Understanding JST and EET
JST stands for Japan Standard Time, UTC+9, used in Japan. EET stands for Eastern European Time, UTC+2, used in Eastern Europe in winter. These are specific offset definitions, not automatic substitutes for the local time in a city.
How do you convert JST to EET?
Subtract the source offset from the destination offset: 120 − (540) = -420 minutes. Subtract 420 minutes from the JST time. For example, 9:00 AM JST is 2:00 AM EET (same day). If the result crosses midnight, the calendar day changes too.
Does daylight saving time change this conversion?
The difference between these named offsets is fixed. A location may switch to a different abbreviation during daylight saving time, so an invitation saying “EST” can differ from the actual summer time in New York.
Japan uses JST year-round and does not observe daylight saving time.
Many EET locations switch to EEST (UTC+3) during daylight saving time.
Which day does the converted time fall on?
“Previous day” means the destination is one calendar day before the source; “Next day” means one day after. Dates are relative to the day of your input time. A time-only conversion cannot determine a specific calendar date.