Timing and communication

This chapter describes timing services and communication services. Use timing services to determine whether the basic or extended time-of-day (TOD) clock is synchronized with an External Time Reference hardware facility (ETR¹), obtain the present date and time, convert date and time information to various formats, or for interval timing. Interval timing lets you set a time interval, test how much time is left in the interval, or cancel the interval. Use communication services to send messages to the system operator, to TSO/E terminals, and to the system log.