diff --git a/indra/newview/llgroupmgr.cpp b/indra/newview/llgroupmgr.cpp
index 70eddbcdc..3bd9c3715 100644
--- a/indra/newview/llgroupmgr.cpp
+++ b/indra/newview/llgroupmgr.cpp
@@ -926,13 +926,18 @@ LLGroupMgrGroupData* LLGroupMgr::getGroupData(const LLUUID& id)
 // so that the sorter can sort by year before month before day.
 static void formatDateString(std::string &date_string)
 {
-	tm t;
-	if (sscanf(date_string.c_str(), "%u/%u/%u", &t.tm_mon, &t.tm_mday, &t.tm_year) == 3 && t.tm_year > 1900)
+	using namespace boost;
+	cmatch result;
+	const regex expression("([0-9]{1,2})/([0-9]{1,2})/([0-9]{4})");
+	if (regex_match(date_string.c_str(), result, expression))
 	{
-		t.tm_year -= 1900;
-		t.tm_mon--;
-		t.tm_hour = t.tm_min = t.tm_sec = 0;
-		timeStructToFormattedString(&t, gSavedSettings.getString("ShortDateFormat"), date_string);
+		// convert matches to integers so that we can pad them with zeroes on Linux
+		S32 year	= boost::lexical_cast<S32>(result[3]);
+		S32 month	= boost::lexical_cast<S32>(result[1]);
+		S32 day		= boost::lexical_cast<S32>(result[2]);
+
+		// ISO 8601 date format
+		date_string = llformat("%04d-%02d-%02dT00:00:00Z", year, month, day);
 	}
 }
 
diff --git a/indra/newview/llpanelgroupgeneral.cpp b/indra/newview/llpanelgroupgeneral.cpp
index ac3ecd30e..2b1bbf804 100644
--- a/indra/newview/llpanelgroupgeneral.cpp
+++ b/indra/newview/llpanelgroupgeneral.cpp
@@ -844,7 +844,11 @@ void LLPanelGroupGeneral::addMember(LLGroupMemberData* member)
 
 	item_params.columns.add().column("title").value(member->getTitle()).font/*.name*/("SANSSERIF_SMALL").font_style(style);
 
-	item_params.columns.add().column("online").value(member->getOnlineStatus()).font/*.name*/("SANSSERIF_SMALL").font_style(style);
+	static const LLCachedControl<std::string> format(gSavedSettings, "ShortDateFormat");
+	static const std::string online(LLTrans::getString("group_member_status_online"));
+	item_params.columns.add().column("online").value(member->getOnlineStatus())
+		.format(format).type(member->getOnlineStatus() == online ? "text" : "date")
+		.font/*.name*/("SANSSERIF_SMALL").font_style(style);
 
 	/*LLScrollListItem* member_row =*/ mListVisibleMembers->addNameItemRow(item_params);
 }
diff --git a/indra/newview/llpanelgroupnotices.cpp b/indra/newview/llpanelgroupnotices.cpp
index 001a1179a..39c86e307 100644
--- a/indra/newview/llpanelgroupnotices.cpp
+++ b/indra/newview/llpanelgroupnotices.cpp
@@ -455,7 +455,6 @@ void LLPanelGroupNotices::processNotices(LLMessageSystem* msg)
 		msg->getBOOL("Data","HasAttachment",has_attachment,i);
 		msg->getU8("Data","AssetType",asset_type,i);
 		msg->getU32("Data","Timestamp",timestamp,i);
-		time_t t = timestamp;
 
 		LLSD row;
 		row["id"] = id;
@@ -480,9 +479,10 @@ void LLPanelGroupNotices::processNotices(LLMessageSystem* msg)
 		std::string format(gSavedSettings.getString("ShortDateFormat"));
 		if (gSavedSettings.getBOOL("LiruGroupNoticeTimes"))
 			format += " " + gSavedSettings.getString("ShortTimeFormat");
-		timeToFormattedString(t, format, buffer);
+		row["columns"][3]["type"] = "date";
+		row["columns"][3]["format"] = format;
 		row["columns"][3]["column"] = "date";
-		row["columns"][3]["value"] = buffer;
+		row["columns"][3]["value"] = LLDate(timestamp);
 
 		buffer = llformat( "%u", timestamp);
 		row["columns"][4]["column"] = "sort";
diff --git a/indra/newview/llpanelgrouproles.cpp b/indra/newview/llpanelgrouproles.cpp
index 2a540e1c1..d713ff9e8 100644
--- a/indra/newview/llpanelgrouproles.cpp
+++ b/indra/newview/llpanelgrouproles.cpp
@@ -50,6 +50,7 @@
 #include "lltabcontainer.h"
 #include "lltextbox.h"
 #include "lltexteditor.h"
+#include "lltrans.h"
 #include "llviewertexturelist.h"
 #include "llviewerwindow.h"
 #include "llfocusmgr.h"
@@ -1536,7 +1537,10 @@ void LLPanelGroupMembersSubTab::addMemberToList(LLGroupMemberData* data)
 	item_params.columns.add().column("donated").value(donated.getString())
 			.font/*.name*/("SANSSERIF_SMALL")/*.style("NORMAL")*/;
 
+	static const LLCachedControl<std::string> format(gSavedSettings, "ShortDateFormat");
+	static const std::string online(LLTrans::getString("group_member_status_online"));
 	item_params.columns.add().column("online").value(data->getOnlineStatus())
+			.format(format).type(data->getOnlineStatus() == online ? "text" : "date")
 			.font/*.name*/("SANSSERIF_SMALL")/*.style("NORMAL")*/;
 	mMembersList->addNameItemRow(item_params);