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UTC+01:24 is an identifier for a time offset from UTC of +01:24. In ISO 8601 the associated time would be written as 2024-05-17T23:42:55+01:24.


The time corresponding to that offset was the local mean time at the Warsaw meridian and was also known as Warsaw mean time.

Since the early nineteenth century, it was commonly used for timekeeping purposes in the lands of the former Polish–Lithuanian Commonwealth.

On 5 August 1915, Warsaw switched to Central European Time,[1] and the rest of Poland followed suit on 31 May 1922.[2][3]


  1. ^ Time Changes in Warsaw Over the Years. Retrieved 9 May 2021.
  2. ^ Time Changes in Poland. Retrieved 4 May 2021.
  3. ^ Ustawa z dnia 11 maja 1922 r. o rachubie czasu. [The Act of May 11, 1922 on the Count of Time.] (in Polish). Journal of Laws 1922 No.36, item. 307. Internet System of Legal Acts. Retrieved 4 May 2021.
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