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## 3.3 Managing the time 

<img src='content_image/1014840.jpg'>

This section discusses the following time modifications within a CTN and the operational requirements: 

## 3.3.1 STP time adjustment 

GLYPH<SM590000> STP time adjustment 

GLYPH<SM590000> STP offset adjustments 

GLYPH<SM590000> Changes in local time 

GLYPH<SM590000> Logical partition time offset 

GLYPH<SM590000> Parallel Sysplex and multiple time zones 

Without regular adjustment, the time on the Current Time Server drifts from its initial setting because of the frequency drift of the oscillator used to step the TOD clock. This might not meet time accuracy requirements. Therefore, adjustments might need to be made on a regular basis. 

This can be done manually or by referencing an external time source. 

Manual Adjustments of time can be performed by clicking Adjust time from the "Current time details" Panel (over the graphical topology view) in the Manage System Time task, as shown in Figure 3-26 on page 80. 

