Download Download Advanced Date Time Calculator v8.0 for Windows®, 718 KB


It is very easy to use.
  • Click a module button to switch to the corresponding calculator.
  • In each module, just change the editable controls (white background), the results will show instantly.

# Note

  • In the "Differences" module, if the begin time is greater than end time, the results will display as negative numbers as below:

    Negative Results

  • Algorithm For [Years] And [Months]

    [Years] = [Seconds] / 3600 / 24 / 365.25
    In above expression, 365.25 = the average days in 4 years (3 non-leap years + a leap year) = (365 * 3 + 366) / 4.

    [Months] = [Seconds] / 3600 / 24 / 30.4375
    In above expression, 30.4375 = the average days in 48 months (the months of (3 non-leap years + a leap year)) = (365 * 3 + 366) / 48.
System Requirement

Windows XP/2003/Vista/7/8/8.1/10, 32/64-bit.
Note: it contains 32 and 64-bit applications in ONE copy! You can refer to this article of our another product (Auto Mail Sender™ Birthday Edition) to know the details.


If you downloaded a self-extracting setup file (adtc.exe), just run it.
If you downloaded a zip/rar file (, please extract adtc.exe to a temporary directory, and then execute it.


Run 'Uninstall Advanced Date Time Calculator' on the related Start Menu folder or open 'Add/Remove Programs' in Control Panel and double-click 'Advanced Date Time Calculator #.#' in the list box.

Register License

If you have paid the license fee, you will get the license key INSTANTLY via email!
Please click Input license key... menu item under <License> button License Button to input or paste the license key EXACTLY as shown in your license email.
Note: if registered successfully, you can find your license information on the "About Advanced Date Time Calculator" interface.

Retrieve License Key

Lost the license key? Don't worry. It's easy to retrieve your license key of Advanced Date Time Calculator. Just click Lost license key? menu item under <License> button License Button.

Upgrade Product Version

1. Download the latest version of this product from our official website automatically if the new version is available.
2. Exit program automatically.
3. Install the latest version of this product manually (do NOT need to uninstall first, just reinstall it).

Download Download Advanced Date Time Calculator v8.0 for PC, 718 KB, Updated at Mar 20, 2018