node.js - Redis - How to expire key daily -

i know expireat in redis used specify when key expire. problem though takes absolute unix timestamp. i'm finding hard time thinking should set argument if want key expire @ end of day.

this how set key:

client.set(key, body);

so set expire at:

client.expireat(key, ???);

any ideas? i'm using nodejs , sailsjs thanks!

if want expire 24 hrs later

client.expireat(key, parseint((+new date)/1000) + 86400); 

or if want expire @ end of today, can use .sethours on new date() object time @ end of day, , use that.

var todayend = new date().sethours(23, 59, 59, 999); client.expireat(key, parseint(todayend/1000));