Update realtime chart.

lib/date.js

@@ -7,6 +7,7 @@ import {
   addYears,
   subHours,
   subDays,
+  startOfMinute,
   startOfHour,
   startOfDay,
   startOfWeek,
@@ -17,6 +18,7 @@ import {
   endOfWeek,
   endOfMonth,
   endOfYear,
+  differenceInMinutes,
   differenceInHours,
   differenceInCalendarDays,
   differenceInCalendarMonths,
@@ -114,6 +116,7 @@ export function getDateFromString(str) {
 }
 
 const dateFuncs = {
+  minute: [differenceInMinutes, addMinutes, startOfMinute],
   hour: [differenceInHours, addHours, startOfHour],
   day: [differenceInCalendarDays, addDays, startOfDay],
   month: [differenceInCalendarMonths, addMonths, startOfMonth],