| Current: | JST — Japan Standard Time |
|---|---|
| Current Offset: | UTC/GMT +9 hours |
| Difference: | 15 hours ahead of Chicago |
1948 Time Zones - Tokyo
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
The graph above illustrates clock changes in Tokyo during 1948.
Time Changes in Tokyo Over the Years
Daylight Saving Time (DST) changes do not necessarily occur on the same date every year.
| Year | Date & Time | Abbreviation | Time Change | Offset After |
|---|---|---|---|---|
| 1925 — 1936 | No changes, UTC +9 hours all of the period | |||
| 1937 | Fri, Oct 1 at 12:00 am | JCST → JST | No offset (New TZ abbr) | UTC+9h |
| 1938 — 1947 | No changes, UTC +9 hours all of the period | |||
| 1948 | Sun, May 2 at 12:00 am | JST → JDT | +1 hour (DST start) | UTC+10h |
| Sat, Sep 11 at 2:00 am | JDT → JST | -1 hour (DST end) | UTC+9h | |
| 1949 | Sun, Apr 3 at 12:00 am | JST → JDT | +1 hour (DST start) | UTC+10h |
| Sat, Sep 10 at 2:00 am | JDT → JST | -1 hour (DST end) | UTC+9h | |
| * All times are local Tokyo time. | ||||
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Tokyo
Japan
5:55
06
pm
Friday, December 19, 2025