Omega Seamaster Cosmic Automatic Setting Date and Time Setting data and time on this vintage Omega Seamaster Cosmic automatic timepiece. This is a two piece stem, so set the date carefully pull out the crown to position 2, to set the time carefully pull out the crown to position 1 and rotate clockwise. After setting the time and date return the crown to natural position. Very important, DO NOT attempt to set the time on your wrist as that may cause damage to the stem.Manhattan Time Service is an