One letter writer to The Times [21 June 1988] 
( ( ( ( One ( letter writer ) ) ( to ( The ( Times ( -LSB- 21 ) ) ) ) ) ( June 1988 ) ) -RSB- )
(ROOT (S (NP (NP (CD One) (NN letter) (NN writer)) (PP (TO to) (NP (DT The) (NNP Times) (NNP -LSB-) (CD 21))) (NP (NNP June) (CD 1988))) (ADJP (JJ -RSB-))))
A letter written at 5 in the morning on June 21st.
( ( A letter ) ( ( ( ( written ( at 5 ) ) ( in ( the morning ) ) ) ( on ( June 21st ) ) ) . ) )
(ROOT (S (NP (DT A) (NN letter)) (VP (VBN written) (PP (IN at) (NP (CD 5))) (PP (IN in) (NP (DT the) (NN morning))) (PP (IN on) (NP (NNP June) (CD 21st)))) (. .)))