The default internal format for numeric standalone fields is packed-decimal. The default internal format for numeric data structure subfields is zoned-decimal. To specify a different internal format, specify the format desired in position 40 on the definition specification for the field or subfield.
The default format for date, time, and timestamp fields is *ISO. In general, it is recommended that you use the default ISO internal format, especially if you have a mixture of external format types.
For date, time, and timestamp fields, you can use the DATFMT and TIMFMT keywords on the control specification to change the default internal format, if desired, for all date-time fields in the program. You can use the DATFMT or TIMFMT keyword on a definition specification to override the default internal format of an individual date-time field.