VB.NET DateTime.Parse Default Culture Ambiguity in Integration Tests

VB.NET DateTime.Parse Default Culture Ambiguity in Integration Tests

Goal: Ensure that integration tests run deterministically on CI pipelines and in production when parsing date strings without exposing production credentials.

Constraint: VB.NET’s DateTime.Parse and TryParse use the current thread’s CultureInfo, which varies across development, staging, and CI environments. The language documentation does not enforce a project‑level default culture, leaving the decision to the developer.

Uncertainty: When tests omit an explicit CultureInfo, the same code may interpret “01/02/2023” as January 2 or February 1 depending on the locale, potentially causing silent failures or data corruption.

Questions:

• Should VB.NET provide a project‑level or assembly‑level default culture for date parsing to guarantee consistency across environments?
• Is explicit culture specification in every parsing call the only reliable approach, or can a global setting be enforced without breaking existing code?
• How can CI pipelines detect and report culture‑dependent parsing discrepancies when production credentials are unavailable?