Currently Business Process Server supports 24 hour time format only for the locales other than English. The bpmportal.properties file contains the following keys for the date and time format.
dateFormat=yyyy/MM/dd HH:mm:ss
date_format=yyyy/MM/dd
Portal.DateOnlyFormat=yyyy/MM/dd
Portal.TimeOnlyFormat=HH:mm:ss
You must update these values considering the following points.
The value of the dateFormat key must be equal to the combination of values of the Portal.DateOnlyFormat and Portal.TimeOnlyFormat keys.
The value of the date_format key must be equal to the value of the Portal.DateOnlyFormat key.