Check UTC Offset

isValidUTCOffset

Type guard that checks if a value is a valid UTC offset string.

Function Signature

isValidUTCOffset(value: unknown): value is UTCOffset;

Parameters

• value: The value to check (any type)

Returns

true if the value is a valid UTC offset string, false otherwise

Example Usage

Validation Rules

1. Must start with "UTC" prefix
2. Must be followed by + or - sign
3. Hours must be 1-2 digits
4. Must include colon separator
5. Minutes must be exactly 2 digits
6. Followed by valid time components (hours 00-14, minutes 00/15/30/45)

Alias

This guard is also available as following aliases:

• isValidUTC
• isValidUTCOffSet

Type Definition

type UTCOffset = `UTC${PositiveUTCHour | NegativeUTCHour}:${UTCMinute}`;