For example: the user’s browser is in the US time zone. A1 and A2 in the form are all date fields in the format yyyy/MM/dd, the value of A1 is 2020/10/31, and the value of A2 is 2020/11/02. Applying the formula "A2-A1" to A3, you will find that A3’s result is "2.0416667" instead of the expected "2". This is because 2020/10/31 is the daylight saving time in the United States whereas 2020/11 /02 is no longer daylight saving time, so there will be a difference of 0.0416667 days (equal to 1 hour). At this time, the formula should be changed to ROUND(A2-A1) to obtain an integer result.