chaintime

type Service interface {
	// GenesisTime provides the time of the chain's genesis.
	GenesisTime() time.Time
	// StartOfSlot provides the time at which a given slot starts.
	StartOfSlot(slot phase0.Slot) time.Time
	// StartOfEpoch provides the time at which a given epoch starts.
	StartOfEpoch(epoch phase0.Epoch) time.Time
	// CurrentSlot provides the current slot.
	CurrentSlot() phase0.Slot
	// CurrentEpoch provides the current epoch.
	CurrentEpoch() phase0.Epoch
	// SlotToEpoch provides the epoch of the given slot.
	SlotToEpoch(slot phase0.Slot) phase0.Epoch
	// FirstSlotOfEpoch provides the first slot of the given epoch.
	FirstSlotOfEpoch(epoch phase0.Epoch) phase0.Slot
	// HardForkEpoch returns the activation epoch of the specified hard fork or far future epoch if missing.
	HardForkEpoch(ctx context.Context, hardForkName string) phase0.Epoch
}