Courtesy of the ?strptime help file (with the example changed to your value):
z <- strptime("2010-01-15 13:55:23.975","%Y-%m-%d %H:%M:%OS")
z # prints without fractional seconds
op <- options(digits.secs=3)
z
options(op)#reset optionsCourtesy of the ?strptime help file (with the example changed to your value):
z <- strptime("2010-01-15 13:55:23.975","%Y-%m-%d %H:%M:%OS")
z # prints without fractional seconds
op <- options(digits.secs=3)
z
options(op)#reset options