TO_HOUR

Converts a date with time (timestamp/datetime) to a UInt8 number containing the number of the hour in 24-hour time (0-23). This function assumes that if clocks are moved ahead, it is by one hour and occurs at 2 a.m., and if clocks are moved back, it is by one hour and occurs at 3 a.m. (which is not always true – even in Moscow the clocks were twice changed at a different time).

Syntax

TO_HOUR(<expr>)

Arguments

Arguments	Description
<expr>	timestamp

Return Type

TINYINT

Examples

SELECT
    to_hour('2023-11-12 09:38:18.165575');

┌───────────────────────────────────────┐
│ to_hour('2023-11-12 09:38:18.165575') │
├───────────────────────────────────────┤
│                                     9 │
└───────────────────────────────────────┘