Rule Name: Time Dependency

Definition

Relative Time Point, Absolute Time Interval, and Relative Time Interval may each have a component Absolute Time Point, and the restrictions on their field values depend on the value of the Absolute Time Point component, when it is present.

1. If an Absolute Time Point is present with day = -1, then
   1. for Absolute Time Interval and Relative Time Point, delta_days = 0.
   2. for Relative Time Interval, delta_start_days = delta_stop_days = 0.

2. For Absolute Time Interval and Relative Time Point, if an Absolute Time Point is present with day <> -1 and month = SE_ANY_MONTH, then delta_days must be in the range
   (1 - day) to (30 - day)
   where day is the Absolute Time Point's day field.

   Note that delta_days is allowed to be negative for this case.

3. For Absolute Time Interval and Relative Time Point, if an Absolute Time Point is present with day <> -1, month = SE_USE_DAY_OF_YEAR, and year = -1, then delta_days must be between 0 and 365 inclusive.

4. If no Absolute Time Point component is present, or restrictions 1-3 do not apply, then delta_days has no constraints for Time Dependency.

5. For any Absolute Time Point , if month = SE_USE_DAY_OF_YEAR, then day cannot = -1.

Rationale

1. Since an Absolute Time Point with day = -1 indicates any day, no meaningful delta values can be applied to the day value for this case.

2. Time Intervals that are referenced to an Absolute Time Point with month = SE_ANY_MONTH are assumed to have a 30 day month, and the interval cannot exceed a 30 day period.

3. When using day of year (rather than explicitly specifying the month) for an unspecified year = -1, the year is assumed to be a 365-day year.

4. This rule only applies to the cases explicitly stated by the rule.

5. If the day of the year is specified rather than a specific month, then the day must fall within the bounds of a 365-day year (negative days in a year are not defined).

Example

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