public DateTime GetLocalDateTime(string microSiteId)
{
var citydatetime = DateTime.Now;
if (microSiteId == "london" || microSiteId == "international")
{
return(DateTime.Now);
}
const string timeZonesCacheKey = "TimeZones";
var timeZoneList = _cacheProvider.GetFromCache <Dictionary <string, TimeZoneInformation> >(timeZonesCacheKey);
if (timeZoneList == null)
{
//read and populate time zones from the registry
var mZones = TimeZoneInformation.EnumZones();
Array.Sort(mZones, new TimeZoneComparer());
timeZoneList = new Dictionary <string, TimeZoneInformation>();
foreach (var tzone in mZones)
{
if (!timeZoneList.ContainsKey(tzone.Name))
{
timeZoneList.Add(tzone.Name, tzone);
}
}
//cache this for 5 mins
if (timeZoneList.Count > 0)
{
_cacheProvider.AddToCache(timeZonesCacheKey, timeZoneList, DateTime.Now.AddDays(1));
}
}
var tzsn = GetCityTimeZoneStandardName(microSiteId);
if (!timeZoneList.ContainsKey(tzsn))
{
return(citydatetime);
}
var destinationTimeZoneInfo = timeZoneList[tzsn];
var local = DateTime.Now;
var utc = local.ToUniversalTime();
if (destinationTimeZoneInfo == null)
{
return(citydatetime);
}
var destinationTime = destinationTimeZoneInfo.FromUniversalTime(utc);
citydatetime = destinationTime;
return(citydatetime);
}
protected void Page_Init(object sender, EventArgs e)
{
if (!IsPostBack)
{
TimeZoneInformation[] zones = TimeZoneInformation.EnumZones();
selectTimezoneControl.Items.Add(new ListItem("Web Browser TimeZone", "-1"));
foreach (TimeZoneInformation tz in zones)
{
selectTimezoneControl.Items.Add(new ListItem(tz.DisplayName, tz.Index.ToString()));
}
}
}
public void TestTryParseTimezoneOffsetToTimeSpan()
{
TimeZoneInformation[] tzs = TimeZoneInformation.EnumZones();
foreach (TimeZoneInformation ti in tzs)
{
string tz = ti.CurrentUtcBiasString;
TimeSpan span = TimeSpan.Zero;
Assert.IsTrue(TimeZoneInformation.TryParseTimezoneOffsetToTimeSpan(tz, out span),
string.Format("Error parsing {0}", tz));
Console.WriteLine("{0}: {1} - {2}", ti.DisplayName, tz, span);
Assert.AreEqual(span, ti.CurrentUtcBias);
}
}
public void TestKnownTimeZones()
{
int previousHours = 14;
TimeZoneInformation[] tzs = TimeZoneInformation.EnumZones();
foreach (TimeZoneInformation ti in tzs)
{
Assert.IsTrue(ti.CurrentUtcBias.Minutes == 0 ||
Math.Abs(ti.CurrentUtcBias.Minutes) == 30 ||
Math.Abs(ti.CurrentUtcBias.Minutes) == 45,
string.Format("Minutes = {0}", ti.CurrentUtcBias.Minutes));
Console.WriteLine("{0}: {1}", ti.DisplayName, ti.CurrentUtcBias);
Assert.IsTrue(ti.CurrentUtcBias.Hours <= 13 && ti.CurrentUtcBias.Hours >= -12);
Assert.IsTrue(previousHours + 1 >= ti.CurrentUtcBias.Hours); // adjust an extra hour for daylight savings
previousHours = ti.CurrentUtcBias.Hours;
}
}
