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Is there a command to get the DateTime of when bitcoind last received a block?

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No, there isn't. getblockcount can only get the number of blocks in the best chain, but not the last received block.

You might need to write a new rpc to get the last received block.

First, add a new data structure in main.cpp and record blocks received order in ProcessBlock().

Second, write a rpc to print out that data structure.

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I think people look at the bitcoind log files to see the received times. Possibly a grep on the log file might be what you need?

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What you probably want to do is set up a -blocknotify= script when you start your daemon. For example, you could echo the block hash with the %s formatter, and echo the time it was received, directing the output to a file:

./bitcoind -daemon -server -blocknotify="echo %s; date"
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If you mean the number of blocks in the entire chain, getblockcount gives you that.

The commands getinfo and getblockchaininfo also both contain "blocks" in their reply. The latter also includes "headers", which should show you a higher number than "blocks" when bitcoind has not caught up yet but has heard about a newer block.

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