s3-glacier-select-sql-reference-date

Date Functions

Amazon S3 Select and S3 Glacier Select support the following date functions.

Topics

DATE_ADD

Given a date part, a quantity, and a time stamp, returns an updated time stamp by altering the date part by the quantity.

Syntax

DATE_ADD( date_part, quantity, timestamp )

Parameters

date_part
Specifies which part of the date to modify. This can be one of the following:

  • year

  • month

  • day

  • hour

  • minute

  • second

    quantity
    The value to apply to the updated time stamp. Positive values for quantity add to the time stamp's date_part, and negative values subtract.

    timestamp
    The target time stamp that the function operates on.

Examples

DATE_ADD(year, 5, `2010-01-01T`) -- 2015-01-01 (equivalent to 2015-01-01T)
DATE_ADD(month, 1, `2010T`) -- 2010-02T (result will add precision as necessary)
DATE_ADD(month, 13, `2010T`) -- 2011-02T
DATE_ADD(day, -1, `2017-01-10T`) -- 2017-01-09 (equivalent to 2017-01-09T)
DATE_ADD(hour, 1, `2017T`) -- 2017-01-01T01:00-00:00
DATE_ADD(hour, 1, `2017-01-02T03:04Z`) -- 2017-01-02T04:04Z
DATE_ADD(minute, 1, `2017-01-02T03:04:05.006Z`) -- 2017-01-02T03:05:05.006Z
DATE_ADD(second, 1, `2017-01-02T03:04:05.006Z`) -- 2017-01-02T03:04:06.006Z

DATE_DIFF

Given a date part and two valid time stamps, returns the difference in date parts. The return value is a negative integer when the date_part value of timestamp1 is greater than the date_part value of timestamp2. The return value is a positive integer when the date_part value of timestamp1 is less than the date_part value of timestamp2.

Syntax

DATE_DIFF( date_part, timestamp1, timestamp2 )

Parameters

date_part
Specifies which part of the time stamps to compare. For the definition of date_part, see DATE_ADD.

timestamp1
The first time stamp to compare.

timestamp2
The second time stamp to compare.

Examples

DATE_DIFF(year, `2010-01-01T`, `2011-01-01T`) -- 1
DATE_DIFF(year, `2010T`, `2010-05T`) -- 4 (2010T is equivalent to 2010-01-01T00:00:00.000Z)
DATE_DIFF(month, `2010T`, `2011T`) -- 12
DATE_DIFF(month, `2011T`, `2010T`) -- -12
DATE_DIFF(day, `2010-01-01T23:00T`, `2010-01-02T01:00T`) -- 0 (need to be at least 24h apart to be 1 day apart)

EXTRACT

Given a date part and a time stamp, returns the time stamp's date part value.

Syntax

EXTRACT( date_part FROM timestamp )

Parameters

date_part
Specifies which part of the time stamps to extract. This can be one of the following:

  • year

  • month

  • day

  • hour

  • minute

  • second

  • timezone_hour

  • timezone_minute

    timestamp
    The target time stamp that the function operates on.

Examples

EXTRACT(YEAR FROM `2010-01-01T`) -- 2010
EXTRACT(MONTH FROM `2010T`) -- 1 (equivalent to 2010-01-01T00:00:00.000Z)
EXTRACT(MONTH FROM `2010-10T`) -- 10
EXTRACT(HOUR FROM `2017-01-02T03:04:05+07:08`) -- 3
EXTRACT(MINUTE FROM `2017-01-02T03:04:05+07:08`) -- 4
EXTRACT(TIMEZONE_HOUR FROM `2017-01-02T03:04:05+07:08`) -- 7
EXTRACT(TIMEZONE_MINUTE FROM `2017-01-02T03:04:05+07:08`) -- 8

TO_STRING

Given a time stamp and a format pattern, returns a string representation of the time stamp in the given format.

Syntax

TO_STRING ( timestamp time_format_pattern )

Parameters

timestamp
The target time stamp that the function operates on.

time_format_pattern
A string that has the following special character interpretations.
[See the AWS documentation website for more details]

Examples

TO_STRING(`1969-07-20T20:18Z`, 'MMMM d, y') -- "July 20, 1969"
TO_STRING(`1969-07-20T20:18Z`, 'MMM d, yyyy') -- "Jul 20, 1969"
TO_STRING(`1969-07-20T20:18Z`, 'M-d-yy') -- "7-20-69"
TO_STRING(`1969-07-20T20:18Z`, 'MM-d-y') -- "07-20-1969"
TO_STRING(`1969-07-20T20:18Z`, 'MMMM d, y h:m a') -- "July 20, 1969 8:18 PM"
TO_STRING(`1969-07-20T20:18Z`, 'y-MM-dd''T''H:m:ssX') -- "1969-07-20T20:18:00Z"
TO_STRING(`1969-07-20T20:18+08:00Z`, 'y-MM-dd''T''H:m:ssX') -- "1969-07-20T20:18:00Z"
TO_STRING(`1969-07-20T20:18+08:00`, 'y-MM-dd''T''H:m:ssXXXX') -- "1969-07-20T20:18:00+0800"
TO_STRING(`1969-07-20T20:18+08:00`, 'y-MM-dd''T''H:m:ssXXXXX') -- "1969-07-20T20:18:00+08:00"

TO_TIMESTAMP

Given a string, converts it to a time stamp. This is the inverse operation of TO_STRING.

Syntax

TO_TIMESTAMP ( string )

Parameters

string
The target string that the function operates on.

Examples

TO_TIMESTAMP('2007T') -- `2007T`
TO_TIMESTAMP('2007-02-23T12:14:33.079-08:00') -- `2007-02-23T12:14:33.079-08:00`

UTCNOW

Returns the current time in UTC as a time stamp.

Syntax

UTCNOW()

Parameters

none

Examples

UTCNOW() -- 2017-10-13T16:02:11.123Z
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