How Can I Convert a String to a Datetime Object in JavaScript with a Custom Format?

Converting String to Datetime with Format Specification in JavaScript

In JavaScript, converting a string to a datetime object is typically done using the new Date(dateString) method. However, if the input string doesn't follow the acceptable format, you'll need a customized approach.

Custom Conversion

If the string does not adhere to the supported format, manual parsing is necessary. Regular expressions can be utilized to extract the individual components of the string. For instance, the following regular expression can be used to capture the date and time components from a string in the format 'dd.MM.yyyy HH:mm:ss':

/(\d+)\.(\d+)\.(\d+) (\d+):(\d+):(\d+)/

Using the captured components, a new Date object can be created with explicit values for year, month, date, hour, minute, and second.

Here's an example of implementing this custom conversion:

function convertToDateTime(dateString, format) {
  const matches = dateString.match(/(\d+)\.(\d+)\.(\d+) (\d+):(\d+):(\d+)/);
  if (matches) {
    return new Date(matches[3], matches[2] - 1, matches[1], matches[4], matches[5], matches[6]);
  } else {
    throw new Error("Invalid date format");
  }
}

This function can now be used to convert strings to datetime objects even when the format doesn't align with the standard Date.parse() method.

const dateTime = convertToDateTime("23.11.2009 12:34:56", "dd.MM.yyyy HH:mm:ss");

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