The Redis PERSIST command removes any existing timeout on a given key. It returns an integer reply of 1 if the timeout was removed, or 0 if the key doesn’t exist or doesn’t have an associated timeout.

In Redis, the PTTL command returns the remaining time to live of a given key, in milliseconds.

If the key doesn’t have a timeout, an integer reply of -1 is returned. If the key doesn’t exist, -2 is returned.

PTTL works the same as the TTL command, except that it returns the result in milliseconds instead of seconds.

In Redis, the TTL command returns the remaining time to live of a given key, in seconds.

If the key doesn’t have a timeout, an integer reply of -1 is returned. If the key doesn’t exist, -2 is returned.

Redis also has a PTTL command, which works the same, but returns its result in milliseconds.

The Redis PEXPIRETIME command returns the absolute Unix timestamp in milliseconds at which the given key will expire. This is the number of milliseconds since 00:00:00 UTC on 1 January 1970 until the expiry time of the key.

This works exactly the same as EXPIRETIME, but it returns the Unix timestamp in milliseconds instead of seconds.

The PEXPIRETIME command was introduced in Redis 7.0.0.

The Redis EXPIRETIME command returns the absolute Unix timestamp in seconds at which the given key will expire. This is the number of seconds since 00:00:00 UTC on 1 January 1970 until the expiry time of the key.

The EXPIRETIME command was introduced in Redis 7.0.0.

The Redis EXPIREAT command sets a timeout as a Unix timestamp on a given key. It works the same as the EXPIRE command, but with an absolute Unix timestamp instead of a time interval in seconds (which EXPIRE uses).

The Redis PEXPIREAT command sets a timeout as a Unix timestamp on a given key in milliseconds. It works the same as the EXPIREAT command, except that it sets the timeout in milliseconds instead of seconds.

It’s also similar to the PEXPIRE command, but with an absolute Unix timestamp instead of a time interval.