The logic supports a reliable date conversion range from 14-Apr-1987 to 15-Mar-2047. This 60-year prediction window is built using pre-computed solar and astronomical transition data, enabling precise month boundaries, year shifts, and Tamil solar calendar calculations.

For each valid Input_Date, the system determines:

• The Tamil solar month based on the Sun’s transit (Sankranti)  

• The Tamil day (Tithi equivalent in solar format) within that month  

• The Tamil Year (Panchangam-based 60-year cycle)  

• Month transitions aligned with Mesha, Vrishabha, and subsequent Sankranti events  

The conversion engine follows structured internal datasets and rules to ensure:

• No dependence on external services or internet access  

• High-speed conversion suitable for mobile and web experiences  

• Accurate Tamil calendar results for a full 60-year duration  

This module can be used for Panchangam display, festival calculations, astrology components, regional calendar utilities, and heritage-based applications requiring Tamil date representations.