In comparisons, a blank (default) ingresdate is less than any interval ingresdate. All interval ingresdates are less than all absolute ingresdates. Intervals are converted to comparable units before they are compared. For instance, before comparing ingresdate('5 hours') and ingresdate('200 minutes'), both the hours and minutes are converted to milliseconds internally before comparing the values. Ingresdates are stored in Greenwich Mean Time (GMT). For this reason, 5:00 PM Pacific Standard Time is equal to 8:00 PM Eastern Standard Time.