Redis - How to expire key daily

Question

I know that EXPIREAT in Redis is used to specify when a key will expire. My problem though is that it takes an absolute UNIX timestamp. I'm finding a hard time thinking about what I should set as an argument if I want the key to expire at the end of the day.

This is how I set my key:

client.set(key, body);

So to set the expire at:

client.expireat(key, ???);

Any ideas? I'm using this with nodejs and sailsjs Thanks!

Sanatory

which redis npm module you are using ,is that all redis npm module support expireat() function. ? – Arlaarlan

Answer 1

If you want to expire it 24 hrs later

client.expireat(key, parseInt((+new Date)/1000) + 86400);

Or if you want it to expire exactly at the end of today, you can use .setHours on a new Date() object to get the time at the end of the day, and use that.

var todayEnd = new Date().setHours(23, 59, 59, 999);
client.expireat(key, parseInt(todayEnd/1000));

Color

where is it documented? – Ligature

I did not manage to find this anywhere documented? How did you find this? – Thermosphere

Is expiresat sync or async? I have a lot of questions – Thermosphere

@Color is the + sign in front of new Date really required? – Hatband

How to set expiration never in redis ? – Crankshaft

How about Date.now() instead of +new Date/1000? – Garris

Here is the Node Docs: redis.js.org/#node-redis-usage-redis-commands – Timisoara

Answer 2

Since SETNX, SETEX, PSETEX are going to be deprecated in the next releases, the correct way is:

client.set(key, value, 'EX', 60 * 60 * 24, callback);

See here for a detailed discussion on the above.

Tartarus

Answer 3

For new version ^4.6.7, you have can use set and expire like

await client.set(key , value, {EX: 60*60*24})

EX should be set in seconds (eg: 60 * 60 * 24 seconds = 1 day)

Delouse

This is the correct way at least for versions ^4.6.7 – Tannenberg

yes, also for me this worked but the other options did not – Berber

This is the one that works for the latest version of redis-npm. Docs: redis.js.org/#node-redis-usage-redis-commands – Timisoara

Answer 4

You can set value and expiry together.

  //here key will expire after 24 hours
  client.setex(key, 24*60*60, value, function(err, result) {
    //check for success/failure here
  });

 //here key will expire at end of the day
  client.setex(key, parseInt((new Date().setHours(23, 59, 59, 999)-new Date())/1000), value, function(err, result) {
    //check for success/failure here
  });

Wendel

its work but better to ignore this command .. because in redis document :" Note: Since the SET command options can replace SETNX, SETEX, PSETEX, it is possible that in future versions of Redis these three commands will be deprecated and finally removed. " redis set command – Schroder