when you enter a duration of zero days for the task, microsoft project displays a distinctive diamond-shaped milestone symbol at the start of that day on the gantt chart microsoftproject将在“甘特图”上此天的开始处显示特别的菱形标记。
for example,-0.5 and 0.5 both mean noon on 30 december 1899 because a day displacement of plus or minus zero days from the base date is still the base date, and a half day displacement from midnight is noon 例如,-0.5和0.5都表示1899年12月30日正午,因为相对于基准日期加零天或减零天的日偏移量仍然是基准日期,因此偏离午夜半天的偏移量是正午。