X 6.1.5.2 Arithmetic with Date Fields
X Arithmetic operations that include a date field are restricted to:
- X Adding a non-date to a date field
- X Subtracting a non-date from a date field
- X Subtracting a date field from a compatible date field
X Date field operands are compatible if they have the same date format
X except for the year part, which may be windowed or expanded.
X The following operations are not allowed:
- X Any operation between incompatible dates
- X Adding two date fields
- X Subtracting a date field from a non-date
- X Unary minus, applied to a date field
- X Division, exponentiation, or multiplication of or by a date field
- | Arithmetic expressions that specify a year-last date field
- | Arithmetic statements that specify a year-last date field, except as a
| receiving data item when the sending field is a non-date
X The following topics describe the result of using date fields in the
X supported addition and subtraction operations.
X For more information on using date fields in arithmetic operations, see:
- X "ADD Statement" in topic 6.2.2
- X "COMPUTE Statement" in topic 6.2.7
- X "SUBTRACT Statement" in topic 6.2.38
X Notes:
X 1. Arithmetic operations treat date fields as numeric items; they do not
X recognize any date-specific internal structure. For example, adding 1
X to a windowed date field containing the value 991231 (that might be
X used in an application to represent December 31, 1999) results in the
X value 991232, not 000101.
X 2. When used as operands in arithmetic expressions or arithmetic
X statements, windowed date fields are automatically expanded according
X to the century window specified by the YEARWINDOW compiler option.
| >_Host_> When the DATEPROC(TRIG) compiler option is in effect, this
| expansion is sensitive to trigger values in the windowed date field.
| <_Host_< For details of >_Host_> both regular and trigger-sensitive
| <_Host_< windowed expansion, see "Semantics of Windowed Date Fields"
X in topic 5.3.6.1.
Subtopics:
- 6.1.5.2.1 Addition Involving Date Fields
- 6.1.5.2.2 Subtraction Involving Date Fields
- 6.1.5.2.3 Storing Arithmetic Results That Involve Date Fields
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