Extracts the requested date part as an integer value.

Deprecated aliases: datepart()



Learn more about syntax conventions.


Name Type Required Description
part string ✔️ Measurement of time to extract from date. See possible values.
date datetime ✔️ The full date from which to extract part.

Possible values of part

  • Year
  • Quarter
  • Month
  • week_of_year
  • Day
  • DayOfYear
  • Hour
  • Minute
  • Second
  • Millisecond
  • Microsecond
  • Nanosecond


An integer representing the extracted part.


week_of_year returns an integer which represents the week number. The week number is calculated from the first week of a year, which is the one that includes the first Thursday.


let dt = datetime(2017-10-30 01:02:03.7654321); 
year = datetime_part("year", dt),
quarter = datetime_part("quarter", dt),
month = datetime_part("month", dt),
weekOfYear = datetime_part("week_of_year", dt),
day = datetime_part("day", dt),
dayOfYear = datetime_part("dayOfYear", dt),
hour = datetime_part("hour", dt),
minute = datetime_part("minute", dt),
second = datetime_part("second", dt),
millisecond = datetime_part("millisecond", dt),
microsecond = datetime_part("microsecond", dt),
nanosecond = datetime_part("nanosecond", dt)


year quarter month weekOfYear day dayOfYear hour minute second millisecond microsecond nanosecond
2017 4 10 44 30 303 1 2 3 765 765432 765432100


weekofyear is an obsolete variant of week_of_year part. weekofyear was not ISO 8601 compliant; the first week of a year was defined as the week with the year's first Wednesday in it. week_of_year is ISO 8601 compliant; the first week of a year is defined as the week with the year's first Thursday in it. [For more information], see ISO 8601 week dates.