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Added timezone name Wikipedia link to Datetime type

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Alexey 2021-04-21 20:35:02 +00:00
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docs/en/sql-reference/data-types/datetime.md
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@ -23,7 +23,7 @@ The point in time is saved as a [Unix timestamp](https://en.wikipedia.org/wiki/U
Timezone agnostic unix timestamp is stored in tables, and the timezone is used to transform it to text format or back during data import/export or to make calendar calculations on the values (example: `toDate`, `toHour` functions et cetera). The time zone is not stored in the rows of the table (or in resultset), but is stored in the column metadata. Timezone agnostic unix timestamp is stored in tables, and the timezone is used to transform it to text format or back during data import/export or to make calendar calculations on the values (example: `toDate`, `toHour` functions et cetera). The time zone is not stored in the rows of the table (or in resultset), but is stored in the column metadata.
A list of supported time zones can be found in the [IANA Time Zone Database](https://www.iana.org/time-zones) and also can be queried by `SELECT * FROM system.time_zones`. A list of supported time zones can be found in the [IANA Time Zone Database](https://www.iana.org/time-zones). You may also look for time zone names on [Wikipedia](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) query them by `SELECT * FROM system.time_zones`.
You can explicitly set a time zone for `DateTime`-type columns when creating a table. Example: `DateTime('UTC')`. If the time zone isn’t set, ClickHouse uses the value of the [timezone](../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-timezone) parameter in the server settings or the operating system settings at the moment of the ClickHouse server start. You can explicitly set a time zone for `DateTime`-type columns when creating a table. Example: `DateTime('UTC')`. If the time zone isn’t set, ClickHouse uses the value of the [timezone](../../operations/server-configuration-parameters/settings.md#server_configuration_parameters-timezone) parameter in the server settings or the operating system settings at the moment of the ClickHouse server start.