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`PEXPIRETIME` has the same semantic as `EXPIRETIME`, but returns the absolute
Unix expiration timestamp in milliseconds instead of seconds.

@return

@integer-reply: Expiration Unix timestamp in milliseconds, or a negative value
in order to signal an error (see the description below).

- The command returns `-1` if the key exists but has no associated expiration
  time.
- The command returns `-2` if the key does not exist.

@examples

```cli
SET mykey "Hello"
PEXPIREAT mykey 33177117420000
PEXPIRETIME mykey
```