I have a second-by-second data. I want to choose an observation every 5 minutes. If the data stops at 16:42:02 which is less than 17:30:00, I want to copy the final observation until 17:30:00. However there are actually no observations after 16:42:02 for this day. I have this kind of data for many days. Each day stops at a random time before 17:30:00. Could anyone help me? Thanks in advance.
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