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我从 JS 方面开始：

var startDate = new Date("Thu Nov 19 2020 00:00:01 GMT+1100 (Australian Eastern Daylight Time)");
var unixStartDate = startDate.getTime(); // 1605704401000

var endDate = new Date("Thu Nov 19 2020 23:59:59 GMT+1100 (Australian Eastern Daylight Time)");
var unixEndtDate = endDate.getTime(); // 1605790799000

我现在发送unixStartDate unixEndtDate到我的 .NET5 EF 核心服务器与 JS 客户端和我做的 SQL 服务器在同一台机器上：

var startDateUTC = DateTimeOffset.FromUnixTimeMilliseconds(unixStartDate); 
var startDateStr = startDateUTC.ToString(); // {18-Nov-20 1:00:01 PM +00:00}

var endDateUTC = DateTimeOffset.FromUnixTimeMilliseconds(unixEndDate); 
var endDateStr = endDateUTC.ToString(); // {19-Nov-20 12:59:59 PM +00:00}

dbc.SystemLogs
  .Where(v => startDateUTC <= v.LogTime)
  .Where(v => v.LogTime <= endDateUTC)
  .ToList()

在我的 EF 日志中，我看到：

Executed DbCommand (947ms) [Parameters=[@__startDateUTC_1='2020-11-18T13:00:01.0000000+00:00' (Nullable = true), @__endDateUTC_2='2020-11-19T12:59:59.0000000+00:00' (Nullable = true)], CommandType='Text', CommandTimeout='30']
      SELECT [s].[LogText], [s].[LogTime]
      FROM [SystemLog] AS [s]
      WHERE (@__startDateUTC_1 <= CAST([s].[LogTime] AS datetimeoffset))) AND (CAST([s].[LogTime] AS datetimeoffset) <= @__endDateUTC_2)

请注意，LogTime 是datetimeSQLserver 上的类型

但是我得到的结果来自错误的日期：

{SystemLog { LogTime = 18-Nov-20 4:13:36 PM, LogText = User Session Expired. }} 
{SystemLog { LogTime = 18-Nov-20 4:10:47 PM, LogText = User Login Success. }}

那就是我从 11 月 18 日而不是 11 月 19 日得到结果我在这里错过了什么？

我也试过：

DateTimeOffset startDate = TimeZoneInfo.ConvertTime(startDateUTC, TimeZoneInfo.Local);
DateTimeOffset endDate = TimeZoneInfo.ConvertTime(endDateUTC, TimeZoneInfo.Local);

dbc.SystemLogs
  .Where(v => startDate <= v.LogTime)
  .Where(v => v.LogTime <= endDate)
  .ToList()

然后运行相同的查询。我懂了：

Executed DbCommand (947ms) [Parameters=[@__startDateUTC_1='2020-11-19T00:00:01.0000000+11:00' (Nullable = true), @__endDateUTC_2='2020-11-19T23:59:59.0000000+11:00' (Nullable = true)], CommandType='Text', CommandTimeout='30']
      SELECT [s].[LogText], [s].[LogTime]
      FROM [SystemLog] AS [s]
      WHERE (@__startDateUTC_1 <= CAST([s].[LogTime] AS datetimeoffset))) AND (CAST([s].[LogTime] AS datetimeoffset) <= @__endDateUTC_2)

但我得到了同样的错误结果

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1 回答 1

1

好的，问题是我不需要DateTime查询DateTimeOffsetSQLserver，因为字段类型是DateTime.

所以这是整个工作：

JS客户端：

var startDate = new Date("Thu Nov 19 2020 00:00:01 GMT+1100 (Australian Eastern Daylight Time)");
var unixStartDate = startDate.getTime(); // 1605704401000

var endDate = new Date("Thu Nov 19 2020 23:59:59 GMT+1100 (Australian Eastern Daylight Time)");
var unixEndtDate = endDate.getTime(); // 1605790799000

.NET 核心服务器：

namespace System {
  public static class UnixTime {
    static public DateTime ToLocalDateTime(long unixTimeMs) {
      return DateTimeOffset.FromUnixTimeMilliseconds(unixTimeMs).LocalDateTime;
    }
  }
}

DateTime startDate = UnixTime.ToLocalDateTime(unixStartDate);
DateTime endDate = UnixTime.ToLocalDateTime(unixEndDate);

dbc.SystemLogs.Where(v => startDate <= v.LogTime && v => v.LogTime <= endDate)
于 2020-11-26T00:04:27.987 回答