other months instead.
|Octalendar||month 1||month 2||month 3||month 4||month 5||month 6||month 7||month 8†|
|Academic (example)||Spring semester||Summer break||Fall semester|
|Winter semester||Summer semester||Summer break||Winter semester|
|Epiphany/Hilary trimester||Trinity trimester with summer break||Michaelmas trimester|
Holidays[edit | edit source]
The Christian holidays are fixed as follows: Carnival, Easter and Pentecost are at month boundaries, 7 weeks apart. Christmas Eve is one week before New Year’s Eve unless there’s a leap week and Lady Day is 40 weeks before Christmas (not 9 months).
Note that Halloween is on -6-6-6, a Saturday. Most holidays are conveniently placed onto Sundays, unless they are already associated with a fixed day of the week.
|New Year||-1-1-1||the first day of Monmonth|
|Circumcision of Christ||-1-1-1||the first day of Monmonth|
|Epiphany||-1-1-7||was 6 Jan or Sunday close by, also Theophany|
|Candlemas||-1-4-7||was 2 Feb or Sunday close to it, Presentation of Jesus at the Temple|
|Valentine’s Day||-1-6-7||was 14 Feb|
|Shrove Monday||-2-1-1||the first day of Tuesmonth, 7 weeks before Easter||Carnival|
|Women’s Day||-2-2-7||was 8 Mar|
|Lady Day||-2-3-7||was 25 Mar, Feast of the Annunciation of the Blessed Virgin|
|Easter Sunday||-2-7-7||the last day of Tuesmonth (a week later than proposed for Sym454)|
|Easter Monday||-3-1-1||the first day of Wednesmonth|
|Labor Day||-3-3-3||-3-3-1? -3-7-5?, Workers’ Day was 1 May (or 1st Mon in Sep in NA)|
|Mother’s Day||-3-3-7||was 2nd Sun in May etc.pp.|
|Father’s Day||-3-4-7||was 3rd Sun in Jun etc.pp.|
|Ascension||-3-7-4||40 days after Easter||Pentecost|
|Pentecost Sunday||-3-8-7||the last day of Wednesmonth, 7 weeks after Easter|
|Pentecost Monday||-4-1-1||the first day of Thursmonth, Our Lady of Holy Church|
|Corpus Christi||-4-2-4||60 days after Easter|
|Midsummer||-4-2-7||was ca. 21 Jun|
|Feast of the Transfiguration||-4-7-7||the last day of Thursmonth, was 6 Aug|
|Feast of the Cross||-5-8-7||the last day of Frimonth, was 14 Sep|
|Michaelmas||-6-1-7||was 29 Sep, Feast of the Archangels|
|Halloween||-6-6-6||a Saturday, was 31 Oct, Samhain||All Hallows|
|All Hallows||-6-6-7||was 1 Nov|
|All Saints||-6-7-7||the last day of Saturmonth|
|Thanksgiving||-7-1-7||Harvest feast, was 4th Thu in Nov, 2nd Mon in Oct, 1st Sun in Oct etc.pp.|
|1st Advent Sunday||-7-2-7||Advent|
|St. Nicklas||-7-3-6||was 6 Dec|
|2nd Advent Sunday||-7-3-7|
|3rd Advent Sunday||-7-4-7|
|4th Advent Sunday||-7-5-7|
|Christmas Day||-7-6-7||was 25 Dec|
|Boxing Day||-7-7-1||was 26 Dec|
|New Year’s Eve||-7-7/8-7||depends on leap week|