https://mongodb.github.io/mongo-csharp-driver/2.13/apidocs/html/P_MongoDB_Bson_BsonValue_AsLocalTime.htm
BsonValue.AsLocalTime Property
Casts the BsonValue to a DateTime in the local timezone (throws an InvalidCastException if the cast is not valid).
bsonvalueproperty
https://mongodb.github.io/mongo-csharp-driver/2.5/apidocs/html/P_MongoDB_Bson_BsonValue_AsLocalTime.htm
BsonValue.AsLocalTime Property
Casts the BsonValue to a DateTime in the local timezone (throws an InvalidCastException if the cast is not valid).
bsonvalueproperty