Datetime input is incorrect when you use pattern style "S-". It confuses year 2033 with 1933, etc.

When you use in update form a datetime.tagx with pattern style "S-" for define one date and in your database have a date like xx/xx/2033 for an Object, when you try to update this record in the date input is written xx/xx/1933. If in your database have an Object with date xx/xx/1932, when you try to update this record, in the date input is written xx/xx/2032.
It seems that the date input with pattern style "S-" has a limits of years to transform a year in 1900 or 2000 and if you save the record without see this, you can lose the correct information.