Exploring date comparisons in TypeScript and Angular 4

I'm currently working on a comparison of dates in typescript/angular 4. In my scenario, I've stored the system date in a variable called 'today' and the database date in a variable named 'dateToBeCheckOut'. My goal was to filter out bookings where the checkout date is earlier than today's date. However, I'm encountering unexpected results instead of the desired output. Below is the code snippet I used, and I'm seeking assistance in understanding why this discrepancy occurs.

Here's the code:

for(let k = 0; k < this.bookingDetailsArrayRealObject.length; k++){
        let dateCheckOut = this.bookingDetailsArrayRealObject[k].package.chackout;
        let dateToBeCheckOut = new Date(dateCheckOut);
        let today = new Date(Date.parse(Date()));
        //let today_test = new Date();
        if(this.bookingDetailsArrayRealObject[k].status){
          if(dateToBeCheckOut.toDateString() < today.toDateString()){
            this.bookingIdsToBeUpdated.push(this.bookingDetailsArrayRealObject[k]._id);
            window.alert('true');
            console.log(today.toDateString());
            console.log(dateToBeCheckOut.toDateString());
            console.log(this.bookingDetailsArrayRealObject[k]);
          }
        }
      }

Click here to view the booking object retrieved from the database

View the console result here

The third line in the console result is not as expected based on the if statement conditions. Any suggestions or insights would be greatly appreciated.

angulartypescript

Answer №1

Comparing date objects directly is possible without converting them to strings. Here's an example:

for(let index = 0; index < this.bookingDetailsArrayRealObject.length; index++){
        let checkOutDate = this.bookingDetailsArrayRealObject[index].package.checkout;
        let dateToCheckOut = new Date(checkOutDate);
        let currentDate = new Date();
        
        if(this.bookingDetailsArrayRealObject[index].status){
          if(dateToCheckOut < currentDate){
            this.bookingIdsToUpdate.push(this.bookingDetailsArrayRealObject[index]._id);
            window.alert('true');
            console.log(currentDate.toDateString());
            console.log(dateToCheckOut.toDateString());
            console.log(this.bookingDetailsArrayRealObject[index]);
          }
        }
      }

Answer №2

Have you considered looking into the timezone settings for your date objects during runtime?

I've encountered issues with handling local (browser) date/time and database (server) date/times due to different timezones.

For example: The database sends a date in UTC format "20190621T00:00:00" without timezone information in ISO-8601 format. When I converted this information using Date("20190621T00:00:00") into a Date object, things got interesting.

Since my computer was not set to the UTC timezone but rather +02:00, "Date()" automatically used my computer's timezone if none was specified.

As a result, my Date-Object ended up representing the date/time as "20190621T00:00:00+02:00", which differs from what the database intended to provide as "20190621T00:00:00+00:00".

This led to some amusing situations where the database log entries seemed to come from the future :-)

Consider trying something like:

let databaseDate = new Date(Date.UTC(sourceDate));
let localDate = new Date(Date.UTC());

This might help resolve your timezone-related issues.

Best regards

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