Merge remote-tracking branch 'upstream/develop' into docs

* upstream/develop: (193 commits)
  fix user avatar fallback logic
  remove dead code
  make bio textarea resizable vertically only
  remove dead code
  remove dead code
  fix crazy watch logic in conversation
  show three dot button only if needed
  hide mute conversation button to guests
  update keyBy
  generate idObj at timeline level
  fix pin showing logic in conversation
  Show a message when JS is disabled
  Initialize chat only if user is logged in and it wasn't initialized before
  i18n/Update Japanese
  i18n/Update pedantic Japanese
  sync profile tab state with location query
  refactor TabSwitcher
  use better name of controlled prop
  fix potential bug to render active tab in controlled way
  remove unused param
  ...

1 files changed, 45 insertions, 0 deletions

diff --git a/src/services/date_utils/date_utils.js b/src/services/date_utils/date_utils.js
new file mode 100644
index 00000000..32e13bca
--- /dev/null
+++ b/src/services/date_utils/date_utils.js
@@ -0,0 +1,45 @@
+export const SECOND = 1000
+export const MINUTE = 60 * SECOND
+export const HOUR = 60 * MINUTE
+export const DAY = 24 * HOUR
+export const WEEK = 7 * DAY
+export const MONTH = 30 * DAY
+export const YEAR = 365.25 * DAY
+
+export const relativeTime = (date, nowThreshold = 1) => {
+  if (typeof date === 'string') date = Date.parse(date)
+  const round = Date.now() > date ? Math.floor : Math.ceil
+  const d = Math.abs(Date.now() - date)
+  let r = { num: round(d / YEAR), key: 'time.years' }
+  if (d < nowThreshold * SECOND) {
+    r.num = 0
+    r.key = 'time.now'
+  } else if (d < MINUTE) {
+    r.num = round(d / SECOND)
+    r.key = 'time.seconds'
+  } else if (d < HOUR) {
+    r.num = round(d / MINUTE)
+    r.key = 'time.minutes'
+  } else if (d < DAY) {
+    r.num = round(d / HOUR)
+    r.key = 'time.hours'
+  } else if (d < WEEK) {
+    r.num = round(d / DAY)
+    r.key = 'time.days'
+  } else if (d < MONTH) {
+    r.num = round(d / WEEK)
+    r.key = 'time.weeks'
+  } else if (d < YEAR) {
+    r.num = round(d / MONTH)
+    r.key = 'time.months'
+  }
+  // Remove plural form when singular
+  if (r.num === 1) r.key = r.key.slice(0, -1)
+  return r
+}
+
+export const relativeTimeShort = (date, nowThreshold = 1) => {
+  const r = relativeTime(date, nowThreshold)
+  r.key += '_short'
+  return r
+}