Do Americans leave the ordinal suffix out of dates? By 'ordinal suffix' I mean '-th', '-nd', '-rd', e.g. 'April 17' instead of 'April 17th'. If they do, is there an explanation for this behavior?
If I have a date written: Saturday 16 December is it correct ? Or does the grammar oblige me to add the number suffix to 16 making 16th as in: Saturday 16th December ?