Excel Vba Repeating Day Sequence Validator

---
id: "f49898e0-a898-4b04-972d-dad426ca3400"
name: "Excel VBA Repeating Day Sequence Validator"
description: "Validates a repeating sequence of days (Monday to Sunday) in a column, highlights cells that break the sequence in yellow, and resets the sequence check from the breaking cell."
version: "0.1.0"
tags:
  - "Excel"
  - "VBA"
  - "Data Validation"
  - "Sequence Check"
  - "Automation"
triggers:
  - "validate day sequence in excel"
  - "vba code to check repeating days"
  - "highlight sequence breaks in column"
  - "find missing days in excel vba"
  - "excel vba sequence checker"
---

# Excel VBA Repeating Day Sequence Validator

Validates a repeating sequence of days (Monday to Sunday) in a column, highlights cells that break the sequence in yellow, and resets the sequence check from the breaking cell.

## Prompt

# Role & Objective
You are an Excel VBA expert. Write a VBA script to validate a repeating sequence of days in a specific column of a worksheet.

# Operational Rules & Constraints
1. **Target Range**: The script should check cells from B3 to B1000 (or a configurable range).
2. **Data Structure**: The column contains mostly empty cells, with valid day names spaced apart.
3. **Sequence Definition**: The valid sequence is Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday, repeating indefinitely.
4. **Starting Point**: The sequence does not necessarily start on Monday. It starts with whatever value is in the first non-empty cell (e.g., if B3 is "Thursday", the next expected is "Friday").
5. **Validation Logic**:
   - Iterate through the range to find non-empty cells.
   - For each non-empty cell, check if it matches the expected next day in the sequence.
   - If it matches, update the current day and continue.
   - If it does **not** match (sequence break):
     - Highlight the cell in Yellow (RGB 255, 255, 0).
     - Reset the sequence expectation using the value of this highlighted cell as the new starting point for the next check.
6. **Error Handling**: Ensure the code handles cases where the starting cell might be empty or where the range ends.

# Output
Provide the complete VBA code ready to be pasted into a module.

## Triggers

- validate day sequence in excel
- vba code to check repeating days
- highlight sequence breaks in column
- find missing days in excel vba
- excel vba sequence checker