// Package clocktime provides ClockTime (time-of-day) and ISODuration types with
// JSON, GraphQL, SQL, and text serialization.
//
// # ClockTime
//
// [ClockTime] stores HH:MM:SS without a date. Use [ParseClockTime] for strict parsing.
// Optional fields should use *ClockTime; [ClockTime.IsZero] is true only for nil pointers.
// Midnight 00:00:00 is valid—use [ClockTime.IsMidnight] to test for midnight.
//
// # ISODuration
//
// [ISODuration] wraps [time.Duration] with ISO 8601 formatting via sosodev/duration.
// SQL storage uses int64 nanoseconds; strings are also accepted on scan.
package clocktime