Formatting inconsistencies are everywhere in real-world data. Dates written as "Jan 5, 2024," "01/05/2024," and "2024-01-05" all represent the same day — but a computer treats them as three different values.
Common Formatting Problems
Dates and Times
Date formats vary enormously: MM/DD/YYYY vs DD/MM/YYYY vs YYYY-MM-DD. The international standard is ISO 8601 (YYYY-MM-DD). Standardizing to this format eliminates ambiguity and makes sorting and comparison work correctly.
Phone Numbers
Canadian phone numbers appear in many formats: (416) 555-1234, 416-555-1234, 4165551234, +1 416 555 1234. Choose one standard format and apply it consistently. Storing digits only (no formatting characters) is often the most flexible approach.
Postal Codes
Canadian postal codes should follow the format A1A 1A1 (with a space). Common problems include missing spaces, lowercase letters, and extra characters. Validation against Canada Post's postal code database can catch invalid codes.
Names
Inconsistent capitalization ("john smith," "JOHN SMITH," "John Smith") and abbreviations ("St." vs "Street," "Ave" vs "Avenue") create near-duplicate problems. Standardize case and expand abbreviations consistently.
When comparing or matching records, normalize values first — convert to lowercase, remove punctuation, expand abbreviations. This makes matching much more reliable without permanently changing your data.
Whitespace and Special Characters
Leading and trailing spaces, non-breaking spaces, and special characters can cause matching failures that are hard to diagnose. Trim whitespace from all text fields as a standard cleaning step.
Learn about the special challenges of Address Validation.