Merge pull request #2790 from basecamp/fix-utc-date-off-by-one

Fix off-by-one date display for UTC-negative timezone users

app/javascript/helpers/date_helpers.js

@@ -7,7 +7,7 @@ export function signedDifferenceInDays(fromDate, toDate) {
 }
 
 export function beginningOfDay(date) {
-  return new Date(date.getFullYear(), date.getMonth(), date.getDate())
+  return new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate()))
 }
 
 export function secondsToDate(seconds) {