How do I fix timezone issues with scheduled discounts?

I'm experiencing frustrating problems with timezone discrepancies when scheduling promotional campaigns across different regions. My Shopify store serves international customers, but when I set up time-limited discounts, they often don't trigger or expire at the exact times I intend. This leads to potential revenue loss, customer confusion, and inconsistent marketing execution. I need a comprehensive strategy to ensure my scheduled discounts work seamlessly across multiple time zones, maintaining accuracy and preventing unintended promotional gaps or overlaps.