Advanced Planning, Scheduling & APS worked example

Frozen Schedule Window Check with days until production start of 1.5 days: a worked example

Suppose days until production start falls to 1.5 days. This page works the full calculation at that level so you can see exactly which result moves and by how much. Check whether a requested schedule change falls inside the protected frozen window between release and production start.

The inputs for this scenario

  • Days until production start: 1.5 days (the input this scenario stresses; the baseline uses 3)
  • Frozen window start: 0 days (held at the documented default)
  • Planning horizon limit: 7 days (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Inside frozen schedule window = days until production start between frozen window start and planning horizon limit.
  • Inside frozen schedule window works out to 1 inside/outside at these inputs, and this is the headline figure for the scenario.
  • Days to nearest schedule boundary works out to 1.5 days at these inputs.
  • Frozen window start works out to 0 days at these inputs.
  • Planning horizon limit works out to 7 days at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where days until production start sits at 3 days and the headline result is 1 inside/outside, this scenario lands almost exactly on the baseline at 1 inside/outside.
  • It returns whether the days-to-start value sits between the frozen window start and the planning horizon limit, and how close it is to the nearest boundary. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Inside frozen schedule window: 1 inside/outside (headline result)
  • Days to nearest schedule boundary: 1.5 days
  • Frozen window start: 0 days
  • Planning horizon limit: 7 days

Run it with your numbers

  • To rerun this with your own numbers, open the live Frozen Schedule Window Check calculator, set days until production start to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.