javascript - Set an interval for every 12 hours -

i need function run , rerun @ 12pm , 12am. i'm using vuejs if has influence.

fetch_datetime() {     axios.get('/api/core/datetime').then((response) => {         this.datetime = response.data;         this.set_interval();     }); },  set_interval() {     var current_date = new date();     var hours = current_date.gethours();     var minutes = current_date.getminutes();     var seconds = current_date.getseconds();     if(hours == 12 && minutes == 0 && seconds == 0 || hours == 0 && minutes == 0 && seconds == 0)     {         this.fetch_datetime();     } else     {         if(hours >= 12)         {             settimeout(this.fetch_datetime, (1000 * (60 - seconds) * (60 - minutes)) + (1000 * 60 * (24 - hours - 1) * 60));         } else         {             settimeout(this.fetch_datetime, (1000 * (60 - seconds) * (60 - minutes)) + (1000 * 60 * (12 - hours - 1) * 60));         }     } 

however isn't working expected , function runs , runs multiple times on hour.

here simple function can want. should fit use case (refresh after minutes) don't expect resilient on browser changes.

// takes array of hours number , function execute  function executeonhours(hours, callback) {    callback(); // first, execute once    let = new date();    const hourswithtoogle = hours.map(h => {      return {        value: h,        executedtoday: now.gethours() === h // don't run if on given hour      }    });    setinterval(() => {      = new date();      const triggers = hourswithtoogle.filter(h => {        if (!h.executedtoday && h.value === now.gethours()) {          return h.executedtoday = true;        } else if (h.value !== now.gethours()) {          h.executedtoday = false; // clean boolean on next hour        }      });      if (triggers.length) callback(); // trigger action if hours match    }, 30000); // fix precision check, here 30s  }    executeonhours([0, 12], function() {    console.log('something done');  });

if looking far more robust solution, can use later.js, claims work on browser , offer full featured cron interface, @ cost of bundle size.