Mcseem, thank you!
For locale correction, I created 3 symbolic links:
ln -s /opt/splunk/lib/python2.7/site-packages/splunk/appserver/mrsparkle/locale/en_US /opt/splunk/lib/python2.7/site-packages/splunk/appserver/mrsparkle/locale/ru_RU
ln -s /opt/splunk/share/splunk/search_mrsparkle/exposed/js/contrib/jquery.ui.datepicker/jquery.ui.datepicker-ru.js /opt/splunk/share/splunk/search_mrsparkle/exposed/js/contrib/jquery-ui-1.10.4/i18n/jquery.ui.datepicker-ru.js
ln -s /opt/splunk/share/splunk/search_mrsparkle/exposed/js/contrib/jquery.ui.datepicker/jquery.ui.datepicker-ru.js /opt/splunk/share/splunk/search_mrsparkle/exposed/js/contrib/jquery-ui-1.10.4/i18n/jquery.ui.datepicker-ru-RU.js
After that I restarted the Splunk service.
And now time stamp and timepicker displays date, time and calendar correctly for the Russian locale.
Best regards, Artem.
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