What was the date 180 days ago?

Question

How would I get the date 180 days ago using C#?

score 55 · Accepted Answer · answered Feb 23 '10 at 16:07

55

DateTime oneEightyAgo = DateTime.Today.AddDays(-180);

answered Feb 23 '10 at 16:07

sidney.andrews

5

I would use DateTime.Today as opposed to DateTime.Now because Today is just the date with 00:00 as the time, and now is the moment in time down to the millisecond – sidney.andrews Feb 23 '10 at 16:08
2

This is probably the most insightful answer I've seen yet on SO - cheers – James Kolpack Feb 23 '10 at 16:11
1

Thanks, the whole DateTime.Today and DateTime.Now is a sticking point for me, especially in code review. It's the whole concept of doing it the right way as opposed to a solution that happens to work (Programming by Coincidence - The Pragmatic Programmer) – sidney.andrews Feb 23 '10 at 16:13

Joel Etherton · Answer 2 · 2010-02-23T16:18:08.843

9

EDIT:

DateTime day180 = Date.Now.AddDays(-180);

It's important to put it into a separate variable otherwise the value will be lost.

edited Feb 23 '10 at 16:18

answered Feb 23 '10 at 16:07

Joel Etherton

7

Pretty sure he doesn't want to know what the date was 180 **months** ago. ;) – technophile Feb 23 '10 at 16:08
1

He wants days back, not months back. – Steven Feb 23 '10 at 16:09

score 7 · Answer 3 · answered Feb 23 '10 at 16:21

7

DateTime oneEightyAgo = DateTime.Now.ToUniversalTime().AddDays(-180);

Its best to record UTC...

answered Feb 23 '10 at 16:21

Brian Leahy

score 6 · Answer 4 · answered Feb 23 '10 at 16:06

6

DateTime.Now.AddDays(-180)

answered Feb 23 '10 at 16:06

zincorp

score 4 · Answer 5 · answered Feb 23 '10 at 16:07

4

DateTime.Now.AddDays(-180)

answered Feb 23 '10 at 16:07

tbreffni

5 Answers5