Total Bitcoins in circulation on any given day?
From command line the piping to date command needs a 2nd eye.  Bit late for me here, but it's a unix timestamp conversion to whatever format you want.

You can find out by:


getting the hash of each block at height X using the RPC or bitcoin-cli getblockhash X
using the blockhash to get information about that block using RPC or bitcoin-cli getblock &lt;HASH&gt;
get the timestamp of that block
convert timestamp into the date format you want
get the first transaction of the block (coinbase transaction) for the amount of newly mined coins using RPC or bitcoin-cli gettransaction &lt;TX&gt;


And run it through every block in a loop.

e.g.

bitcoin-cli getblockhash 1
00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048

 bitcoin-cli getblock 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048 | jq '.time' | date 
Mon Jun  3 18:54:45 UTC 2019

bitcoin-cli getrawtransaction `bitcoin-cli getblock 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048 | jq -r '.tx[0]'` true | jq '.vout[0].value'
50


Here is block #1 on a btc explorer showing the same data, 50 new coins.

You can loop like that on command line but probably better to do with RPC and a real programming language.