What could be causing the error message "Type 'Date' is not compatible with type 'string | number'" to appear when trying to create a date using a Date object?

My function is designed to accept a date object as input and return a new date.

function makeDate(date:Date) {
  return new Date(date); //<--error here
}
const newDate = new Date(); //
console.log(makeDate(newDate)); // Returns date object just fine

When working in Typescript with VS Code, I encountered the following error:

"Argument of type 'Date' is not assignable to parameter of type 'string | number'."

Although the official documentation states that the Date constructor can take a number (milliseconds) or a string (date string), I found no issue with creating a new date object by passing an existing date object into the Date constructor. This discrepancy leaves me puzzled since I anticipated no errors to occur.

I have attempted to search online for answers, but the information from Stack Overflow and GitHub did not address this specific situation or clarify the underlying problem (or perhaps I am misinterpreting their explanations in relation to my code).

Is it expected to receive this error message? Are there any possible solutions to resolve it?

Thank you!

Answer №1

To resolve the issue of the constructor expecting a string or number, calling getTime will rectify it

function createNewDate(date:Date) {
  return new Date(date.getTime()); //<--error occurs here
}
const freshDate = new Date(); //
console.log(createNewDate(freshDate)); // Outputs date object without any problem

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