Get Timezone offset from Country and State Name in C#

Question

Is there a way in C# to get the timezone offset for a given Country and State? For example, if input is Country - "Canada" and State - "Saskatchewan", then output is "-06:00"?

Does this help you? https://stackoverflow.com/questions/19695439/get-the-default-timezone-for-a-country-via-cultureinfo — Damian, Mar 15 '21 at 08:21
Thanks for your quick response, but I have already gone through this answer. It requires zone id information. I just have Country name and State Name. — vidhi, Mar 15 '21 at 08:27
@vidhi Canada/Saskatchewan is a valid TZ database timezone name. — ProgrammingLlama, Mar 15 '21 at 08:33
I think I misinterpreted the answer. It did help in finding the zone ids of different countries. Is there a way to find out the time offset from the zone id? — vidhi, Mar 15 '21 at 11:21

score 0 · Answer 1 · edited Apr 03 '21 at 03:57

As mentioned in the comments, modify the SO question's code like below to get latitude and longitude:

IEnumerable<string> zoneIds = TzdbDateTimeZoneSource.Default.ZoneLocations
    .Where(x => x.CountryCode == countryCode)
    .Select(x => new { x.Latitude, x.Longitude});

Then, one way is to use Azure Maps API to fetch Offset and Transition offsets:

GET https://atlas.microsoft.com/timezone/byCoordinates/json?subscription-key=[subscription-key]&api-version=1.0&options=all&query=47.0,-122

Sample response:

{
  "Version": "2019a",
  "ReferenceUtcTimestamp": "2019-06-17T22:16:59.0765556Z",
  "TimeZones": [
    {
      "Id": "America/Los_Angeles",
      "Aliases": [
        "US/Pacific",
        "US/Pacific-New"
      ],
      "Countries": [
        {
          "Name": "United States",
          "Code": "US"
        }
      ],
      "Names": {
        "ISO6391LanguageCode": "en",
        "Generic": "Pacific Time",
        "Standard": "Pacific Standard Time",
        "Daylight": "Pacific Daylight Time"
      },
      "ReferenceTime": {
        "Tag": "PDT",
        "StandardOffset": "-08:00:00",
        "DaylightSavings": "01:00:00",
        "WallTime": "2019-06-17T15:16:59.0765556-07:00",
        "PosixTzValidYear": 2019,
        "PosixTz": "PST+8PDT,M3.2.0,M11.1.0",
        "Sunrise": "2019-06-17T05:12:21.267-07:00",
        "Sunset": "2019-06-17T21:05:18.017-07:00"
      },
      "RepresentativePoint": {
        "Latitude": 34.05222222222222,
        "Longitude": -118.24277777777778
      },
      "TimeTransitions": [
        {
          "Tag": "PDT",
          "StandardOffset": "-08:00:00",
          "DaylightSavings": "01:00:00",
          "UtcStart": "2019-03-10T10:00:00Z",
          "UtcEnd": "2019-11-03T09:00:00Z"
        },
        {
          "Tag": "PST",
          "StandardOffset": "-08:00:00",
          "DaylightSavings": "00:00:00",
          "UtcStart": "2019-11-03T09:00:00Z",
          "UtcEnd": "2020-03-08T10:00:00Z"
        },
        {
          "Tag": "PDT",
          "StandardOffset": "-08:00:00",
          "DaylightSavings": "01:00:00",
          "UtcStart": "2020-03-08T10:00:00Z",
          "UtcEnd": "2020-11-01T09:00:00Z"
        }
      ]
    }
  ]
}

Secondly, you can use Google APIs to get Local time using latitude and longitude:

    {
      "Version": "2019a",
      "ReferenceUtcTimestamp": "2019-06-17T22:16:59.0765556Z",
      "TimeZones": [
        {
          "Id": "America/Los_Angeles",
          "Aliases": [
            "US/Pacific",
            "US/Pacific-New"
          ],
          "Countries": [
            {
              "Name": "United States",
              "Code": "US"
            }
          ],
          "Names": {
            "ISO6391LanguageCode": "en",
            "Generic": "Pacific Time",
            "Standard": "Pacific Standard Time",
            "Daylight": "Pacific Daylight Time"
          },
          "ReferenceTime": {
            "Tag": "PDT",
            "StandardOffset": "-08:00:00",
            "DaylightSavings": "01:00:00",
            "WallTime": "2019-06-17T15:16:59.0765556-07:00",
            "PosixTzValidYear": 2019,
            "PosixTz": "PST+8PDT,M3.2.0,M11.1.0",
            "Sunrise": "2019-06-17T05:12:21.267-07:00",
            "Sunset": "2019-06-17T21:05:18.017-07:00"
          },
          "RepresentativePoint": {
            "Latitude": 34.05222222222222,
            "Longitude": -118.24277777777778
          },
          "TimeTransitions": [
            {
              "Tag": "PDT",
              "StandardOffset": "-08:00:00",
              "DaylightSavings": "01:00:00",
              "UtcStart": "2019-03-10T10:00:00Z",
              "UtcEnd": "2019-11-03T09:00:00Z"
            },
            {
              "Tag": "PST",
              "StandardOffset": "-08:00:00",
              "DaylightSavings": "00:00:00",
              "UtcStart": "2019-11-03T09:00:00Z",
              "UtcEnd": "2020-03-08T10:00:00Z"
            },
            {
              "Tag": "PDT",
              "StandardOffset": "-08:00:00",
              "DaylightSavings": "01:00:00",
              "UtcStart": "2020-03-08T10:00:00Z",
              "UtcEnd": "2020-11-01T09:00:00Z"
            }
          ]
        }
      ]
    }

Get Timezone offset from Country and State Name in C#

1 Answers1