使用 JsonConverter 将日期 UTC 转换为特定时区

Question

对不起我的格式。

我收到来自数据库的 JSON 响应，我需要将日期转换为每个用户的时区 he/she。我收到的用户时区为“timezone”：5.5 ，或“时区”：-6.

仅供参考，我的应用程序在 Azure 中运行。我还应该检查时区的夏令时。应用程序是用 c# 开发的。我试过了this and this 看起来 Nodatime 适合根据时区转换日期。我对此完全陌生，并尝试弄清楚如何根据时区更改 JSON 中的日期值。

我已尝试使用以下代码查看日期是否发生变化，但没有任何反应。我不确定我可以把时区放在哪里。感谢任何帮助。

 ` var date = "2020-08-12T18:30:13.000";
    var json = $"{{\"Date\": \"{date}\"}}";

    var pattern = ZonedDateTimePattern.CreateWithInvariantCulture(
        "yyyy-MM-dd HH:mm:ss z",
        DateTimeZoneProviders.Tzdb
    );

    var settings = new JsonSerializerSettings
    {
        DateParseHandling = DateParseHandling.None,
        Converters = { new NodaPatternConverter<ZonedDateTime>(pattern) }
    };
    var dateObj = JsonConvert.DeserializeObject<DateObj>(json, settings);
    Console.WriteLine(dateObj.Date);`

下面是JSON我正在收

{
"entity": [
    {
        "JobId": 691230,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "ArchiveLog",
        " Backup Type": "Full",
        "Start Time": "2020-08-12T18:30:16.000",
        "End Time": "2020-08-12T18:32:04.000",
        "Duration in Mins": 2,
        "Size of Application": 315621376,
        "Job Status": "Completed",
        "dt": "2020-08-12T00:00:00.000",
        "age": 0,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 691230,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "ArchiveLog",
        " Backup Type": "Full",
        "Start Time": "2020-08-12T18:30:16.000",
        "End Time": "2020-08-12T18:32:04.000",
        "Duration in Mins": 2,
        "Size of Application": 315621376,
        "Job Status": "Completed",
        "dt": "2020-08-12T00:00:00.000",
        "age": 0,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 694338,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "ArchiveLog",
        " Backup Type": "Full",
        "Start Time": "2020-08-13T12:30:15.000",
        "End Time": "2020-08-13T12:32:07.000",
        "Duration in Mins": 2,
        "Size of Application": 282066944,
        "Job Status": "Completed",
        "dt": "2020-08-13T00:00:00.000",
        "age": 0,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 693664,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "ArchiveLog",
        " Backup Type": "Full",
        "Start Time": "2020-08-13T06:30:24.000",
        "End Time": "2020-08-13T06:32:13.000",
        "Duration in Mins": 2,
        "Size of Application": 255852544,
        "Job Status": "Completed",
        "dt": "2020-08-13T00:00:00.000",
        "age": 0,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 692966,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Windows File System",
        "Instance": "N/A",
        "BackupSet": "defaultBackupSet",
        "Subclient": "default",
        " Backup Type": "Incremental",
        "Start Time": "2020-08-13T02:00:19.000",
        "End Time": "2020-08-13T04:00:14.000",
        "Duration in Mins": 120,
        "Size of Application": 514155115394,
        "Job Status": "Completed",
        "dt": "2020-08-13T00:00:00.000",
        "age": 0,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 692656,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "ArchiveLog",
        " Backup Type": "Full",
        "Start Time": "2020-08-13T00:30:17.000",
        "End Time": "2020-08-13T00:32:13.000",
        "Duration in Mins": 2,
        "Size of Application": 124780544,
        "Job Status": "Completed",
        "dt": "2020-08-13T00:00:00.000",
        "age": 0,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 691827,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "default",
        " Backup Type": "Incremental",
        "Start Time": "2020-08-12T21:00:24.000",
        "End Time": "2020-08-12T22:51:53.000",
        "Duration in Mins": 111,
        "Size of Application": 683671552,
        "Job Status": "Completed",
        "dt": "2020-08-13T00:00:00.000",
        "age": 1,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    },
    {
        "JobId": 691230,
        "Operation Type": "Backup",
        "Client": "cnwxwdevwms01",
        "Agent": "Oracle Database",
        "Instance": "T0340X",
        "BackupSet": "default",
        "Subclient": "ArchiveLog",
        " Backup Type": "Full",
        "Start Time": "2020-08-12T18:30:16.000",
        "End Time": "2020-08-12T18:32:04.000",
        "Duration in Mins": 2,
        "Size of Application": 315621376,
        "Job Status": "Completed",
        "dt": "2020-08-13T00:00:00.000",
        "age": 1,
        "original_0": {
            "numberOfDays": "10",
            "serverName": "cnwxwdevwms01"
        }
    }
]
}

Answer 1

如果这对你有用，请告诉我。

我没有使用过 Nodatime，因为我认为它不是时区转换所必需的。我看到的问题是您的日期时间不包含任何时区信息。 .Net 将此作为本地处理。正如 Microsoft 文档所述： The time zone component of DateTimeKind.Utc date and time values uses "Z" (which stands for zero offset) to represent UTC.

Edit（根据@Sanjeev Gautam 的评论）：当您的函数在 Azure 上运行时，您需要找到一种方法来提取用户的本地时区。在下面的示例中，我使用了 UTC-9.

指定您的日期时间设置为 UTC 允许您这样做：

// Object Class
class DateObj
{
    public DateTime Date { get; set; }
}


// JsonConverter
class DateTimeConverterTimeZone : JsonConverter<DateTime>
{
    public TimeZoneInfo TimeZone { get; set; }

    public DateTimeConverterTimeZone(TimeZoneInfo timezone)
    {
        TimeZone = timezone;
    }

    public override void WriteJson(JsonWriter writer, DateTime value, JsonSerializer serializer)
    {
        writer.WriteValue(value.ToUniversalTime());
    }

    public override DateTime ReadJson(JsonReader reader, Type objectType, DateTime existingValue, bool hasExistingValue, JsonSerializer serializer)
    {
        DateTime  dt = (DateTime) reader.Value; 

        var newDateTime= TimeZoneInfo.ConvertTime(dt, TimeZone);
        return newDateTime;
    }
}

//Deserialization
var date = "2020-08-12T18:30:13.000Z";
var json = $"{{\"Date\": \"{date}\"}}";
var convertedDateTime = JsonConvert.DeserializeObject<DateObj>(json, new DateTimeConverterTimeZone(TimeZoneInfo.FindSystemTimeZoneById("UTC-09")));

使用 JsonConverter 将日期 UTC 转换为特定时区

Convert date UTC to a specific timezone using a JsonConverter

c#

asp.net

.net

.net-core

nodatime