JS Date Object calculate if sendout time is in less than one hour-CodePudding

I have an issue where I am not sure how to calculate if it is one hour or less between a dispatch date and the current time using the JS Date object. what I have done so far is I converted the entity.dispatchDate string into a Date object, however this case that I have written so far returns true whenever todaysDate date object is equal to or greater than the dispatch date. What I think I have to do is first of all, not use 1 hour but instead use minutes, as I need to account for every scenario that is within that hour - e.g. if its one hour before, 15 minutes, or 30 minutes to return true. What I have written so far:

// OPTIONS
const hoursBeforeSendout = 1;
// END OF OPTIONS

if(!entity.dispatchDate) {
    return false;
}
var sendDate = new Date(Date.parse(entity.dispatchDate));

Date.prototype.addHours = function(h) {
  this.setTime(this.getTime()   (h*60*60*1000));
  return this;
}

var todaysDate = new Date();
todaysDate.addHours(hoursBeforeSendout);

if(todaysDate >= sendDate) {
    return true;
}

return false;

I would appreciate any input here on what the best approach would be

CodePudding user response：

I'd suggest simply subtracting the current date (using Date.now()) from the dispatch date.

If this is under the threshold duration, it's 'due' or 'close':

function isDispatchDateClose(dispatchDate, thresholdMs = 3600 * 1000) {
    if (!dispatchDate) {
        return false;
    }
    const timeToDispatchDateMilliseconds = Date.parse(dispatchDate) - Date.now();
    return (timeToDispatchDateMilliseconds <= thresholdMs);
}

let dispatchDates = [0, 30, 45, 90, 120].map(offsetMinutes => new Date(Date.now()   offsetMinutes * 60000).toLocaleString('sv'));
console.log('Dispatch Date', '\t\t', 'Is Close ( < 1 hr to go)');
for(let dispatchDate of dispatchDates) {
    console.log(dispatchDate, '\t', isDispatchDateClose(dispatchDate))
}

.as-console-wrapper { max-height: 100% !important; top: 0; }

CodePudding user response：

If all you are wanting is to know if the dispatchDate value is within (less than) 1 hour from now, there are a few ways to do this that are fairly simple.

The simplest method would probably be

return (new Date().getTime() >= (sendDate.getTime() - 3600000)) ? true : false;

Depending on whether or not you need any additional flexibility, you could also get the time remaining in a few different forms and decide what to do from there:

// OPTIONS
const hoursBeforeSendout = 1;
// END OF OPTIONS

if(!entity.dispatchDate) {
    return false;
}
var sendDate = new Date(Date.parse(entity.dispatchDate));

let _TimeRemaining = function(d) {
  let timeRemaining = Math.floor((d.getTime() - new Date().getTime()) / 1000);
  return {"hours": Math.floor(timeRemaining / 60 / 60), "minutes": Math.floor(timeRemaining / 60), "seconds": timeRemaining}
}

console.log(_TimeRemaining(sendDate)["hours"]); // returns the hours remaining
console.log(_TimeRemaining(sendDate)["minutes"]); // returns the minutes remaining
console.log(_TimeRemaining(sendDate)["seconds"]); // returns the seconds remaining

return (_TimeRemaining(sendDate)["hours"] <= 0) true : false; // returns true if less than 1 hour