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using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
public class TZDTest {
static TimeZoneInfo _timeZoneInstance;
static string _timeZone;
public static void Main (String [] args)
{
var local = TimeZoneInfo.Local;
Console.WriteLine($"TimeZone: {local}");
var dt = DateTime.Now;
Console.WriteLine($"DateLocal: {dt}");
var utc = DateTime.UtcNow;
Console.WriteLine($"DateUTC: {utc}");
Console.WriteLine($"GetUserTime: {GetUserTime()}");
Console.WriteLine($"GetUtcUserTime: {GetUtcUserTime(dt)}");
DateTime localDate = DateTime.Now;
DateTime utcDate = DateTime.UtcNow;
String[] cultureNames = { "en-US", "en-GB", "fr-FR",
"de-DE", "ru-RU" } ;
foreach (var cultureName in cultureNames) {
var culture = new CultureInfo(cultureName);
Console.WriteLine("{0}:", culture.NativeName);
Console.WriteLine(" Local date and time: {0}, {1:G}",
localDate.ToString(culture), localDate.Kind);
Console.WriteLine(" UTC date and time: {0}, {1:G}\n",
utcDate.ToString(culture), utcDate.Kind);
}
var tzd = TimeZoneInfo.FindSystemTimeZoneById("US/Eastern");
Console.WriteLine($"TimeZone: {tzd}");
Console.WriteLine($"TimeZone: {TimeZoneInfo.FindSystemTimeZoneById("Pacific/Honolulu")}");
var tzs = TimeZoneInfo.GetSystemTimeZones();
foreach(var tzi in tzs)
{
Console.WriteLine(tzi);
}
}
/// <summary>
/// Returns a UTC time in the user's specified timezone.
/// </summary>
/// <param name="utcTime">The utc time to convert</param>
/// <param name="timeZoneName">Name of the timezone (Eastern Standard Time)</param>
/// <returns>New local time</returns>
public static DateTime GetUserTime(DateTime? utcTime = null)
{
if (utcTime == null)
utcTime = DateTime.UtcNow;
return TimeZoneInfo.ConvertTimeFromUtc(utcTime.Value, TimeZoneInstance);
}
/// <summary>
/// Converts local server time to the user's timezone and
/// returns the UTC date.
///
/// Use this to convert user captured date inputs and convert
/// them to UTC.
///
/// User input (their local time) comes in as local server time
/// -> convert to user's timezone from server time
/// -> convert to UTC
/// </summary>
/// <param name="localServerTime"></param>
/// <returns></returns>
public static DateTime GetUtcUserTime(DateTime? localServerTime)
{
if (localServerTime == null)
localServerTime = DateTime.Now;
return TimeZoneInfo.ConvertTime(localServerTime.Value, TimeZoneInstance).ToUniversalTime();
}
/// <summary>
/// The users TimeZone using .NET TimeZoneNames
/// </summary>
public static string TimeZone
{
get { return _timeZone; }
set
{
TimeZoneInstance = null;
_timeZone = value;
}
}
public static TimeZoneInfo TimeZoneInstance
{
get
{
if (_timeZoneInstance == null)
{
try
{
_timeZoneInstance = TimeZoneInfo.FindSystemTimeZoneById(TimeZone);
}
catch
{
TimeZone = "Pacific/Honolulu";
_timeZoneInstance = TimeZoneInfo.FindSystemTimeZoneById(TimeZone);
}
}
return _timeZoneInstance;
}
private set { _timeZoneInstance = value; }
}
}
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