Date Calculator – Add & Subtract Days, Calculate Duration Between Dates | tolkit.me

The Date Calculator on tolkit.me is a free online tool that helps you work with dates quickly and accurately. You can add or subtract days, weeks, months or years from a given date, and calculate the exact duration between two dates in days, weeks or years.

It’s perfect for planning deadlines, projects, events, schedules, timelines or simply answering questions like “What date will it be 90 days from now?” or “How many days are left until this date?”.

Counting days on a calendar or estimating dates by hand is slow and error-prone, especially when you factor in varying month lengths and leap years. A date calculator automates this and gives you accurate results instantly.

Using the Date Calculator helps you:

• ✔️ Add or subtract days from any date
• ✔️ Find the difference between two dates in days, weeks or years
• ✔️ Plan deadlines, due dates and schedules more precisely
• ✔️ Work out project timelines and event countdowns
• ✔️ Avoid mistakes when counting days manually

The Date Calculator on tolkit.me is fast, accurate and simple — ideal for personal, school or professional use.

• 1
  Choose your mode:
  Pick between “Add / Subtract Days” or “Duration Between Two Dates” depending on what you need.
• 2
  For adding or subtracting days:
  Select a start date, enter how many days, weeks, months or years you want to add or subtract, and the calculator shows you the resulting date instantly.
• 3
  For calculating duration between dates:
  Enter a start date and an end date. The Date Calculator will show the difference in days, weeks and optionally in years and months.
• 4
  Adjust inputs and recalculate:
  Change dates or intervals as needed to compare different scenarios, like new deadlines or alternative schedules.
• 5
  Use results for planning:
  Copy or note the resulting date or duration and use it for project plans, contracts, event planning or personal reminders.