Central European Winter Time change on 25 October 2026
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Central European Winter Time change on 25 October 2026

Central European Winter Time Change

On Sunday, 25 October 2026, 03:00 CEST will change into 02:00 CET.

ISOT

On the trading day Sunday, 25 October 2026, there will be 25 trading periods for 60-minute products and 100 periods for 15-minute products.

For 60‑minute products:

  1. trading period (t.p.) corresponds to the interval 00:00 – 01:00,
  2. t.p. 01:00 – 02:00,
  3. t.p. 02:00 – 03:00 (CEST),
  4. t.p. 02:00 – 03:00 (CET),
  5. t.p. 03:00 – 04:00, and so on, up to the 25. t.p., which corresponds to 23:00 – 24:00.

For 15-minute products:

  1. trading period (t.p.) corresponds to 00:00 – 00:15,
  2. t.p. 00:15 – 00:30,
  3. t.p. 00:30 – 00:45,
  4. t.p. 00:45 – 01:00,
  5. t.p. 01:00 – 01:15,
  6. t.p. 01:15 – 01:30,
  7. t.p. 01:30 – 01:45,
  8. t.p. 01:45 – 02:00,
  9. t.p. 02:00a – 02:15a (CEST),
  10. t.p. 02:15a – 02:30a (CEST),
  11. t.p. 02:30a – 02:45a (CEST),
  12. t.p. 02:45a – 03:00a (CEST),
  13. t.p. 02:00b – 02:15b (CET),
  14. t.p. 02:15b – 02:30b (CET),
  15. t.p. 02:30b – 02:45b (CET),
  16. t.p. 02:45b – 03:00b (CET), and so on, up to the 100. trading period, which corresponds to 23:45 – 24:00.

 

Representation of trading periods at IDM Dashboard for the trading day 25 October 2026 will be as following:

  • trading hour corresponding with period 00:00 – 01:00 will be represented as „00 – 01“, or „T00-01“ during 24 October 2026,
  • trading hour corresponding with period 01:00 – 02:00 will be represented as „01 – 02a“, or „T01-02a“ during 24 October 2026,
  • trading hour corresponding with period 02:00 – 03:00 (CEST) will be represented as „02a – 02b“, or „T02a-02b“ during 24 October 2026,
  • trading hour corresponding with period 02:00 – 03:00 (CET) will be represented as „02b – 03“, or „T02b-03“ during 24 October 2026.

Other trading hours will be represented appropriately to local time (CET) and the last trading hour will be represented as following:

  • trading hour corresponding with period 23:00 – 24:00 will be represented as „23 – 24“, or „T23-24“ during 24 October 2026.

Similar change applies for 15-minute products, for which 100 values (trading periods) will be displayed, as in ISZO.

ISZO

Trading day for Sunday, 25 October 2026 will have 25 trading hours meaning that daily schedule will consist of 100 periods instead of 96. 1st – 4th period will be equal to 00:00 – 01:00, 5th – 8th period will be equal to 01:00 – 02:00 (CEST), 9th – 12th period will be equal to 02:00 – 03:00 (CEST), 13th – 16th period will be equal to 02:00 – 03:00 (CET) ... until 97th – 100th period will be equal to 23:00 – 24:00.

Intraday registration will run in 25 time sequences corresponding to the respective trading hours for Sunday, 25 October 2026. The 3rd time sequence of intraday will be equal to 02:00 – 03:00 (CEST) and the 4th time sequence of intraday will be equal to 02:00 – 03:00 (CET). Registration of changes in daily diagrams for the intraday trading hour will be closed 30 minutes before the beginning of the trading hour. Changes in daily diagrams for the intraday trading hour will be confirmed 15 minutes before the beginning of the trading hour.

ISOM/ISCF

Measurement types A and B and production sites for trading day 25 October 2026 will consist of 100 periods. In case of submission of measured values through automated interface, 12th period will have range of 202610250245-202610250200.

 

RRM

Trading day for Sunday, 25 October 2026 will have 25 trading hours. 1st trading hour will be equal to 00:00 – 01:00, 2nd trading hour will be equal to 01:00 – 02:00 (CEST), 3rd trading hour will be equal to 02:00 – 03:00 (CEST), 4th trading hour will be equal to 02:00 – 03:00 (CET)... until 25th trading hour will be equal to 23:00 – 24:00

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