How to Check Date Less Than Today in Typescript?

Do you want to know how to check if a date is less than today in Typescript? In this tutorial, I have explained how to check date less than today in Typescript.

To check if a date is less than today in TypeScript, create a new Date object for today, set its time to midnight for accuracy, and compare it with your specific date also set to midnight. This approach ensures a precise comparison, accounting for any time differences within the same day.

Check Date Less Than Today in Typescript

TypeScript, an extension of JavaScript, provides robust tools and methods for handling dates. To compare dates effectively, understanding the Date object in TypeScript is important. The Date object represents a single moment in time in a platform-independent format. TypeScript enhances JavaScript’s capabilities, offering improved type checking and error catching, which is vital when working with dates.

  • Get Today’s Date: First, we need to obtain today’s date. In TypeScript, this can be done using new Date(). However, this includes the current time. To compare only the dates, we need to reset the time to midnight.
  • Reset Time to Midnight for Today’s Date: To compare only the dates and ignore the time, we set the hours, minutes, seconds, and milliseconds of today’s date to zero.
  • Convert Dates to Timestamps for Comparison: Dates can be compared by converting them to their numeric timestamp representation using the getTime() method.
  • Compare the Dates: Finally, we compare the timestamp of the date in question with today’s timestamp.
function isDateLessThanToday(dateToCompare: Date): boolean {
  // Get today's date
  const today = new Date();

  // Reset hours, minutes, seconds, and milliseconds to zero
  today.setHours(0, 0, 0, 0);

  // Convert both dates to timestamps
  const todayTimestamp = today.getTime();
  const compareTimestamp = dateToCompare.getTime();

  // Check if the date to compare is less than today
  return compareTimestamp < todayTimestamp;
}

// Example Usage
const someDate = new Date('2023-11-11');
console.log(isDateLessThanToday(someDate));

Once you run the code, you can see the output in the screenshot below.

typescript date less than today

If you prefer not to reset the time to midnight for today’s date, the process becomes slightly simpler. You can directly compare the given date with the current date and time. Here’s how you can do it:

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In this approach, you compare the current date and time (including hours, minutes, and seconds) with the date you want to check. This means the function will consider any time on the current day to be “not less than today”.

Here is the complete code:

function isDateLessThanToday(dateToCompare: Date): boolean {
  // Get the current date and time
  const now = new Date();

  // Convert both dates to timestamps for comparison
  const nowTimestamp = now.getTime();
  const compareTimestamp = dateToCompare.getTime();

  // Check if the date to compare is less than the current date and time
  return compareTimestamp < nowTimestamp;
}

// Example Usage
const someDate = new Date('2023-11-11');
console.log(isDateLessThanToday(someDate));
  • const now = new Date();: This line gets the current date and time.
  • getTime(): This method converts the dates to numeric timestamps.
  • compareTimestamp < nowTimestamp: This comparison checks if the dateToCompare is earlier than the current date and time.

Check the output in the screenshot below:

Check Date Less Than Today in Typescript

Conclusion

Comparing dates to ensure one is less than today in TypeScript involves creating date objects, manipulating them for an accurate comparison, and considering time zone differences. I hope you learned how to check date less than today in typescript.

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