UTC+00:20 is an identifier for a time offset from UTC of +00:20.

UTC+00:20 was used in the Netherlands from 1 May 1909 to 16 May 1940. It was known as Amsterdam Time or Dutch Time.

The exact timezone was GMT +0h 19m 32.13s until July 1, 1937, when it was simplified to GMT +0h 20m. When Germany occupied the Netherlands in World War II, Berlin Time was adopted, and this has been retained ever since.

The reason for the specific offset of +0h 19m 32.13 was that the timezone was centered on the mean solar time of the Westertoren (4°53'01,95"O), the tower of the Westerkerk church in Amsterdam.

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