How to Convert Strings to Datetime Objects in JavaScript with Custom Format Specifications?

Converting Strings to Datetimes with Format Specifications in JavaScript

Question:

How can we convert a string to a datetime object in JavaScript while specifying a format string?

Implementation:

For formats compatible with Date.parse(), the conversion can be done using the new Date(dateString) method. However, for incompatible formats, manual parsing is necessary.

Manual Parsing:

1. Regular Expression Parsing:
   Extract the individual components (year, month, date, hour, minute, second) using a regular expression tailored to the specified format.

2. Date Object Creation:
   Use explicit values for these components to create a new Date object:

   const date = new Date(year, month - 1, date, hour, minute, second);

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Example:

To convert "23.11.2009 12:34:56" with the format "dd.MM.yyyy HH:mm:ss":

const dateString = "23.11.2009 12:34:56";
const format = "dd.MM.yyyy HH:mm:ss";

// Split the string into components
const [date, time] = dateString.split(" ");
const [day, month, year] = date.split(".");
const [hour, minute, second] = time.split(":");

// Create a new date object
const dateObject = new Date(year, month - 1, day, hour, minute, second);

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