/**
 * Converts a UTC offset string to a GraphQL-safe enum name.
 * Uses `_TZOFFSET_` prefix to avoid conflicts with user-defined enum values.
 *
 * Examples:
 * - '+05:30' → '_TZOFFSET_PLUS_05_30'
 * - '-08:00' → '_TZOFFSET_MINUS_08_00'
 * - '+00:00' → '_TZOFFSET_PLUS_00_00'
 *
 * @returns The GraphQL-safe name, or null if not a UTC offset
 */ export const formatUtcOffset = (value)=>{
    // Match UTC offset pattern: ±HH:mm
    const match = value.match(/^([+-])(\d{2}):(\d{2})$/);
    if (!match) {
        return null;
    }
    const sign = match[1] === '+' ? 'PLUS' : 'MINUS';
    const hours = match[2];
    const minutes = match[3];
    return `_TZOFFSET_${sign}_${hours}_${minutes}`;
};

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