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4-4-5 Fiscal Period Builder

Build a 52-week 4-4-5 retail calendar from an explicit starting date.

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4-4-5 Fiscal Period Generator online

Build a 52-week 4-4-5 retail calendar from an explicit starting date. Use this to inspect or plan dates and time windows from explicit reference values. Fixed examples make the result independent of the date on which this page is opened.

How to use it

Enter a value or text in the format shown in the example. Set weekly pattern. Choose Run tool. Review the output, then copy or download it.

Options and example settings

Option	Choices / value	Example default
Weekly pattern	4-4-5 / 4-5-4 / 5-4-4	4-4-5

Worked examples

Use this to inspect or plan dates and time windows from explicit reference values. Fixed examples make the result independent of the date on which this page is opened.

Reproducible worked example

Settings: Weekly pattern: 4-4-5

Input:

2026-02-01

With the input and settings above, the tool produces:

Output:

[
  {
    "period": 1,
    "weeks": 4,
    "start": "2026-02-01",
    "endInclusive": "2026-02-28"
  },
  {
    "period": 2,
    "weeks": 4,
    "start": "2026-03-01",
    "endInclusive": "2026-03-28"
  },
  {
    "period": 3,
    "weeks": 5,
    "start": "2026-03-29",
    "endInclusive": "2026-05-02"
  },
  {
    "period": 4,
    "weeks": 4,
    "start": "2026-05-03",
    "endInclusive": "2026-05-30"
  },
  {
    "period": 5,
    "weeks": 4,
    "start": "2026-05-31",
    "endInclusive": "2026-06-27"
  },
  {
    "period": 6,
    "weeks": 5,
    "start": "2026-06-28",
    "endInclusive": "2026-08-01"
  },
  {
    "period": 7,
    "weeks": 4,
    "start": "2026-08-02",
    "endInclusive": "2026-08-29"
  },
  {
    "period": 8,
    "weeks": 4,
    "start": "2026-08-30",
    "endInclusive": "2026-09-26"
  },
  {
    "period": 9,
    "weeks": 5,
    "start": "2026-09-27",
    "endInclusive": "2026-10-31"
  },
  {
    "period": 10,
    "weeks": 4,
    "start": "2026-11-01",
    "endInclusive": "2026-11-28"
  },
  {
    "period": 11,
    "weeks": 4,
    "start": "2026-11-29",
    "endInclusive": "2026-12-26"
  },
  {
    "period": 12,
    "weeks": 5,
    "start": "2026-12-27",
    "endInclusive": "2027-01-30"
  }
]

The example returns 12 top-level items in an array. Each item is a record; the first record contains “period”, “weeks”, “start”, “endInclusive”.

Limitations and common mistakes

Exactly 52 weeks from your supplied start. Does not infer a company year anchor, 53rd week or legal reporting policy.
Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Enter a value or text in the format shown in the example. The worked example shows the supported structure and actual output.

How can I create a 52-week 4-4-5 retail calendar from an explicit starting date online?

Enter a value or text in the format shown in the example. Set weekly pattern. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.