What format do you need the dates in? As strings? If not, I would recommend using datevec() to convert it to a matrix in the form:
[year, month, day, h, min, s]
so for example:
v = datevec(timestamp, 'mm/dd HH:MM:SS');
You can then separate v(1:3,:) (year, month & day) and v(4:6,:) (hours, minutes & seconds).