Công Cụ Đếm Ngày & Tính Ngày is a lightweight Chrome extension designed for quick and accurate date calculations. It allows users to determine the difference between two dates, add or subtract days from a given date, and displays the current date automatically. This tool is particularly beneficial for professionals in office settings, accounting, human resources, marketing, and SEO who need to manage deadlines and project timelines efficiently.

The extension offers key features such as calculating the difference between two dates, which identifies whether the interval is in the past or future. Users can also easily add or subtract days, with the tool accounting for leap years and varying month lengths to ensure accuracy. With a user-friendly interface and no permissions required, this tool operates fully offline, providing a fast and secure way to handle date-related tasks.