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Start time on 24 hour clock


This is a 4-digit numeric variable.


CLOCKST reports the start time of the activity on the 24 hour clock.


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.


  • All activities.


  • 1965, 1975, 1985, 1993, 1995, 1998, 2003-2012


This variable has no flags.