import type { FunctionDefinition } from '../../definition_types';
/**
 * Rounds down a date to the closest interval since epoch, which starts at `0001-01-01T00:00:00Z`.
 *
 * @example
 * FROM employees
 * | KEEP first_name, last_name, hire_date
 * | EVAL year_hired = DATE_TRUNC(1 year, hire_date)
 *
 * @example
 * FROM employees
 * | EVAL year = DATE_TRUNC(1 year, hire_date)
 * | STATS hires = COUNT(emp_no) BY year
 * | SORT year
 *
 * @example
 * FROM sample_data
 * | EVAL error = CASE(message LIKE "*error*", 1, 0)
 * | EVAL hour = DATE_TRUNC(1 hour, @timestamp)
 * | STATS error_rate = AVG(error) by hour
 * | SORT hour
 */
declare const definition: FunctionDefinition;
export default definition;
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