Rigging Inspection Due

Calculate the next rigging inspection date from a supplied interval.

Description

Inspection scheduling adds a supplied interval to a last inspection date.

Inspection scheduling adds a supplied interval to a last inspection date. A due-date calculation is separate from establishing the appropriate interval or recording an inspection.^[1]

Calculate the next rigging inspection date from a supplied interval.

When to use Rigging Inspection Due

Use this tool to calculate the next rigging inspection date from a supplied interval.

Prepare production measurements or checklist records for one planning period. Confirm units, staffing assumptions and caller-selected criteria before running the calculation.

How to use Rigging Inspection Due and understand its results

Prepare production measurements or checklist records for one planning period. Confirm units, staffing assumptions and caller-selected criteria before running the calculation.
Enter lastInspectionDate, inspectionIntervalDays, asOfDate using the field table and calculation rules, then run the tool.
Read nextInspectionDate, daysUntilDue, overdue. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
lastInspectionDate	Last inspection date	string	Required
inspectionIntervalDays	Inspection interval (days)	integer; minimum: 1	Required
asOfDate	As-of date	string	Required

Enter YYYY-MM-DD dates and a positive integer interval. Parse midnight UTC, add calendar days in UTC and compare with the explicit as-of date. Return next date, signed days remaining and overdue only when days remaining is negative; due today is not overdue.

nextDate=lastDate+intervalDays; daysUntilDue=ceil((next−asOf)/86400000)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
nextInspectionDate	Next inspection date	string
daysUntilDue	Days until due	integer
overdue	Inspection is overdue	boolean

json

{
  "input": {
    "lastInspectionDate": "2025-01-01",
    "inspectionIntervalDays": 365,
    "asOfDate": "2025-12-01"
  },
  "output": {
    "nextInspectionDate": "2026-01-01",
    "daysUntilDue": 31,
    "overdue": false
  }
}

Limitations and assumptions

No inspection standard or equipment history is supplied. JavaScript Date can normalize some impossible dates, such as overflowing month days; confirm real calendar dates. Weekends and holidays are not shifted.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use Rigging Sign-Off Audit: Audit required rigging sign-offs. For a complementary task, use Summons Response Window: Calculate a tax-summons response deadline from a caller-supplied window.

References

Rigging Inspection Due — tool.io

Similar or alternative tools

Rigging Sign-Off Audit
Audit required rigging sign-offs.
Summons Response Window
Calculate a tax-summons response deadline from a caller-supplied window.