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It looks like the calculator is defaulting missing values (like day or time) instead of requiring a full date, which causes incorrect results. If you’re only entering month and year, the tool may auto-assign a day (or apply an offset), resulting in unexpected dates like 2015 instead of 2008.

A workaround is to always enter a complete date (MM/DD/YYYY) to avoid ambiguity. You may also want to try a calculator that clearly shows how partial dates are handled, such as:
_no_links_calculatedatetime.com/

That site makes all assumptions explicit and avoids silently adjusting dates.

Dear BlueRanger,

Thank you for your suggestion.
Unfortunately our system expects a real date and not just a month and year (it shows format for the date as mm/dd/yyyy), so that's why you see strange dates. Please update your fill-up records and use 1st as a day for all fill-ups, so that date is in correct format - mm/01/yyyy. This way our system will correctly recognize your fill-up date and will store and display it correctly.
Date format is just a simple rule that our users follow to have fill-up date stored correctly.


Thanks and have a great week!