In order to be able to fulfil the need to situate cultural products such as the documents of this site in time some kind of chronological system is required. On this planet the earthly solar year is best suited as a unit for a more or less natural chronology. Such a chronology must, then, establish two things:

1. the number of the year.
   For want of something better at present this site counts the number of years after (the first solstice succeeding) the end of the Second World War.
2. the number (and name) of the day of the year.
   For this purpose the present site employs the Quaternary Metric Calendar instead of a historically deformed freak of culture such as the frequently used religious-imperial one.

The following documents, card and diary deal specifically with the new era and the Metric calendar:

• The Year-Week-Day System, the best document to start with
• A Quaternary Metric Calendar in the Book of Symbols
• Automatic conversion from Religious-Imperial to Metric
• Perpetual New Year card
• A Metric Diary for Every-Year Personal Use
  (free from days specially marked for exclusivists)

All TRINPsite text files show two dates, separated by a hyphen, after the site name TRINPsite at the top on the left. The first of these dates is the day on which the document was made public on the Internet, the second the day when the document was last changed, at least as far as the visible text is concerned. The dates are represented by codes consisting of three numbers: 12.34.5. The first number relates to the year, starting from the end of the Second World War; the second and third numbers relate to the week and the day of the week in accordance with the Metric calendar.