v3
Add helper functions
is_first_day()
Check if today is the first day
Returns: (bool) true if today is the first day, false otherwise
is_last_day()
Check if today is the last day
Returns: (bool) true if today is the last day, false otherwise
is_trade_open()
Check if trade is open
Returns: (bool) true if trade is open, false otherwise
is_trade_closed()
Check if trade is closed
Returns: (bool) true if trade is closed, false otherwise