PEXPIRETIME has the same semantic as EXPIRETIME, but returns the absolute Unix expiration timestamp in milliseconds instead of seconds.
Examples
127.0.0.1:6379> SET mykey "Hello"
OK
127.0.0.1:6379> PEXPIREAT mykey 33177117420000
(integer) 1
127.0.0.1:6379> PEXPIRETIME mykey
(integer) 33177117420000