UTC Zoned Temporal Types

Goal

When the stack supports timezone-aware built-in or standard-library temporal types, use those types and set their timezone to UTC.

Treat this skill as normalization guidance for timezone-aware temporal values. The key question is whether the code can use a built-in temporal type that carries timezone semantics. If it can, represent the value in UTC instead of server-local time, user-local time, or an arbitrary geographic timezone.

What Counts as In Scope

Apply this skill to code that does one or more of these things:

• defines timezone-aware datetime or timestamp fields
• defines temporal parameters or return types that can carry timezone information
• parses or serializes timezone-aware temporal values
• maps timezone-aware values to persistence or transport boundaries
• converts between local time and a normalized stored or exchanged value
• configures default timezones for timezone-aware temporal types