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1.4.1 • Public • Published

Retail Calendar

A configurable merchandising and retail calendar generator. For a given year and configuration, generates merchandising calendar along with Gregorian boundaries. It can be used for generating all calendar types, including NRF 4-5-4 calendar, 4-4-5 calendar or Gregorian calendar.


Using npm:

 $ npm i --save retail-calendar


Instantiate RetailCalendarFactory with preferred options.

const {
} = require('retail-calendar')

const calendar = new RetailCalendarFactory(
    weekCalculation: WeekCalculation.LastDayNearestEOM,
    weekGrouping: WeekGrouping.Group454,
    lastDayOfWeek: LastDayOfWeek.Saturday,
    lastMonthOfYear: LastMonthOfYear.January,
    restated: false,

A retail calendar either has 52 or 53 weeks.

calendar.year // Given year, 2017 in this case

A retail calendar always has 12 months.

calendar.months[0].monthOfYear // Starts from 1, up to 12

A retail calendar has quarter of year and week of quarter

Both Month and Week has quarter information

calendar.months[0].quarterOfYear // from 1 to 4
calendar.weeks[0].quarterOfYear // from 1 to 4

The week also has week of quarter:


Each month consist of complete weeks. Month boundaries are always at the end of week. End of week is given in lastDayOfWeek option. Number of weeks for each month is defined in weekGrouping option.

// Week grouping is 454 which means
calendar.months[0].numberOfWeeks // 4
calendar.months[1].numberOfWeeks // 5
calendar.months[2].numberOfWeeks // 4

calendar.months[3].numberOfWeeks // 4
calendar.months[4].numberOfWeeks // 5
calendar.months[5].numberOfWeeks // 4
// Each quarter repeats the same pattern.

// Each month has an array of weeks it contains.

Each month start and end boundaries expressed in Gregorian calendar.

// Date time of beginning of month.
// In this case Feb 5, 2017 12:00 AM
// Date time of end of month.
// In this case March 5, 2017 11:59.999 PM

All weeks in a retail calendar are also directly accessible. Each week also has boundaries available in Gregorian calendar.

calendar.weeks // All weeks in calendar.
calendar.weeks[0].gregorianStartDate // Date
calendar.weeks[0].gregorianEndDate // Date

53 week years

Based on given configuration, a year may contain 52 weeks. This complicates comparing months to previous year. This case is handled specially based on given restated option. Number

If restated is true

FIRST week of year is "dropped". It doesn't belong the any month.

// Restated calendar example.
// First week of year has no month.
// Note that first week's weekOfYear is -1.
calendar.numberOfWeeks // 53
calendar.weeks[0].weekOfYear // -1
calendar.weeks[0].weekOfMonth // -1
calendar.weeks[0].monthOfYear // -1

// First month still starts from first week
calendar.months[0].weeks[0].weekOfYear // 0

If restated is false

LAST week of year is "dropped".

// Restated calendar example.
// First week of year has no month.
calendar.weeks[52].weekOfYear // -1
calendar.weeks[52].weekOfMonth // -1
calendar.weeks[52].monthOfYear // -1

// First month starts from 1st week
calendar.months[0].weeks[0].weekOfYear // 0



Positive integer from 1 (Monday) to 7 (Sunday). Identifies on which day of week the calendar weeks end. Years, months, weeks of the retail calendar always ends on this day of week.


Identifies which method to use when calculating end of the retail calendar year.

See 4-4-5 Calendar article for how both of these methods work.

  • WeekCalculation.LastDayNearestEOM: Use the last end of retail week, nearest the end of last gregorian month in the year.

  • WeekCalculation.LastDayBeforeEOM: Use the last end of retail week, before the end of last gregorian month in the year.

  • WeekCalculation.FirstBOWOfFirstMonth: Use the first, beginning of week day, of the start month as the start day of year.


Specifies the month the year ends. Plan year is the Gregorian year of the first month.

For example if last month is January and given year is 2017. The last month of retail calendar is January 2018 If last month is December and given year is 2017. The last month of retail calendar is December 2017.


Specifies how many weeks each month has in a quarter.

  • WeekGrouping.Group454: 1st month has 4 weeks, 2nd has 5, 3rd has 4. Repeats for each quarter.
  • WeekGrouping.Group544: 1st month has 5 weeks, 2nd has 4, 3rd has 4. Repeats for each quarter.
  • WeekGrouping.Group445: 1st month has 4 weeks, 2nd has 4, 3rd has 5. Repeats for each quarter.


boolean. If true, in leap years, first week is not included in any month. Otherwise, in leap years, last week is not included in any month.

Has not effect on 52 week years.


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