API reference# 目录 tradetime.bardelta Parameters Object Instance Obejct Attributes Object Operators tradetime.date 参数 Parameters 类属性 Class Attributes date.default_freqN date.default_freqType date.[freq] date.calendar_open/date.calendar_close/date.calendar 类方法 Class Methods date.bars date.quarter_range date.current date.future date.previous date.is_trading date.is_break date.break_type date.get_close date.get_open date.set_option 类实例 Object Instance 类实例属性 Object Attributes date.year date.quarter date.month date.day date.ignore date.freq 类实例方法 Object Methods date.index date.validate date.open date.close date.range date.is_open date.is_close date.py_date date.pd_date date.nearest 实例运算符 Object Operators Bar位移 时间位移 求差 实例比较符 Object Comparison tradetime.time