Let's make some sample dates and times.
n = 10;
T = datetime('today');
d = T + ...
hours(randi([-24, 24], n, 1)) + ...
minutes(randi(60, n, 1)) + ...
seconds(randi(60, n, 1))
histogram(d, BinWidth = hours(1))
By default this isn't going to show enough ticks on the X axis for my taste. This adds a few more.
xticks(T + hours(-24:4:24))
