reported from a user: "... But I have some problems: one is that i have to use your time zone but not mine while setting the time; the other problem is that I choose time window between 8:32 to 8:42in your place (which is actually 15:32 to 15:42 in Beijing time) and 5 time points randomly selected from the 10 minutes. Unfortunately, the participant got 5 messages at the same time and one minute earlier that the given time. "
reported from a user: "... But I have some problems: one is that i have to use your time zone but not mine while setting the time; the other problem is that I choose time window between 8:32 to 8:42in your place (which is actually 15:32 to 15:42 in Beijing time) and 5 time points randomly selected from the 10 minutes. Unfortunately, the participant got 5 messages at the same time and one minute earlier that the given time. "