The TimeSerial function returns the type Variant with VarType 7 (Date). This value is stored internally as a double-precision number in the range 0 to 0.9999999999. As opposed to the DateSerial or DateValue function, where the serial date values are calculated as days relative to a fixed date, you can calculate with values returned by the TimeSerial function, but you cannot evaluate them.
TimeSerial 函数返回的数据类型是变体，其 VarType 为 7 (即日期)，并在内部将此值存储为大于 0 小于 0.9999999999 的双精度数。在 DateSerial 或 DateValue 函数中，顺序日期值的计算结果为与某个固定日期相差的天数，但对于 TimeSerial 函数，您只能利用它的返回值来进行计算，而不能计算返回值本身。