Can I override default Bson datetime reader to read datetime as utc?

This solution doesn’t work for me.

            BsonMapper.Global.RegisterType<DateTime>(
                dateTime => new BsonValue(dateTime.ToMillisUnixTimestamp()),
                bsonValue => DateTimeExtensions.MillisUnixTimestampToDateTime(bsonValue.AsInt64)
            );

[mbdavid]

It´s better use Serialize/Deserialize method in this case:

Deserialize Func is Func<BsonValue, BsonMapper, object> Serialize Func is Func<BsonValue, BsonMapper, object>

BsonMapper.Global.ResolveMember((type, memberInfo, member) =>
{
    if(member.DataType == typeof(DateTime))
    {
        member.Deserialize = (v, m) => v.AsDateTime.ToMillisUnixTimestamp();
        member.Setter = (o, m) => DateTimeExtensions.MillisUnixTimestampToDateTime(Convert.ToInt64(o));
    } 
});

This will override all DateTime types to convert to Int64 before serialize into Bson.

[mbdavid]

Hi @Try4W, custom data type are not supported in basic already implemented internal types. But you can write your own mapper getter/setter function (implement ResolveMember method).

BsonMapper.Global.ResolveMember((type, memberInfo, member) =>
{
    if(member.DataType == typeof(DateTime))
    {
        member.Getter = ...
        member.Setter = ...
    } 
});