Calendar Editor

Applies to: Pro · Enterprise Last updated: 27-Feb-2026

Overview

The Calendar Editor lets you define and manage project calendars. Each calendar specifies a weekly work pattern (which days and how many hours) plus date-specific exceptions (holidays, shutdowns, overtime days). The editor uses a P6-inspired layout with a calendar list, a month-view hero panel, and action controls.

Prerequisites

• Active Pro or Enterprise subscription
• Editor Mode enabled
• At least one project loaded

Opening the Calendar Editor

Open the Calendar Editor from:

• The Editor Sidebar → Calendar Editor button
• Step 2 of the New Project Wizard

Layout

The editor has three sections:

Section	Position	Contents
Calendar List	Left sidebar	All project calendars with selection
Month View	Centre	Interactive month calendar with colour-coded days
Actions	Right controls	Add/rename/delete calendars, work week presets

Day Types & Colour Coding

Day Type	Colour	Description
Work Day	White (#ffffff)	Normal working day
Non-Work Day	Light blue (#d6e4f0)	Weekend or non-working day
Exception — Non-Work	Light red (#ffe0e0)	Holiday or shutdown
Exception — Work	Light yellow (#fff3cd)	Overtime or special work day

The day order follows the P6 convention: Fri, Sat, Sun, Mon, Tue, Wed, Thu.

Monthly Statistics

The header bar displays statistics for the currently viewed month:

• Work Days — number of working days
• Total Hours — sum of working hours
• Exceptions — number of exception dates

Weekly Pattern Editor

The weekly pattern defines default work hours for each day of the week.

Day	Colour	Default (5d × 8h)
Sunday	Red (#f5222d)	0h
Monday–Friday	Blue (#1677ff)	8h
Saturday	Orange (#fa8c16)	0h

Enter hours per day as a number between 0 and 24. Setting 0 hours marks that day as non-work.

Work Week Presets

Preset	Pattern	Total Hours/Week
5d × 8h	Mon–Fri, 8h each	40h
6d × 8h	Mon–Sat, 8h each	48h
7d × 8h	Every day, 8h each	56h
5d × 10h	Mon–Fri, 10h each	50h
7d × 24h	Every day, 24h each	168h

Click a preset button to instantly apply that pattern.

Exception Editor

Exceptions override the weekly pattern for specific dates.

Field	Description
Date	Select the exception date via date picker
Hours	Working hours for that date (0 = holiday)

Exceptions appear in a table below the monthly view.

• 0 hours creates a holiday (non-work exception, shown in red on the calendar)
• Any positive hours creates a work exception (shown in yellow on the calendar)

Calendar Preview

The preview panel shows a mini month-view (32×32px cells) with colour coding:

Colour	Meaning
Red background (#fff1f0)	Exception holiday
Orange background (#fff7e6)	Modified work hours
Blue background (#e6f4ff)	Normal work day
Grey background (#f5f5f5)	Non-work day

Managing Calendars

Add a Calendar

1. Click Add Calendar
2. Enter a name for the new calendar
3. Configure the weekly pattern and exceptions

Delete a Calendar

Select a calendar from the list and click Delete. You cannot delete a calendar that is assigned to activities.

Commands

All calendar operations support undo/redo:

Command	Description
AddCalendarCommand	Creates a new calendar
UpdateCalendarCommand	Modifies weekly pattern
DeleteCalendarCommand	Removes a calendar
AddCalendarExceptionCommand	Adds a date exception
DeleteCalendarExceptionCommand	Removes a date exception

Tips & Best Practices

• Create separate calendars for different work shifts (e.g., "Day Shift 5×8", "7-Day Shutdown")
• Always add public holidays as non-work exceptions before running CPM
• Use the 7d × 10h preset for turnaround/shutdown projects
• The P6-style day order (Fri–Thu) matches Oracle Primavera P6 for easy comparison

Related Documentation

• Create New Project — Calendar selection during project setup
• Schedule Calculation — How calendars affect the CPM engine
• Schedule Options — Default calendar and lag calendar settings