Dates With Fixed Week Number
For all years, 8 days have a fixed ISO week number (between 01 and 08) in January and February. And with the exception of leap years starting on Thursday, dates with fixed week numbers occurs on all months of the year (for 1 day of each ISO week 01 to 52) :
| Month | Dates | Week numbers |
|---|---|---|
| January | 4, 11, 18, 25 | 01-04 |
| February | 1, 8, 15, 22 | 05-08 |
| March | 1, 8, 15, 22, 29 | 09-13 |
| April | 5, 12, 19, 26 | 14-17 |
| May | 3, 10, 17, 24, 31 | 18-22 |
| June | 7, 14, 21, 28 | 23-26 |
| July | 5, 12, 19, 26 | 27-30 |
| August | 2, 9, 16, 23, 30 | 31-35 |
| September | 6, 13, 20, 27 | 36-39 |
| October | 4, 11, 18, 25 | 40-43 |
| November | 1, 8, 15, 22, 29 | 44-48 |
| December | 6, 13, 20, 27 | 49-52 |
During leap years starting on Thursday (i.e. the 13 years number 004, 032, 060, 088, 128, 156, 184, 224, 252, 280, 320, 348, 376 in a 400-year cycle), the ISO week numbers are incremented by 1 from March to the rest of the year (this last occurred in 1976 and 2004 and will not occur before 2032; these exceptions are happening between years that are most often 28 years apart, or 40 years apart for 3 pairs of successive years: from year 088 to 128, from year 184 to 224, and from year 280 to 320).
The day of the week for these days are related to Doomsday because for any year, the Doomsday is the day of the week that the last day of February falls on. These dates are one day after the Doomsdays, except that in January and February of leap years the dates themselves are Doomsdays. In leap years the week number is the rank number of its Doomsday.
Read more about this topic: ISO Week Date, Relation With The Gregorian Calendar
Famous quotes containing the words dates, fixed, week and/or number:
“What is most interesting and valuable in it, however, is not the materials for the history of Pontiac, or Braddock, or the Northwest, which it furnishes; not the annals of the country, but the natural facts, or perennials, which are ever without date. When out of history the truth shall be extracted, it will have shed its dates like withered leaves.”
—Henry David Thoreau (1817–1862)
“...a fixed aim furnishes us with a fixed measure, by which we can decide whether such or such an action proposed is worth trying for or not, and as aims must vary with the individual, the decisions of any two people as to the desirableness of an action may not be the same.”
—Anna C. Brackett (1836–1911)
“Pray be always in motion. Early in the morning go and see things; and the rest of the day go and see people. If you stay but a week at a place, and that an insignificant one, see, however, all that is to be seen there; know as many people, and get into as many houses as ever you can.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)
“Even in ordinary speech we call a person unreasonable whose outlook is narrow, who is conscious of one thing only at a time, and who is consequently the prey of his own caprice, whilst we describe a person as reasonable whose outlook is comprehensive, who is capable of looking at more than one side of a question and of grasping a number of details as parts of a whole.”
—G. Dawes Hicks (1862–1941)