December, 2003, week #50: first day's date: dec, 7, 2003 last day's date: dec, 13, 2003 December, 2003, week #51: first day's date: dec, 14, 2003 last day's date: dec, 20, 2003 December, 2003, week #52: first day's date: dec, 21, 2003 last day's date: dec, 27, 2003 December, 2003, week #01: first day's date: dec, 28, 2003 (this week is split between two months, and years) Last day's date: jan, 03, 2004 January , 2004, week #01: first day's date: dec, 28, 2003 (see example above) Last day's date: jan, 03, 2004 January , 2004, week #02: first day's date: jan, 04, 2003 Last day's date: jan, 10, 2004Note: To determine the number of a week, given a date, I'm using: nWeek = Week (dGivenDate, 1, 1) (First week contains January 1st, first day of week is Sunday).