fix #970 报”按月分表时间至少大于当前时间一个月“错误

IoTSharp.Data.TimeSeries/DependencyInjection.cs

@@ -30,30 +30,24 @@ namespace IoTSharp.Data.TimeSeries
             {
                 case TelemetryStorage.Sharding:
                     ShardingByDateMode settingsShardingByDateMode = settings.ShardingByDateMode;
-                    var sbt = DateTime.Now.Subtract(settings.ShardingBeginTime);
                     var _sharding = services.AddShardingDbContext<ShardingDbContext>();
                     _sharding.UseRouteConfig(o =>
                     {
                         switch (settingsShardingByDateMode)
                         {
                             case ShardingByDateMode.PerMinute:
-                                if (sbt.TotalMinutes < 5) throw new ArgumentException($"按分钟分表时间至少大于当前时间五分钟。");
                                 o.AddShardingTableRoute<TelemetryDataMinuteRoute>();
                                 break;
                             case ShardingByDateMode.PerHour:
-                                if (sbt.TotalHours < 1) throw new ArgumentException($"按小时分表时间至少大于当前时间一小时。");
                                 o.AddShardingTableRoute<TelemetryDataHourRoute>();
                                 break;
                             case ShardingByDateMode.PerDay:
-                                if (sbt.TotalDays < 1) throw new ArgumentException($"按日分表时间至少大于当前时间一天。");
                                 o.AddShardingTableRoute<TelemetryDataDayRoute>();
                                 break;
                             case ShardingByDateMode.PerMonth:
-                                if (sbt.TotalDays < DateTime.Now.Subtract(DateTime.Now.Date.AddDays(-DateTime.Now.Day)).TotalDays) throw new ArgumentException($"按月分表时间至少大于当前时间一个月。");
                                 o.AddShardingTableRoute<TelemetryDataMonthRoute>();
                                 break;
                             case ShardingByDateMode.PerYear:
-                                if (sbt.TotalDays < DateTime.Now.Subtract(DateTime.Now.Date.AddMonths(-DateTime.Now.Month)).TotalDays) throw new ArgumentException($"按月分表时间至少大于当前时间一个月。");
                                 o.AddShardingTableRoute<TelemetryDataYearRoute>();
                                 break;
                             default: throw new InvalidOperationException($"unknown sharding mode:{settingsShardingByDateMode}");