It seems like Hamro Patro, which claims to be the top and first Nepali calendar app, has a major flaw in its date calculations. The app fails to support Nepali dates prior to 2000 BS. Specifically, when trying to calculate dates from the year 1943 AD, the system fails to provide accurate Nepali date conversions.

Given that Hamro Patro markets itself as the go-to solution for online Nepali calendar needs, this is a critical issue. Users attempting to access historical data or perform date calculations for years before 2000 BS are unable to do so, which limits the app's functionality.

It seems the developers haven't accounted for the full range of Nepali calendar history, which raises questions about the app's overall reliability and usefulness. This could confuse users who trust Hamro Patro as the top online Nepali calendar resource. Please prioritize fixing this issue, so users can confidently rely on the app for date conversions from all historical periods.

Steps to Reproduce:

Open Hamro Patro webapp.

Try to convert a date from 1943 AD (or any date before 2000 BS).

Observe that the webapp either provides no result or an incorrect Nepali date.

Expected Behavior:

Hamro Patro should accurately convert and display Nepali dates for years before 2000 BS, including the year 1943 AD.

Actual Behavior:

The app fails to convert or display the correct Nepali date for the year 1943 AD.

Priority: High (since this issue impacts the core functionality of the app).