Why is there no DateTime.AddWeeks(), and how can I get a DateTime object for 52 weeks ago?

user_181771 0
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The System.DateTime object has methods to AddYears(), AddMonths(), AddDays(), AddSeconds(), etc.

I've noticed that there is no AddWeeks(). Why is this?

Also, my requirement is to get a price value from 52 weeks ago. I know this equates to 1 year, but they were specific about 52 weeks.

Would it be the same for me to do:

yearOldPrice = _priceService.GetPriceForDate(price.Date.AddYears(-1));

as

yearOldPrice = _priceService.GetPriceForDate(price.Date.AddDays(-7 * 52));

I ask on the presumption that .AddDays(-7 * 52) is the same as .AddWeeks(-52), 'cause there's 7 days in a week.

datetime c#
9 Answers

As @Craig said: In Powershell you could solve it like this:

[int]$WeeksAgo = 52

(Get-Date).AddDays(-7 * $WeeksAgo)
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