13 | Business Calendar Deep Dive

A detailed explanation of how Business (Accounting) Calendars function and report per Bepoz Setup Summary The 4–4–5 calendar is a method of managing accounting periods, and is a common calendar structure for some industries such as retail and manufacturing . The 4–4–5 calendar divides a year into four quarters of 13 weeks grouped into two 4-week "months" and one 5-week "month". The grouping of 13 weeks may also be set up as 5–4–4 weeks or 4–5–4.

A detailed explanation of how Business (Accounting) Calendars function and report per Bepoz Setup 

The 4–4–5 calendar is a method of managing accounting periods, and is a common calendar structure for some industries such as retail and manufacturing.

The 4–4–5 calendar divides a year into four quarters of 13 weeks grouped into two 4-week "months" and one 5-week "month". The grouping of 13 weeks may also be set up as 5–4–4 weeks or 4–5–4.

When this type of calendar is in use, reports with month-by-month comparisons or trends are flawed as one month is 25% longer than the other two. It could still compare a period to the same period in the prior year, or use week by week data comparisons.

Its major advantage over a regular calendar is that the end date of the period is always the same day of the week, which is useful for shift or manufacturing planning as every period is the same length.

A disadvantage of the 4–4–5 calendar is that it has only 364 days (7 days x 52 weeks), meaning a 53rd week will need to be added every five or six years: this can make year-on-year comparison difficult.

Weeks Per Year

The long years, with 53 weeks in them, can be described by any of the following equivalent definitions:

Any year start on Thursday (dominical letter D or DC) and any leap year starting on Wednesday (ED)

Any year ending on Thursday (D, ED) and any leap year ending on Friday (DC)

Years in which 1 January or 31 December are Thursdays

All other week-numbering years are short years and have 52 weeks.

The number of weeks in a given year is equal to the corresponding week number of 28 December, because it is the only date that is always in the last week of the year since it is a week before 4 January which is always in the first week of the following year

ISO 8601 - Standard

Using only the ordinal year number y, the number of weeks in that year can be determined:

The Start Date of a Business Calendar is how Bepoz calculates the 13-week periods and when they start when setting up a new system this needs to be two years prior (730 Days)

Examples:

If the Start Date is set to the 1^st of Jan then your First Month is Jan (Month 1) but if you start your calendar in say July then July is Month 1 so your rolling period 4-4-5, 4-5-4 or 5-4-4 won't calculate a normal year starting from January 1^st for each year but will be calculated from the Start Date Month and Day.