Question

I am using ColdFusion 9.0.1.

I am creating a contest each Monday at midnight. I need to use ColdFusion (but I am sure the logic is the same for other languages) to find the date of the most recent past Monday. Once I determine that date, I will drop that date into a SQL Statement to get the current standings and past results.

So, what functions do I need to find the most recent past Monday?

ANSWER

Dates = structNew();
Dates.CurrentDay = dateFormat(now(), "yyyy-mm-dd");
// LOOP MAX OF SEVEN TIMES
for (i = 1; i lte 7; i++) {
    // IF CURRENT DAY OF WEEK IS MONDAY SET AND BREAK
    if (dayOfWeek(Dates.CurrentDay) == 2) {
        Dates.BikeOfTheWeekDate = Dates.CurrentDay;
        break; 
    // IF CURRENT DAY OF WEEK IS NOT MONDAY SUBTRACT DAY
    } else {
        Dates.CurrentDay = dateAdd("d", -1, Dates.CurrentDay);
    }
}

Answer 1

Pseudocode:

Get the current day
Loop
    Check if it's Monday
        If yes, break out of the loop
    Substract one
Next loop

In ColdFusion, substract one day with DateAdd("d", -1, date) and check for Monday with DayOfWeek(date) which returns 2 for Monday.