When I insert the datatime row into a table as below, I get different result. Any idea?

use tempdb

go

create table test1 (dat datetime)

go

insert into test1 values('1753-01-01')

select * from test1

RESULT:

1753-01-01 00:00:00.000

insert into test1 values(1753-01-01)

select * from test1

RESULT:

1904-10-18 00:00:00.000

:unsure:

Thanks

big[M]