# Calendars in Infor LN: create, assign and how they drive planning

> Source: https://netray.co/erp-help/infor-ln-calendar-setup-general-and-enterprise-unit
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: ERP Help

## Short answer

Infor LN calendars define working and non-working days and available hours. You create a calendar with its day types and exceptions, assign it to enterprise units (such as sites, work centers or warehouses), and planning, scheduling and delivery date calculations use the calendar of the relevant unit.

## Kind

how-to

## System

infor-ln

## Erp

Infor LN

## Module

Common Data / Calendars

## Query

calendar infor ln

## Alternate Queries

- infor ln create calendar
- infor ln enterprise unit calendar
- infor ln work center calendar

## Applies To

Infor LN 10.x. Session names and codes vary by version.

## Steps

### Create and assign a calendar

**Items:**

- Create the calendar code in the Common Data calendar sessions and give it a description.
- Define the standard week pattern: working days, start and end times, and breaks, or shift patterns if used.
- Add exceptions for public holidays and planned shutdowns, with the date range and whether the day is working or not.
- Assign the calendar to the enterprise unit, work center or warehouse that should use it.
- Generate or update the derived calendar data so that the planning engine reads the new dates.
- Test with a simple order: check the calculated start and delivery dates cross the holiday as expected.

## Sections

### General calendars versus enterprise-unit calendars

**Body:**

A general calendar is a reusable pattern. An enterprise-unit calendar is the calendar actually in force for a site, work center or warehouse. Several units can point at one general calendar, which keeps the holiday list in one place.

Separate calendars are justified where plants have different shifts or national holidays. Over-differentiating makes maintenance painful each year.

### What reads the calendar

**Body:**

Production scheduling uses work center calendars for operation start and end. Enterprise Planning uses the site calendar for lead-time offset. Purchase and sales use warehouse or supplier calendars for promised dates. A wrong calendar shows up as dates falling on weekends or planned orders offset by a day.

After changing a calendar, previously planned orders do not shift automatically. Re-run the planning or rescheduling to pick up the change.

### Annual maintenance

**Body:**

Extend calendars before the year ends, otherwise date calculation beyond the last defined date can produce errors or defaults. Put it on the January and December admin checklist and keep one owner.

## Pitfalls

- Calendar defined but not assigned to the unit that uses it.
- Forgetting to regenerate derived calendar data after edits.
- Calendar horizon running out at year end.
- Assuming existing orders reschedule on their own.
- Too many similar calendars.

## Ai Angle

An on-prem assistant can answer 'which calendar does work center X use and why did this order land on a Sunday' by reading calendar and assignment tables. Read-only, inside your network, with your LN roles respected.

## Faq

### Where do I assign a calendar to a work center?

**Answer:** In the work center master data under Manufacturing. The calendar field points to the calendar code that governs availability for scheduling.

### Why are dates ignoring my holiday?

**Answer:** The exception may be missing, the derived data may not be regenerated, or the unit may use another calendar. Check the assignment first.

### Do calendar changes reschedule existing orders?

**Answer:** No. Re-plan or reschedule open orders to apply new dates.

### Can one calendar serve multiple sites?

**Answer:** Yes, if working patterns and holidays are identical. Otherwise create separate calendars.

## Search terms

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