No overlap — one side will join outside working hours
JST (Tokyo)
HAVANA (Havana)
00:00
11:00-1dWorking
01:00
12:00-1dWorking
02:00
13:00-1dWorking
03:00
14:00-1dWorking
04:00
15:00-1dWorking
05:00
16:00-1dWorking
06:00
17:00-1d
07:00
18:00-1d
08:00
19:00-1d
09:00Working
20:00-1doff
10:00Working
21:00-1doff
11:00Working
22:00-1doff
12:00Working
23:00-1doff
13:00Working
00:00off
14:00Working
01:00off
15:00Working
02:00off
16:00Working
03:00off
17:00
04:00
18:00
05:00
19:00
06:00
20:00
07:00
21:00
08:00
22:00
09:00Working
23:00
10:00Working
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between jst and havana?
Japan Standard Time (jst) is UTC+9 and HAVANA (Havana) (havana) is UTC-4. The difference between them is 13 hours.
Where is jst used?
Japan Standard Time (jst) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.
Where is havana used?
HAVANA (Havana) (havana) is used in Cuba and surrounding regions. The IANA timezone identifier is America/Havana.
How do I convert jst to havana?
Use the interactive converter above. Drag the time slider to any jst time and the havana equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
JST (Tokyo) is 13 hours ahead of Havana. Midday in JST (Tokyo) lines up with 23:00 in Havana.
JST (Tokyo) observes Asia/Tokyo and Havana observes America/Havana — a 13 hours gap between them.
Shared working hours
When JST (Tokyo) is in standard working hours, Havana is not — and vice versa. There is no mutual business window between these two locations.
Optimal meeting slots
No business hours overlap exists between JST (Tokyo) and Havana. Showing the most balanced options with minimal inconvenience for both locations.
05:00 Tokyo / 16:00 Havana⚡ One side off-hours
⚠️ 4h before working hours in Tokyo
09:00 Tokyo / 20:00 Havana⚡ One side off-hours
⚠️ 4h after working hours in Havana
04:00 Tokyo / 15:00 Havana⚡ One side off-hours
⚠️ 5h before working hours in Tokyo
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
JST (Tokyo)7 holidays
Jul 20Marine Day
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
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
How to work with JST (Tokyo) and Havana time zones
A 13-hour difference separates JST (Tokyo) (Japan) and Havana (Cuba) — wide enough that standard business hours don't align at all. Scheduling requires deliberate compromise from both sides.
💡 How to schedule across these time zones
⚡
05:00–06:00 in JST (Tokyo) corresponds to 16:00–17:00 in Havana (4h before working hours in Tokyo).
⚡
09:00–10:00 in JST (Tokyo) corresponds to 20:00–21:00 in Havana (4h after working hours in Havana).
⚡
04:00–05:00 in JST (Tokyo) corresponds to 15:00–16:00 in Havana (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.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any JST (Tokyo) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
