In the Automic Web Interface a Task with status "Waiting for start time" cannot be started via Process Monitoring

Document ID : KB000092771
Last Modified Date : 07/05/2018
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Issue:
Tasks that are assigned an Earliest Start Time in a workflow and are therefore visible with the status "Waiting for start time" in the Process Monitoring view cannot be started via the context menu entry "Modify Task". 
When selecting this option an error message pop-up appears: 

 
Runtime error in object' XEXECUTEONCE (GET)', line' 00087'. No valid timestamp'' (YYYYY-MM-DD HH: MM: SS) 

Below are some screenshots which illustrate how the error can be raised:

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User-added image
Environment:
N/A
Cause:
A Time conversion problem causes Modify Task process to fail.
A timestamp value was transformed from UTC to the user-specific time-zone. This transformation is now only attempted if the timestamp is not empty.
Resolution:
Update to a fixed version listed below or a newer version if available.

Component(s):
Automic Web Interface (UI)

Fixed Version(s):
Automic Web Interface 12.1.2 - planned release date: 2018-05-23