Which function would you use to obtain the hour from a timestamp?

The function used to obtain the hour from a timestamp is the HOUR function. This function takes a time value or a timestamp as an input and returns the hour portion of that time, expressed as a number ranging from 0 to 23.

For example, if the timestamp is 3:45 PM, using the HOUR function will return 15, as it represents the hour in a 24-hour format. This is particularly useful for data analysis and time-based calculations where knowing just the hour is necessary.

The other functions listed are not standard or valid functions in spreadsheet software for extracting the hour from a timestamp. Thus, while the HOUR function directly serves the purpose of retrieving the hour from a given time, the alternatives do not fulfill this function's role.