ClockinSync
ClockinSync
Timezone Management Browser Extension

Stop Juggling
Timezones.

ClockinSync lives in your browser toolbar, instant timezone conversion, working hours overlap, DST alerts, and meeting reminders for your global team.

  • Live DST & public holiday warnings, zero surprises
  • Working hours overlap, see who is available instantly
  • Save profiles for Work, Clients, Team and Personal
  • Type any time in your browser to convert it on the spot
  • Cross-timezone meeting reminders that follow you
Install Free Chrome ExtensionAvailable for Chrome, Edge & Firefox
Public Holidays

Never Catch a City Off Guard

ClockinSync checks public holidays for every city in your list, a yellow 7-day heads-up and a red alert on the actual day, right on each city card. No more accidentally scheduling a meeting on a national holiday.

  • Amber warning 7 days ahead, time to reschedule
  • Red alert on the holiday itself, impossible to miss
  • Covers 100+ countries, refreshed annually
Timezone List
London
United Kingdom
--:--
New York
United States
🎉 Public Holiday — Independence Day
--:--
Tokyo
Japan
🔔 Public Holiday in 3d — Marine Day
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DST Awareness

Daylight Saving, Handled

DST shifts silently break recurring meetings. ClockinSync detects upcoming clock changes for every city in your list and warns you with a 7-day countdown, so you can adjust before the chaos hits.

  • Amber warning up to 7 days before the clock change
  • Red alert on the day itself, direction and exact time shown
  • Works for every IANA timezone or city, automatically, zero config
Timezone List
Sydney
Australia
⏰ DST Changed back 1h Today at 02:00
--:--
New York
United States
🔔 DST forward 1h at 02:00 Mar 9
--:--
London
United Kingdom
--:--
Page Annotation

Times on Any Page, Converted Instantly

ClockinSync scans every webpage for timezone references like "3pm EST" and underlines them in purple. Hover to see instant conversions for your entire team, no copy-pasting, no mental math.

  • Detects times in emails, Teams, Slack, Notion, Google Docs etc.
  • Shows all your saved cities converted in one hover
  • Green dot = in working hours  ·  Red dot = outside working hours
sample-email.comClockinSync active ✦

Hi team, weekly standup is at 3pm EST on Friday. Client presentation at 10am PST Thursday. See you then!

Hovering your mouse over “3pm EST” shows:
BASE20:00  London
12:00  Sarah · LA
21:00  Marcus · Paris
01:30 +1d  Priya · Mumbai
Timezone Shortcode

Convert Any Time While You Type

In any text field - Teams, Slack, Gmail, Notion, Google Docs, type /time followed by a time and city to see instant conversions for your whole team.

  • /time now - current time across all your cities
  • /time 3pm Tokyo or /time 15:25 London convert instantly
  • Click a result to paste the formatted time into your text field
Try it! Type a shortcode using any city with format as below
Smart Reminders

Never Miss a Meeting Across Timezones

Set meeting reminders in any timezone with a full date picker, clock, and recurrence options. ClockinSync handles DST adjustments automatically, so "9am London every Monday" always rings at the right local time.

  • Full date + time picker, no manual UTC math
  • Recurring: once, daily, weekdays, weekly, monthly
  • Pre-alerts: get a 10m, 15m, or 1h heads-up
  • DST-aware, reminders stay correct after clocks change
Add Reminder
May 11, 2026
May 2026
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09:00
LondonEurope/London