Functions for working with date and time once long 10000 1000 datetime_transform toSecond toMinute toHour toDayOfWeek toDayOfMonth toDayOfYear toMonth toQuarter toYear toISOWeek toISOYear toStartOfMinute toStartOfFiveMinute toStartOfFifteenMinutes toStartOfHour toStartOfDay toDate toMonday toStartOfMonth toStartOfQuarter toStartOfYear toStartOfISOYear toTime toRelativeYearNum toRelativeMonthNum toRelativeWeekNum toRelativeDayNum toRelativeHourNum toRelativeMinuteNum toRelativeSecondNum toYYYYMM toYYYYMMDD toYYYYMMDDhhmmss date_transform toDayOfWeek toDayOfMonth toDayOfYear toMonth toQuarter toYear toISOWeek toISOYear toDate toMonday toStartOfMonth toStartOfQuarter toStartOfYear toStartOfISOYear toRelativeYearNum toRelativeMonthNum toRelativeWeekNum toRelativeDayNum toYYYYMM toYYYYMMDD toYYYYMMDDhhmmss time_zone UTC Europe/Moscow Asia/Kolkata SELECT count() FROM system.numbers WHERE NOT ignore(toDateTime('2017-01-01 00:00:00') + number % 100000000 + rand() % 100000 AS t, {datetime_transform}(t, '{time_zone}')) SELECT count() FROM system.numbers WHERE NOT ignore(toDate('2017-01-01') + number % 1000 + rand() % 10 AS t, {date_transform}(t))