Date/Time Reference

If date and time were in two separate columns in the original imported data files, they are always combined into a single date/time variable in the dataset. Every numeric or string variable is optionally associated with a date/time variable; this is referred to as its Time Column, date/time pointer, or date/time reference. You can change the date/time pointer of a raw or independent column, but a computed column inherits its date/time pointer from the variable(s) on which it depends (thus you cannot build a transform using two variables with different date/time pointers).