Milo: Add timestamp name and tooltip

milo/appengine/common/funcs.go

Index: milo/appengine/common/funcs.go
diff --git a/milo/appengine/common/funcs.go b/milo/appengine/common/funcs.go
index dcf5e490dcb98d571b5832e2289f0e0ceb724cff..805ebeadc536ed3b63c0c54e330fbee212f13998 100644
--- a/milo/appengine/common/funcs.go
+++ b/milo/appengine/common/funcs.go
@@ -30,6 +30,7 @@ var funcMap = template.FuncMap{
 	"sub":            sub,
 	"consoleHeader":  consoleHeader,
 	"pagedURL":       pagedURL,
+	"formatTime":     formatTime,
 }
 
 // localTime returns a <span> element with t in human format
@@ -158,6 +159,11 @@ func parseRFC3339(s string) time.Time {
 	return time.Time{}
 }
 
+// formatTime takes a time object and returns a formatted RFC3339 string.
+func formatTime(t time.Time) string {
+	return t.Format(time.RFC3339)
+}
+
 // linkifyTemplate is the template used in "linkify". Because the template,
 // itself recursively invokes "linkify", we will initialize it in explicitly
 // in "init()".