Question

I have my own asp.net cookie created like this:

var authTicket = new FormsAuthenticationTicket(
    version,
    userName,
    DateTime.UtcNow,
    DateTime.UtcNow.AddMinutes(30),
    createPersistentCookie,
    userData,
    "/");

string encryptedTicket = FormsAuthentication.Encrypt(authTicket);
var authCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket);

As you can see everything is in UTC time.

When I decrypt it:

var cookie = HttpContext.Current.Request.Cookies.Get(FormsAuthentication.FormsCookieName);

if (cookie != null)
{
    var ticket = FormsAuthentication.Decrypt(cookie.Value);
    return ticket.Expiration.Ticks;
}
else
{
    return 0;
}

It returns local time. So, does it get converted automatically or is it something else? If so how can I get it back to UTC time?

Answer 1

From MSDN:

FormsAuthenticationTicket.Expiration Property

Gets the local date and time at which the forms-authentication ticket expires.

You can use the DateTime.ToUniversalTime method to convert a DateTime to UTC:

return ticket.Expiration.ToUniversalTime().Ticks;