The EXTRACT-DATE-TIME function returns part of a date, time, or timestamp item.
The function type is integer or alphanumeric. If argument-2 is a keyword (such as MONTHS or DAYS), or consists of only numeric specifiers, an integer is returned. Otherwise, an alphanumeric data item is returned.
Format >>-FUNCTION EXTRACT-DATE-TIME--(--argument-1--argument-2--)----><
Argument-2 is a keyword that represents a duration or a non-numeric literal that contains one or more separators and conversion specifications.
If the non-numeric literal contains only numeric conversion specifiers, the value returned by the EXTRACT-DATE-TIME function is an integer. A non-numeric literal containing separators or alphanumeric conversion specifiers will result in an alphanumeric return value.
If argument-2 is a keyword, an integer is returned.
PICOSECONDS ('@Sp'). 
For a list of other valid conversion specifications see Table 1 in the description of the FORMAT clause of the SPECIAL-NAMES paragraph.
If argument-1 is not a locale-based data item, then the locale-based conversion specifier (%p, in this case) is treated as a non-locale-based conversion specifier and the % is replaced with an @. Using our example, this means that %p would become @p, where @p is the non-locale-based equivalent of %p.
PICOSECONDS can only be extracted from a timestamp item. 