Activity stream date format does not use configured format

Top item in the activity stream is under heading "October 05 - 10:00 PM"

Our date formats:
Format Example
Time Format kk:mm 'UTC' 14:41 UTC
Day Format EEEE kk:mm 'UTC' Tuesday 14:41 UTC
Complete Date/Time Format yyyy-MM-dd kk:mm 'UTC' 2009-10-06 14:41 UTC
Day/Month/Year Format yyyy-MM-dd 2009-10-06
Date Picker Format (javascript format) d/MMM/yy (%e/%b/%y) 6/Oct/09
Date Time Picker Format (javascript format) dd/MMM/yy hh:mm a (%e/%b/%y %I:%M %p) 06/Oct/09 02:41 PM

Note

Streams currently uses different formats for time an date:

• Time. It is always the value specified in the field "Time Format" in the Look & Feel config page. The time if not displayed if the date is today.
• Date. It varies, depending on the actual date:
  • For today's dates:
    • < 1 minute: "Moments ago"
    • < 2 minutes: "1 minute ago"
    • < 1 hour: "X minutes ago"
    • < 2 hours: "1 hour ago"
    • < 1 day: "X hours ago"
  • Yesterday: "Yesterday at time"
  • Last week: "dddd at time" (eg. Sunday at 09:00 am)
  • Last year: "m at time" (eg. 11 May at 09:00 am)
  • Older: "D at time" (eg. Sunday, 11 May 2014 at 09:00 am)

The time & date format specifiers are documented below:

• https://code.google.com/p/datejs/wiki/FormatSpecifiers#CUSTOM_DATE_AND_TIME_FORMAT_SPECIFIERS
• https://code.google.com/p/datejs/wiki/FormatSpecifiers#STANDARD_DATE_AND_TIME_FORMAT_SPECIFIERS

Note: the format specifier a is translated to tt, so the default time format (h:mm a) is actually interpreted as (h:mm tt)