任何人都可以建议我有什么方法可以检测英国、德国和法国的国家明智时间。我不确定，但我们能否从 datetime UTC 时间中提取国家/地区时间 DateTime.UtcNow ?
请告诉我，因为我处于用户可以从任何国家/地区登录我们的网站的情况，我需要根据他所在国家/地区的当前时间在下拉列表中显示时间。
另一个人这样做了，但我不确定我是否应该遵循他的方法。这是网址
http://www.c-sharpcorner.com/Blogs/7096/
private string GetCountryTime(string country)
{
DateTime gmt = default(DateTime);
System.DateTime value = default(System.DateTime);
gmt = DateTime.Now.AddMinutes(-330);
switch (country)
{
case "India":
case "Sri Lanka":
return DateTime.Now.ToString();
case "United Kingdom":
case "Portugal":
case "Sierra Leone":
case "Senegal":
case "Morocco":
case "Mali":
return gmt.ToString();
case "France":
case "Spain":
case "Slovenia":
case "Slovakia":
case "Poland":
case "Nigeria":
case "Niger":
case "Hungary":
case "Denmark":
case "Czech Republic":
return gmt.AddMinutes(60).ToString();
case "Botswana":
case "Moldova":
case "South Africa":
case "Malawi":
case "Lithuania":
case "Libya":
case "Turkey":
case "Finland":
case "Egypt":
return gmt.AddMinutes(120).ToString(); ;
case "Bahrain":
case "Somalia":
case "Saudi Arabia":
case "Russia":
case "Qatar":
case "Sudan":
case "Madagascar":
case "Iraq":
return gmt.AddMinutes(180).ToString();
case "Iran":
return gmt.AddMinutes(220).ToString();
case "Armenia":
case "Seychelles":
case "Reunion":
case "Oman":
case "Mauritius":
case "United Arab Emirates":
case "Georgia":
case "Azerbaijan":
return gmt.AddMinutes(240).ToString();
case "Afghanistan":
return gmt.AddMinutes(270).ToString();
case "Pakistan":
case "Maldives":
case "Kyrgyzstan":
return gmt.AddMinutes(300).ToString();
case "Nepal":
return gmt.AddMinutes(345).ToString();
case "Bangladesh":
case "Kazakhstan":
return gmt.AddMinutes(360).ToString();
case "Myanmar":
return gmt.AddMinutes(390).ToString();
case "Cambodia":
case "Laos":
return gmt.AddMinutes(420).ToString();
case "Philippines":
case "Malaysia":
case "Hong Kong":
case "China":
return gmt.AddMinutes(480).ToString();
case "Japan":
case "Korea":
return gmt.AddMinutes(540).ToString();
case "Micronesia":
return gmt.AddMinutes(720).ToString();
case "Papua New Guinea":
case "Australia":
return gmt.AddMinutes(600).ToString();
case "New Caledonia":
return gmt.AddMinutes(660).ToString();
case "New Zealand":
case "Fiji":
return gmt.AddMinutes(720).ToString();
case "Argentina":
case "Brazil":
return gmt.AddMinutes(-180).ToString();
case "Cuba":
return gmt.AddMinutes(-300).ToString();
case "Aruba":
case "Paraguay":
case "Netherlands Antilles":
case "Barbados":
case "Chile":
case "Dominican Republic":
case "Guyana":
return gmt.AddMinutes(-240).ToString();
case "Bahamas":
return gmt.AddMinutes(-240).ToString();
case "Peru":
case "Panama":
case "Jamaica":
case "Haiti":
case "Colombia":
case "Canary Islands":
return gmt.AddMinutes(-300).ToString();
case "Bhutan":
return gmt.AddMinutes(360).ToString();
case "Belize":
case "Mexico":
case "Honduras":
case "Canada":
return gmt.AddMinutes(-360).ToString();
case "Nicaragua":
return gmt.AddMinutes(-300).ToString();
case "United States Of America":
return gmt.AddMinutes(-480).ToString();
case "French Polynesia":
return gmt.AddMinutes(720).ToString();
case "Samoa":
return gmt.AddMinutes(-660).ToString();
case "Singapore":
return gmt.AddMinutes(480).ToString();
case "Slovak Republic":
return gmt.AddMinutes(60).ToString();
case "Solomon Islands":
return gmt.AddMinutes(660).ToString();
case "St Helena":
return gmt.AddMinutes(0).ToString();
case "St Kitts & Nevia":
return gmt.AddMinutes(-240).ToString();
case "St Lucia":
return gmt.AddMinutes(-240).ToString();
case "Surinam":
return gmt.AddMinutes(-180).ToString();
case "Swaziland":
return gmt.AddMinutes(120).ToString();
case "Sweden":
return gmt.AddMinutes(60).ToString();
case "Switzerland":
return gmt.AddMinutes(60).ToString();
case "Syria":
return gmt.AddMinutes(120).ToString();
case "Taiwan":
return gmt.AddMinutes(480).ToString();
case "Tajikistan":
return gmt.AddMinutes(300).ToString();
case "Tanzania":
return gmt.AddMinutes(180).ToString();
case "Thailand":
return gmt.AddMinutes(420).ToString();
case "Tonga":
return gmt.AddMinutes(0).ToString();
case "Trinidad & Tobago":
return gmt.AddMinutes(-240).ToString();
case "Tunisia":
return gmt.AddMinutes(60).ToString();
case "Turkmenistan":
return gmt.AddMinutes(300).ToString();
case "Turks & Caicos Islands":
return gmt.AddMinutes(-240).ToString();
case "Tuvalu":
return gmt.AddMinutes(720).ToString();
case "Uganda":
return gmt.AddMinutes(180).ToString();
case "Ukraine":
return gmt.AddMinutes(120).ToString();
case "Uruguay":
return gmt.AddMinutes(-180).ToString();
case "USA":
return gmt.AddMinutes(-480).ToString();
case "Uzbekistan":
return gmt.AddMinutes(300).ToString();
case "Vanuatu":
return gmt.AddMinutes(660).ToString();
case "Venezuela":
return gmt.AddMinutes(-240).ToString();
case "Vietnam":
return gmt.AddMinutes(420).ToString();
case "Wallis & Futuna Islands":
return gmt.AddMinutes(720).ToString();
case "Yemen":
return gmt.AddMinutes(180).ToString();
case "Zambia":
return gmt.AddMinutes(120).ToString();
case "Zimbabwe":
return gmt.AddMinutes(120).ToString();
default:
return "";
}
}
谢谢
编辑
客户端代码
经过大量搜索后，我得到了解决方案。我可以将用户 pc 时区保存在 cookie 中，并从服务器端访问该 cookie 时区，然后我可以从那里获取用户 pc 日期和时间。但存在一种风险，即用户可能会将他们的时区更改为不同的时区。
$(function(){
setTimezoneCookie();
});
function setTimezoneCookie(){
var timezone_cookie = "timezoneoffset";
// if the timezone cookie not exists create one.
if (!$.cookie(timezone_cookie)) {
// check if the browser supports cookie
var test_cookie = 'test cookie';
$.cookie(test_cookie, true);
// browser supports cookie
if ($.cookie(test_cookie)) {
// delete the test cookie
$.cookie(test_cookie, null);
// create a new cookie
$.cookie(timezone_cookie, new Date().getTimezoneOffset());
// re-load the page
location.reload();
}
}
// if the current timezone and the one stored in cookie are different
// then store the new timezone in the cookie and refresh the page.
else {
var storedOffset = parseInt($.cookie(timezone_cookie));
var currentOffset = new Date().getTimezoneOffset();
// user may have changed the timezone
if (storedOffset !== currentOffset) {
$.cookie(timezone_cookie, new Date().getTimezoneOffset());
location.reload();
}
}
}
server side code
--------------------
public class BaseController : Controller
{
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (HttpContext.Request.Cookies.AllKeys.Contains("timezoneoffset"))
{
Session["timezoneoffset"] =
HttpContext.Request.Cookies["timezoneoffset"].Value;
}
base.OnActionExecuting(filterContext);
}
}
public static string ToClientTime(this DateTime dt)
{
// read the value from session
var timeOffSet = HttpContext.Current.Session["timezoneoffset"];
if (timeOffSet != null)
{
var offset = int.Parse(timeOffSet.ToString());
dt = dt.AddMinutes(-1 * offset);
return dt.ToString();
}
// if there is no offset in session return the datetime in server timezone
return dt.ToLocalTime().ToString();
}
完成此任务的另一种方法
function getTimezoneName() {
tmSummer = new Date(Date.UTC(2005, 6, 30, 0, 0, 0, 0));
so = -1 * tmSummer.getTimezoneOffset();
tmWinter = new Date(Date.UTC(2005, 12, 30, 0, 0, 0, 0));
wo = -1 * tmWinter.getTimezoneOffset();
if (-660 == so && -660 == wo) return 'Pacific/Midway';
if (-600 == so && -600 == wo) return 'Pacific/Tahiti';
if (-570 == so && -570 == wo) return 'Pacific/Marquesas';
if (-540 == so && -600 == wo) return 'America/Adak';
if (-540 == so && -540 == wo) return 'Pacific/Gambier';
if (-480 == so && -540 == wo) return 'US/Alaska';
if (-480 == so && -480 == wo) return 'Pacific/Pitcairn';
if (-420 == so && -480 == wo) return 'US/Pacific';
if (-420 == so && -420 == wo) return 'US/Arizona';
if (-360 == so && -420 == wo) return 'US/Mountain';
if (-360 == so && -360 == wo) return 'America/Guatemala';
if (-360 == so && -300 == wo) return 'Pacific/Easter';
if (-300 == so && -360 == wo) return 'US/Central';
if (-300 == so && -300 == wo) return 'America/Bogota';
if (-240 == so && -300 == wo) return 'US/Eastern';
if (-240 == so && -240 == wo) return 'America/Caracas';
if (-240 == so && -180 == wo) return 'America/Santiago';
if (-180 == so && -240 == wo) return 'Canada/Atlantic';
if (-180 == so && -180 == wo) return 'America/Montevideo';
if (-180 == so && -120 == wo) return 'America/Sao_Paulo';
if (-150 == so && -210 == wo) return 'America/St_Johns';
if (-120 == so && -180 == wo) return 'America/Godthab';
if (-120 == so && -120 == wo) return 'America/Noronha';
if (-60 == so && -60 == wo) return 'Atlantic/Cape_Verde';
if (0 == so && -60 == wo) return 'Atlantic/Azores';
if (0 == so && 0 == wo) return 'Africa/Casablanca';
if (60 == so && 0 == wo) return 'Europe/London';
if (60 == so && 60 == wo) return 'Africa/Algiers';
if (60 == so && 120 == wo) return 'Africa/Windhoek';
if (120 == so && 60 == wo) return 'Europe/Amsterdam';
if (120 == so && 120 == wo) return 'Africa/Harare';
if (180 == so && 120 == wo) return 'Europe/Athens';
if (180 == so && 180 == wo) return 'Africa/Nairobi';
if (240 == so && 180 == wo) return 'Europe/Moscow';
if (240 == so && 240 == wo) return 'Asia/Dubai';
if (270 == so && 210 == wo) return 'Asia/Tehran';
if (270 == so && 270 == wo) return 'Asia/Kabul';
if (300 == so && 240 == wo) return 'Asia/Baku';
if (300 == so && 300 == wo) return 'Asia/Karachi';
if (330 == so && 330 == wo) return 'Asia/Calcutta';
if (345 == so && 345 == wo) return 'Asia/Katmandu';
if (360 == so && 300 == wo) return 'Asia/Yekaterinburg';
if (360 == so && 360 == wo) return 'Asia/Colombo';
if (390 == so && 390 == wo) return 'Asia/Rangoon';
if (420 == so && 360 == wo) return 'Asia/Almaty';
if (420 == so && 420 == wo) return 'Asia/Bangkok';
if (480 == so && 420 == wo) return 'Asia/Krasnoyarsk';
if (480 == so && 480 == wo) return 'Australia/Perth';
if (540 == so && 480 == wo) return 'Asia/Irkutsk';
if (540 == so && 540 == wo) return 'Asia/Tokyo';
if (570 == so && 570 == wo) return 'Australia/Darwin';
if (570 == so && 630 == wo) return 'Australia/Adelaide';
if (600 == so && 540 == wo) return 'Asia/Yakutsk';
if (600 == so && 600 == wo) return 'Australia/Brisbane';
if (600 == so && 660 == wo) return 'Australia/Sydney';
if (630 == so && 660 == wo) return 'Australia/Lord_Howe';
if (660 == so && 600 == wo) return 'Asia/Vladivostok';
if (660 == so && 660 == wo) return 'Pacific/Guadalcanal';
if (690 == so && 690 == wo) return 'Pacific/Norfolk';
if (720 == so && 660 == wo) return 'Asia/Magadan';
if (720 == so && 720 == wo) return 'Pacific/Fiji';
if (720 == so && 780 == wo) return 'Pacific/Auckland';
if (765 == so && 825 == wo) return 'Pacific/Chatham';
if (780 == so && 780 == wo) return 'Pacific/Enderbury'
if (840 == so && 840 == wo) return 'Pacific/Kiritimati';
return 'US/Pacific';
}
最佳答案
不要遵循该代码。这是可怕的代码，比我现在有时间研究的方式更多。
基本上，您需要获取用户所在的时区——这可能需要的不仅仅是国家，因为几个国家跨越多个时区。
如果你想坚持“ Vanilla ”.NET，你可以使用 TimeZoneInfo - 您需要知道用户时区的 ID，此时您可以使用:
var zone = TimeZoneInfo.FindSystemTimeZoneById(zoneId);
var now = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, zone);
另一种选择是使用我的Noda Time库 - 不仅允许您使用 Windows 时区，还可以使用更广泛使用的 IANA/TZDB在我看来，时区......以及总体上提供更好的日期/时间 API。例如，您将使用:
// zoneId is the TZDB ID, e.g. "Europe/London"
DateTimeZone zone = DateTimeZoneProviders.Tzdb[zoneId];
// clock would be an IClock implementation of some description; rather than
// having a static method, an interface encourages testability.
ZonedDateTime now = clock.Now.InZone(zone);
(请注意，在 Noda Time 2.0 中，IClock 接口(interface)发生了一些变化……上面的代码适用于 Noda Time 1.x。)
在这两种情况下，您都需要格式化
DateTime或 ZonedDateTime如果您需要一个字符串 - 您使用的格式很可能是用户特定的。在这两种情况下，您还需要计算出用户的时区，这远非简单。在不知道您正在构建什么样的应用程序的情况下，很难就这方面的事情给您建议。
关于c# - 如何从用户 pc TimeZone 中提取当前日期和时间，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25379517/