No overlap — one side will join outside working hours
HAVANA (Havana)
JST (Tokyo)
00:00
13:00Working
01:00
14:00Working
02:00
15:00Working
03:00
16:00Working
04:00
17:00
05:00
18:00
06:00
19:00
07:00
20:00
08:00
21:00
09:00Working
22:00off
10:00Working
23:00off
11:00Working
00:00+1doff
12:00Working
01:00+1doff
13:00Working
02:00+1doff
14:00Working
03:00+1doff
15:00Working
04:00+1doff
16:00Working
05:00+1doff
17:00
06:00+1d
18:00
07:00+1d
19:00
08:00+1d
20:00
09:00+1dWorking
21:00
10:00+1dWorking
22:00
11:00+1dWorking
23:00
12:00+1dWorking
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between havana and jst?
HAVANA (Havana) (havana) is UTC-4 and Japan Standard Time (jst) is UTC+9. The difference between them is 13 hours.
Where is havana used?
HAVANA (Havana) (havana) is used in Cuba and surrounding regions. The IANA timezone identifier is America/Havana.
Where is jst used?
Japan Standard Time (jst) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.
How do I convert havana to jst?
Use the interactive converter above. Drag the time slider to any havana time and the jst equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
Havana is 13 hours behind JST (Tokyo). When Havana clocks hit noon, JST (Tokyo) reads 01:00.
Havana runs on America/Havana; JST (Tokyo) runs on Asia/Tokyo. Together they are 13 hours apart.
Daily overlap window
There is no business hours overlap between Havana and JST (Tokyo) during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best times to schedule a meeting
Havana and JST (Tokyo) have no shared working window. These slots minimize out-of-hours disruption for both sides.
16:00 Havana / 05:00 Tokyo⚡ One side off-hours
⚠️ 4h before working hours in Tokyo
20:00 Havana / 09:00 Tokyo⚡ One side off-hours
⚠️ 4h after working hours in Havana
15:00 Havana / 04:00 Tokyo⚡ One side off-hours
⚠️ 5h before working hours in Tokyo
Working hours defined as 09:00–17:00 local time for each location.
Holiday calendar for both locations
⚡ Both locations have upcoming holidays, check availability before scheduling.
Havana5 holidays
Jul 25Day before the Commemoration of the Assault of the Moncada garrison
Jul 26Commemoration of the Assault of the Moncada garrison
Jul 27Day after the Commemoration of the Assault of the Moncada garrison
Oct 10Independence Day
Dec 25Christmas Day
JST (Tokyo)7 holidays
Jul 20Marine Day
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
Working across Havana and JST (Tokyo)
Coordinating between Havana (Cuba) and JST (Tokyo) (Japan) means working around a 13-hour time difference. Since standard business hours don't naturally overlap, meetings usually require one side to shift slightly outside their normal working day.
💡 Best practice for cross-timezone meetings
⚡
A 16:00 meeting in Havana means 05:00 in JST (Tokyo) (4h before working hours in Tokyo).
⚡
A 20:00 meeting in Havana means 09:00 in JST (Tokyo) (4h after working hours in Havana).
⚡
A 15:00 meeting in Havana means 04:00 in JST (Tokyo) (5h before working hours in Tokyo).
Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am Havana".
