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    use chain::BlockHeader;
    use storage::{BlockHeaderProvider, BlockAncestors};
    use primitives::hash::H256;

    /// Returns median timestamp, of given header ancestors.
    /// The header should be later expected to have higher timestamp
    /// than this median timestamp
    pub fn median_timestamp(header: &BlockHeader, store: &BlockHeaderProvider) -> u32 {
    	median_timestamp_inclusive(header.previous_header_hash.clone(), store)
    }

    /// Returns median timestamp, of given header + its ancestors.
    /// The header should be later expected to have higher timestamp
    /// than this median timestamp
    pub fn median_timestamp_inclusive(previous_header_hash: H256, store: &BlockHeaderProvider) -> u32 {
    	let mut timestamps: Vec<_> = BlockAncestors::new(previous_header_hash.clone().into(), store)
    		.take(11)
    		.map(|header| header.time)
    		.collect();

    	if timestamps.is_empty() {
    		return 0;
    	}

    	timestamps.sort();
    	timestamps[timestamps.len() / 2]
    }

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