Concepts

 

Before you work with system time, you need to understand some basic time concepts, such as time zones, Coordinated Universal Time (UTC), and daylight saving time (DST).

• Time
  Time on a system involves several time concepts, such as time zones, Coordinated Universal Time (UTC), system time, and job time. Each system or partition uses system time. System time is displayed through the time of day system value.

• Coordinated Universal Time
  Coordinated Universal Time (UTC) is a time scale that is kept by time laboratories around the world and is determined by highly precise atomic clocks. The UTC time is accurate to approximately a nanosecond (billionth of a second) per day. UTC is located at 0 degree latitude, the Prime Meridian.

• Time maintenance application
  A time maintenance application maintains the system time with an external time source.

• Time adjustment
  You can use the time adjustment function of iSeries Navigator to adjust the system time, or use a time maintenance application to adjust the system time automatically.

• Time zone
  The i5/OS^® operating system provides many time zones. You can use one of the time zones included with the system, or create your own time zones.

• Daylight saving time
  Daylight saving time (DST) is the portion of the year in which a region's local time is advanced by typically one hour from its standard official time.

 

Parent topic:

Time management

Related tasks
Setting up time management