Node.js date incorrect coming from React-CodePudding

If I console log the date in Node I get the correct date:

console.log(`Date according to Node: ${new Date()}`);

Date according to Node: Mon Apr 04 2022 17:52:20 GMT 0200

However, when I send the date from React via a POST request and console log that date from the req.body I get:

2022-04-03T22:00:00.000Z

even though when logging the date from the date picker in react to console, I get the correct date! The date I get in console (React) is:

Mon Apr 04 2022 00:00:00 GMT 0200

So, what happens in between that makes req.body.myDate give me the incorrect date? I can see that my React date has no time, but not sure if that makes a difference in this case.

React:

  const onSubmit = async (data, e) => {
    var d = new Date(data.visitDate);
    d = new Date(
      `${d.getFullYear()}-${String(101   d.getMonth()).substr(1)}-${String(
        100   d.getDate()
      ).substr(1)}`
    );
    try {
      const response = await axios.post(
        "http://localhost:8000/api/v1/endpoint",
        {
          email: email,
          apptDate: d,
        }
      );
      if (response.status === 201) {
        setSuccess(true);
      }
    } catch (err) {
      setSuccess(false);
    }
  };

CodePudding user response：

It seems that React serializes the date using .toISOString() when constructing the POST request, and that always gives a date in UTC (with the Z suffix). Note that 2022-04-03T22:00:00.000Z is the same point in time as 2022-04-04T00:00:00.000 02:00.

If you want a point in time at UTC midnight, you must ensure that you create the Javascript Date as such, e.g., as new Date("2022-04-04"). By contrast, new Date() creates a Date in your browser's timezone:

new Date("2022-04-04").toISOString() === '2022-04-04T00:00:00.000Z'
new Date().toISOString() === '2022-04-03T22:00:00.000Z'

if you execute both statements at midnight in your timezone.

To get the current date in React, you can use:

var d=new Date();
new Date(`${d.getFullYear()
  }-${String(101 d.getMonth()).substr(1)
  }-${String(100 d.getDate()).substr(1)
  }`).toISOString()