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+## Description
+
+You could define custom format codes.
+
+## Code
+
+```ruby
+require 'axlsx'
+
+p = Axlsx::Package.new
+wb = p.workbook
+
+s = wb.styles
+date = s.add_style format_code: 'yyyy-mm-dd'
+percent = s.add_style format_code: '0%'
+padded = s.add_style format_code: '00#'
+
+wb.add_worksheet(name: 'Formatting Data') do |sheet|
+  # require 'date'
+  sheet.add_row ['Custom Formatted Date', 'Percent Formatted Float', 'Padded Numbers']
+  sheet.add_row [Date.today, 0.2, 32], style: [date, percent, padded]
+end
+
+p.serialize 'format_codes_example.xlsx'
+```
+
+## Output
+
+![Output](images/format_codes_example.png "Output")