Date Functions

CURRENT_DATE
CURRENT_DATE([time_zone])
Description
Return the current date. 
Input
timezone(optional, STRING): The default timezone is UTC. You can optionally specify a time zone. 
Return Data Type
DATE
Example
CURRENT_DATE()
Result: 2021-04-26
CURRENT_DATE("America/New_York")
Result: 2021-04-25
DATE
Date(date_expression_column)
Description
Convert a string, timestamp, or datetime expression to a date variable in a "yyyy-mm-dd" format. For the timestamp inputs, you can optionally specify a time zone.
Input
A STRING, DATETIME, TIMESTAMP object or column
Return Data Type
DATE
Example
DATE("2016-12-25")
Result: 2016-12-25
DATE(DATETIME("2016-12-25 23:59:59"))
Result: 2016-12-25
DATE(TIMESTAMP("2016-12-25 05:30:00+07"), "America/Los_Angeles")
Result: 2016-12-24
EXTRACT
EXTRACT(date_part FROM date)
Description
Return a part of the date expression as an integer. 
Input
date_part: DAY, WEEK(begins on Sunday), ISOWEEK(begin on Monday), MONTH, QUARTER, YEAR, or ISOYEAR (See more details)
date: a DATE object or column
Return Data Type
DATE
Example
EXTRACT(DAY FROM DATE("2020-12-25"))
Result: 25
DATE_ADD
DATE_ADD(date, INTERVAL integer date_part)
Description
Add a specified time interval to the given date. 
Input
date_part: DAY, WEEK, MONTH, QUARTER, or YEAR (See more details)
integer: the number of date_part
date: a DATE object or column
Return Data Type
DATE
Example
DATE_ADD(DATE("2020-12-25"), INTERVAL 5 DAY)
Result: 2020-12-30
DATE_SUB
DATE_SUB(date, INTERVAL integer date_part)
Description
Add a specified time interval to the given date. 
Input
date_part: DAY, WEEK, MONTH, QUARTER, or YEAR (See more details)
integer: the number of date_part
date: a DATE object or column
Return Data Type
DATE
Example
DATE_SUB(DATE("2020-12-25"), INTERVAL 5 DAY)
Result: 2020-12-20
DATE_DIFF
DATE_DIFF(date1, date2, date_part)
Description
Return the difference between two dates (date1-date2). The difference is expressed in units of date_part. The date_part can be . 
Input
date1: a DATE object or column
date2: a DATE object or column
date_part: can be one of the following: DAY, WEEK(begins on Sunday), ISOWEEK(begins on Monday), MONTH, QUARTER, YEAR, or ISOYEAR (See more details)
Return Data Type
INTEGER
Example
DATE_DIFF(DATE("2017-10-15"), DATE("2017-10-13"), DAY)
Result: 2
DATE_TRUNC
DATE_TRUNC(date, date_part)
Description
Truncate a specific date to the start of a given unit of duration and returns a new date. The unit of duration is defined by date_part.
Input
date: a DATE object or column
date_part: can be one of the following: DAY, WEEK, WEEK(<weekday>), ISOWEEK, MONTH, QUARTER, YEAR, or ISOYEAR (See more details)
Return Data Type
DATE
Example
DATE_TRUNC(DATE( '2021-4-23'), MONTH)
Result: 2021-04-01
DATE_TRUNC(DATE('2021-4-23'), WEEK(MONDAY))
Result: 2021-04-19
DATE_FROM_UNIX_DATE
DATE_FROM_UNIX_DATE(integer)
Description
Transform a UNIX date expression (that is, the number of days since 1970-01-01) into a standard date format (yyyy-mm-dd).
Input
an INTEGER object or column
Return Data Type
DATE
Example
DATE_FROM_UNIX_DATE(18650)
Result: 2021-01-23
FORMAT_DATE
FORMAT_DATE(format, date)
Description
Transform a date variable into a string variable in a specific format. 
Input
format: a STRING expression.  To see supported format elements, visit here.
date: a DATE object or column
Return Data Type
STRING
Example
FORMAT_DATE("%b-%d-%Y", DATE("2008-12-25"))
Result: Dec-25-2008
PARSE_DATE
PARSE_DATE(format, date_expression)
Description
Convert a string to a date column according to the specified format. 
Input
format: a STRING expression.  To see supported format elements, visit here.
date_expression: a STRING object or column
Return Data Type
DATE
Example
PARSE_DATE("%A %b %e %Y", "Thursday Feb 11 2021")
Result: 2021-02-11
LAST_DAY
LAST_DAY(date, [date_part])
Description
Extract the last day of a given unit of duration for a given date. The unit of duration is defined by date_part. This is commonly used to return the last date of the month. 
Input
date_part: (optional) can be one of the following: YEAR, QUARTER, MONTH, WEEK, WEEK(), ISOWEEK, or ISOYEAR (See more details)
date: a DATE object or column
Return Data Type
DATE
Example
LAST_DAY(DATE('2021-03-25'), MONTH)
Result: 2021-03-31
LAST_DAY(DATE('2021-03-25'), WEEK)
Result; 2021-03-27
UNIX_DATE
UNIX_DATE(date)
Description
Return the number of days since 1970-01-01.
Input
a DATE object or a DATE column
Return Data Type
INTEGER
Example
UNIX_DATE(DATE("2020-12-25"))
Result: 18621
Details about date_part
Part
Description
DAYOFWEEK
The weekday from 1 to 7 with Sunday as the first day of the week.
DAY
The day of the month.
DAYOFYEAR
The day of the year.
WEEK
The week number of the date from 0 to 53. (Weeks begin with Sunday, and dates prior to the first Sunday of the year are in week 0)
WEEK(<WEEKDAY>):
The week number of the date from 0 to 53. (You can optionally specify the first weekday of a week and weeks begin with the weekday that you specified. Dates prior to the first <WEEKDAY> of the year are in week 0. Valid values for <WEEKDAY> are SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, and SATURDAY.)
ISOWEEK
Returns the ISO 8601 week number of the date from 1 to 53 with Monday as the first day of the week. (The first ISOWEEK of each ISO year begins on the Monday before the first Thursday of the Gregorian calendar year.)
MONTH
Return the month of the date.
QUARTER
Return values in the range between 1 and 4.
YEAR
Return the month of the year.
ISOYEAR
Return the ISO 8601 week-numbering year, which is the Gregorian calendar year containing the Thursday of the week to which date_expression belongs.
Supported Format Elements
Format element
Description
Example
%A
Return the full weekday name.
Tuesday
%a
Return the abbreviated weekday name.
Tue
%B
Return the full name of the month.
May
%b or %h
Return the abbreviated name of the month.
May
%C
Return the century
20
%c
Return the date and time in a format of "%a %b %e %T %Y"
Tue May 4 15:31:13 2021
%D
Return the date in a format of "%m/%d/%y".
05/04/21
%d
Return the day of the month.
04
%e
Return the day of month without leading 0.
4
%F
Return the date in a format of "%Y-%m-%d"
2021-05-04
%G
Return the ISO 8601 year with the century. The ISO 8601 year begins on the Monday before the first Thursday of the Gregorian calendar year.
2021
%g
Return the ISO 8601 year without the century. The ISO 8601 year begins on the Monday before the first Thursday of the Gregorian calendar year.
21
%H
Return the hour in the 24-hour clock (00-23).
15
%I
Return the hour in the 12-hour clock (01-12).
03
%j
Return the day of the year (001-366).
124
%k
Return the hour (0-23) in the 24-hour clock without leading 0.
15
%l
Return the hour (1-12) in the 12-hour clock without leading 0
3
%M
Return the minute of the time (00-59).
31
%m
Return the month of the date (01-12).
05
%n
Return a newline character.
​
%P
Return a lowercase "am" or "pm".
pm
%p
Return an uppercase "AM" or "PM".
PM
%Q
Return the quarter of the date (1-4).
2
%R
Return the time in a format of "%H:%M".
15:31
%r
Return the time in the 12-hour clock with AM/PM notation.
03:31:13 PM
%S
Return the second of the time (00-60).
13
%s
Return the number of seconds since 1970-01-01 00:00:00 UTC.
1620142273
%T
Return the time in a format of %H:%M:%S.
15:31:13
%t
Return a tab character.
​
%U
Return the week number (00-53) of the year. Sunday is the first day of the week
18
%u
Return the weekday of the date as 1-7. Monday is the first day of the week.
2
%V
Return the ISO 8601 week number (01-53) of the year. Monday is the first day of the week. If the week containing January 1 has four or more days in the new year, then it returns "week 1". Otherwise, it returns "week 53" of the previous year, and considers the next week as "week 1".
18
%W
Return the week number(00-53) of the year. Monday is the first day of the week.
18
%w
Return the weekday of the date as 0-6. Sunday is the first day of the week.
2
%X
Return the time in a format of "HH:MM:SS"
15:31:13
%x
Return the date in a format of "MM/DD/YY"
05/04/21
%Y
Return the year with the century
2021
%y
Return the year (00-99) without the century with an optional leading zero. Can be mixed with %C. If %C is not specified, years 00-68 are the 2000s, while years 69-99 are the1900s.
21
%Z
Return the time zone name.
UTC-5
%z
Return the offset from the Prime Meridian in the format +HHMM or -HHMM as appropriate, with positive values representing locations east of Greenwich.
\-0500
%%
Return a single "%" character.
%
%Ez
Return the RFC 3339-compatible numeric time zone (+HH:MM or -HH:MM).
\-05:00
%E#S
Return the seconds with the given number of digits of fractional precision. The "#" should be replaced by a number.
"%E3S" returns
37.021
%E*S
Return the seconds with full fractional precision.
37.021851
%E4Y
Return the year in 4 digits (0000-9999).
2021

String Functions

Datetime Functions

Last modified 1yr ago

Part	Description
DAYOFWEEK	The weekday from 1 to 7 with Sunday as the first day of the week.
DAY	The day of the month.
DAYOFYEAR	The day of the year.
WEEK	The week number of the date from 0 to 53. (Weeks begin with Sunday, and dates prior to the first Sunday of the year are in week 0)
WEEK(<WEEKDAY>):	The week number of the date from 0 to 53. (You can optionally specify the first weekday of a week and weeks begin with the weekday that you specified. Dates prior to the first <WEEKDAY> of the year are in week 0. Valid values for <WEEKDAY> are SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, and SATURDAY.)
ISOWEEK	Returns the ISO 8601 week number of the date from 1 to 53 with Monday as the first day of the week. (The first ISOWEEK of each ISO year begins on the Monday before the first Thursday of the Gregorian calendar year.)
MONTH	Return the month of the date.
QUARTER	Return values in the range between 1 and 4.
YEAR	Return the month of the year.
ISOYEAR	Return the ISO 8601 week-numbering year, which is the Gregorian calendar year containing the Thursday of the week to which date_expression belongs.

Format element	Description	Example
%A	Return the full weekday name.	Tuesday
%a	Return the abbreviated weekday name.	Tue
%B	Return the full name of the month.	May
%b or %h	Return the abbreviated name of the month.	May
%C	Return the century	20
%c	Return the date and time in a format of "%a %b %e %T %Y"	Tue May 4 15:31:13 2021
%D	Return the date in a format of "%m/%d/%y".	05/04/21
%d	Return the day of the month.	04
%e	Return the day of month without leading 0.	4
%F	Return the date in a format of "%Y-%m-%d"	2021-05-04
%G	Return the ISO 8601 year with the century. The ISO 8601 year begins on the Monday before the first Thursday of the Gregorian calendar year.	2021
%g	Return the ISO 8601 year without the century. The ISO 8601 year begins on the Monday before the first Thursday of the Gregorian calendar year.	21
%H	Return the hour in the 24-hour clock (00-23).	15
%I	Return the hour in the 12-hour clock (01-12).	03
%j	Return the day of the year (001-366).	124
%k	Return the hour (0-23) in the 24-hour clock without leading 0.	15
%l	Return the hour (1-12) in the 12-hour clock without leading 0	3
%M	Return the minute of the time (00-59).	31
%m	Return the month of the date (01-12).	05
%n	Return a newline character.
%P	Return a lowercase "am" or "pm".	pm
%p	Return an uppercase "AM" or "PM".	PM
%Q	Return the quarter of the date (1-4).	2
%R	Return the time in a format of "%H:%M".	15:31
%r	Return the time in the 12-hour clock with AM/PM notation.	03:31:13 PM
%S	Return the second of the time (00-60).	13
%s	Return the number of seconds since 1970-01-01 00:00:00 UTC.	1620142273
%T	Return the time in a format of %H:%M:%S.	15:31:13
%t	Return a tab character.
%U	Return the week number (00-53) of the year. Sunday is the first day of the week	18
%u	Return the weekday of the date as 1-7. Monday is the first day of the week.	2
%V	Return the ISO 8601 week number (01-53) of the year. Monday is the first day of the week. If the week containing January 1 has four or more days in the new year, then it returns "week 1". Otherwise, it returns "week 53" of the previous year, and considers the next week as "week 1".	18
%W	Return the week number(00-53) of the year. Monday is the first day of the week.	18
%w	Return the weekday of the date as 0-6. Sunday is the first day of the week.	2
%X	Return the time in a format of "HH:MM:SS"	15:31:13
%x	Return the date in a format of "MM/DD/YY"	05/04/21
%Y	Return the year with the century	2021
%y	Return the year (00-99) without the century with an optional leading zero. Can be mixed with %C. If %C is not specified, years 00-68 are the 2000s, while years 69-99 are the1900s.	21
%Z	Return the time zone name.	UTC-5
%z	Return the offset from the Prime Meridian in the format +HHMM or -HHMM as appropriate, with positive values representing locations east of Greenwich.	\-0500
%%	Return a single "%" character.	%
%Ez	Return the RFC 3339-compatible numeric time zone (+HH:MM or -HH:MM).	\-05:00
%E#S	Return the seconds with the given number of digits of fractional precision. The "#" should be replaced by a number.	"%E3S" returns 37.021
%E*S	Return the seconds with full fractional precision.	37.021851
%E4Y	Return the year in 4 digits (0000-9999).	2021