Time of Day Filter
The time of day filter restricts the time use variable to a particular range of time during the day. When a time of day filter is applied, only time spent in the activities (given other filter selections) during the specified time range is returned.
By default, the entire 24-hour period of the diary is included. However, applying this filter means that the user may look at how time is spent during a given set of hours. For example, researchers may want to look at time spent between 8 a.m. and 5 p.m. on a specified set of activities.
The user should note that the diary day spans different time ranges for different years of data. Between 1965 and 1998, respondents report activities from midnight of the previous day to midnight of the interview day. In the ATUS (2003 forward), respondents report their activities from 4:00 a.m. of the previous day to 4:00 a.m. of the interview day.
If you are applying a filter that extends beyond the 4:00 a.m. to midnight time range, you should be aware of these diary day differences. Specifically, in the case of the ATUS, activities taking place between midnight and 4:00 a.m. will be drawn from the end of the diary day. By contrast, for non-ATUS surveys, activities taking place between midnight and 4:00 a.m. will be drawn from the beginning of the diary day. The extract system will correctly sum time across any selected time range, even if it is outside of a particular survey's start or end time.