The time of day filter allows users to restrict the time use variable currently being created to a particular range of time during the day. The default selection is all times, meaning that the times spent in each of the selected activities (given other filter selections) are added together regardless of when during the day the activities occurred. When a time of day filter is applied, only time spent in the activities (given other filter selections) during the time range specified is returned. 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 respondents report their activities from 4:00 a.m. of the previous day to 4:00 a.m. of the interview day. Activities that take place between midnight and 3:59 a.m. occur at the end of the diary day. At this time, the time filter will not accept interval definitions that begin before 4:00 a.m. and end after 4:00 a.m. If you need information on activities occurring for such an interval, we recommend you create two separate variables and sum them in your statistical package.