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I would like to query a range of blocks on the EOSIO mainnet which were created during a specific time span (for example, from unix time 1555500000 to 1555600000, which is around April 17-18, 2019). How do I find the numbers of the blocks created in that time span?

I see it's possible via getting various blocks with the REST API (/v1/chain/get_block), looking at the timestamp field of the responses, and performing a binary search for each of my two unix time borders. Is there a more straightforward way?

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Looks like dfuse comes to the rescue.

The /v0/block_id/by_time endpoint can be used as follows (example from the link):

curl -H "Authorization: Bearer $TOKEN" \
    "https://mainnet.eos.dfuse.io/v0/block_id/by_time?time=2019-03-04T10:36:14.5Z&comparator=gte"

Have to convert Unix time to ISO8601 extended format, but that can be automated too.

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When the blockchain operates normally, you get a new block every half a second. So you can start with any block you want and calculate the diff in seconds times 2 to get the number of blocks to diff from your initial query.

Might be off by just a few since tge real world is not mathematically precise, especially when dealing with time and networks.

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    Ideally 0.002*(d.getTime()-1528545389000) should give the latest block number (considering 1528545389000 is the timestamp when Block1 was generated) But it doesn't. Probably because BPs missed a lot of blocks on the way. So you need a source which knows about when these blocks were missed. You may consider the answer from @Gassa – mixdev Sep 24 '19 at 6:11
  • d=Date.now() BTW – mixdev Sep 24 '19 at 6:22

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