designation keel laid launched commissioned fate
designation
keel laid
launched
commissioned
fate
number parsed year month day
number parsed year month day
number parsed year month day
text date date date text
pe-1 7 may 1918 11 july 1918 27 october 1918 sold 11 june 1930
what is the difference in days between the first two `` keel laid '' dates ?
WP VBD-AUX DT NN IN NNS IN DT JJ CD `` NNP VBN '' NNS .