HttpCookie.Expire timezone implications?

Question

I'm trying to write cookies from my website and I'm trying to figure out what implications timezones has over the HttpCookie.Expire property. Should I be passing DateTime.Now.AddDays(1) or DateTime.UtcNow.AddDays(1) or the users's timezone plus a day?

Answer 1

If you use a local time, .NET will automatically convert it to GMT when outputting it to the client.

So it doesn't matter for the cookie, but I do suggest to always work with UTC, so at least you can assume that in your data the timezone offset is always 0.