The notes are only temporary but can you print this page together
with the notes.
Calculate day and week number for a given date
Background about ISO 8601
ISO 8601 defines the Week as always starting with Monday. The
first week is the week which contains the first Thursday of the
calendar year. This implies that it is the week which is mostly
within the Calendar year and the week containing January 4th.
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your PC just by saving this html page.
© Guido Socher, License: GPL,
guidosocher at gmail.com,
Version: 2009-11-13