Natural Language to ISO 8601 Converter

This function transforms natural language date and time expressions into standardized ISO 8601 format, making it perfect for chatbots and scheduling applications. It intelligently parses various input formats including relative dates ("tomorrow", "next week"), specific times ("3pm", "15:30"), day-of-week references ("next Monday"), and absolute dates ("July 4th", "12/25/2024").

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The function handles timezone conversion, validates input accuracy, and provides smart error handling with multiple output paths for different scenarios like ambiguous inputs, past dates, or missing time specifications. It supports both European (DD-MM-YYYY) and US (MM/DD/YYYY) date formats, making it versatile for international use.

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Ideal for appointment booking systems, reminder applications, calendar integrations, and any chatbot that needs to understand when users want something scheduled. The function returns clean ISO 8601 timestamps that can be directly used with databases, APIs, and calendar systems.