This code determines the date of the **last Friday** of...

This code determines the date of the last Friday of the previous or current week, adjusting for cases where the calculated Friday falls in the prior month.

Here’s a step-by-step breakdown of what it does:

1. var lastFriday = lastDay.AddDays(-(int)lastDay.DayOfWeek - 2);

• lastDay: This variable represents some date (its value would have been set earlier in the code).
• (int)lastDay.DayOfWeek: This converts the DayOfWeek of lastDay (0 = Sunday, 1 = Monday, ..., 6 = Saturday) into an integer.
• -(int)lastDay.DayOfWeek - 2: This calculates how many days to subtract from lastDay to get to the previous Friday.
  • Subtract (int)lastDay.DayOfWeek to go back to the start of the week (Sunday).
  • Subtract an additional 2 days to end up on Friday.

So, this line computes the closest previous Friday relative to the given lastDay.

2. if (lastFriday.Month != now.Month)

This checks whether the calculated lastFriday falls in a different month compared to the now date (assumed to represent the current date).

3. { lastFriday = lastFriday.AddDays(7); }

If lastFriday is in a different month from the current now month, then 7 days are added to lastFriday to move it forward by one week. This adjustment ensures the lastFriday date remains within the same month as now.

What does this code accomplish overall?

It calculates the most recent Friday relative to the current date (now) or the date specified by lastDay. If the computed Friday falls in the previous month, it adjusts the date to the next Friday to ensure the result is within the same month as now.