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postgresql date_trunc to arbitrary precision?

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0

postgresql has date_trunc that can truncate the time stamp value to a specific unit, like hour or minute. I want to know if there's any build-in function that would allow me to truncate to 10 minutes?

I know one trick is to convert the time stamp to epoch, do some math, then convert back. But I don't like it.

postgresql

share|improve this question

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

add a comment | 

0

postgresql has date_trunc that can truncate the time stamp value to a specific unit, like hour or minute. I want to know if there's any build-in function that would allow me to truncate to 10 minutes?

I know one trick is to convert the time stamp to epoch, do some math, then convert back. But I don't like it.

postgresql

share|improve this question

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

add a comment | 

postgresql has date_trunc that can truncate the time stamp value to a specific unit, like hour or minute. I want to know if there's any build-in function that would allow me to truncate to 10 minutes?

I know one trick is to convert the time stamp to epoch, do some math, then convert back. But I don't like it.

postgresql

share|improve this question

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

share|improve this question

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

share|improve this question

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

asked Sep 8 '14 at 4:52

David S.David S.

5,39174579

2 Answers
2

active

oldest

votes

1

There is no function you want, but as said in postgresql wiki you can define function for youself:

CREATE OR REPLACE FUNCTION round_time_10m(TIMESTAMP WITH TIME ZONE) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + INTERVAL '10 min' * ROUND(date_part('minute', $1) / 10.0) 
$$ LANGUAGE SQL;

Generally rounding up to $2 minutes:

CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + ($2 || ' min')::INTERVAL * ROUND(date_part('minute', $1) / $2) 
$$ LANGUAGE SQL;

share|improve this answer

edited Mar 23 at 18:36

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @alex-dvortsky Thank you very much. Can you help me come up with a solution that I can use n as the round up unit? Say interval 'n min'
  
  – David S.
  Sep 9 '14 at 12:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sure. I've updated my answer for any n
  
  – Alex Dvoretsky
  Sep 12 '14 at 18:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Quick update needed: the prototype of the second function is wrong: CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) would be more accurate (edited the name, added missing second parameter)
  
  – Romain G
  Nov 22 '16 at 16:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. Fixed signature of the function
  
  – Alex Dvoretsky
  Nov 23 '16 at 13:41
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the second function seems to not actually work: jasen=# select round_time_nm(now(),10); -[ RECORD 1 ]-+----------------------- round_time_nm | 2019-03-17 23:02:00+00
  
  – Jasen
  Mar 17 at 23:12
  
  

  
  
  
  

 | 
show 1 more comment

0

here's an improved version of date_trunc

create cast (bigint as timestamptz) WITHOUT FUNCTION;
create cast (timestamptz as bigint) WITHOUT FUNCTION;
CREATE OR REPLACE FUNCTION date_trunc_by_interval( interval, timestamptz )
 RETURNS timestamptz 
 LANGUAGE SQL
 IMMUTABLE
 RETURNS NULL ON NULL INPUT
 AS $$ 
 select
 case when $2::bigint >= 0::bigint then
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 else
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 - (extract (epoch from $1)*1000000 ) ::bigint
 end ::timestamptz
$$;

this allows rounding to any fixed-length interval eg: '864 seconds' (divinding days into 100 parts) or '14 days' dividing the calendar into fortnights. the basis is '2000-01-01 00:00:00.0 +00' which is the epoch used to compute postgres
timestamp values.

it works by coercing the timestamptz value and the interval into bigints and doing integer arithmetic on them then coercing them back to timestamps

negative inputs need special handling (the case statement) as % causes rounding towards zero.

share|improve this answer

answered Mar 17 at 23:17

JasenJasen

8,64111938

add a comment | 

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1

There is no function you want, but as said in postgresql wiki you can define function for youself:

CREATE OR REPLACE FUNCTION round_time_10m(TIMESTAMP WITH TIME ZONE) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + INTERVAL '10 min' * ROUND(date_part('minute', $1) / 10.0) 
$$ LANGUAGE SQL;

Generally rounding up to $2 minutes:

CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + ($2 || ' min')::INTERVAL * ROUND(date_part('minute', $1) / $2) 
$$ LANGUAGE SQL;

share|improve this answer

edited Mar 23 at 18:36

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @alex-dvortsky Thank you very much. Can you help me come up with a solution that I can use n as the round up unit? Say interval 'n min'
  
  – David S.
  Sep 9 '14 at 12:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sure. I've updated my answer for any n
  
  – Alex Dvoretsky
  Sep 12 '14 at 18:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Quick update needed: the prototype of the second function is wrong: CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) would be more accurate (edited the name, added missing second parameter)
  
  – Romain G
  Nov 22 '16 at 16:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. Fixed signature of the function
  
  – Alex Dvoretsky
  Nov 23 '16 at 13:41
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the second function seems to not actually work: jasen=# select round_time_nm(now(),10); -[ RECORD 1 ]-+----------------------- round_time_nm | 2019-03-17 23:02:00+00
  
  – Jasen
  Mar 17 at 23:12
  
  

  
  
  
  

 | 
show 1 more comment

1

There is no function you want, but as said in postgresql wiki you can define function for youself:

CREATE OR REPLACE FUNCTION round_time_10m(TIMESTAMP WITH TIME ZONE) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + INTERVAL '10 min' * ROUND(date_part('minute', $1) / 10.0) 
$$ LANGUAGE SQL;

Generally rounding up to $2 minutes:

CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + ($2 || ' min')::INTERVAL * ROUND(date_part('minute', $1) / $2) 
$$ LANGUAGE SQL;

share|improve this answer

edited Mar 23 at 18:36

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @alex-dvortsky Thank you very much. Can you help me come up with a solution that I can use n as the round up unit? Say interval 'n min'
  
  – David S.
  Sep 9 '14 at 12:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sure. I've updated my answer for any n
  
  – Alex Dvoretsky
  Sep 12 '14 at 18:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Quick update needed: the prototype of the second function is wrong: CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) would be more accurate (edited the name, added missing second parameter)
  
  – Romain G
  Nov 22 '16 at 16:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks. Fixed signature of the function
  
  – Alex Dvoretsky
  Nov 23 '16 at 13:41
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the second function seems to not actually work: jasen=# select round_time_nm(now(),10); -[ RECORD 1 ]-+----------------------- round_time_nm | 2019-03-17 23:02:00+00
  
  – Jasen
  Mar 17 at 23:12
  
  

  
  
  
  

 | 
show 1 more comment

There is no function you want, but as said in postgresql wiki you can define function for youself:

CREATE OR REPLACE FUNCTION round_time_10m(TIMESTAMP WITH TIME ZONE) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + INTERVAL '10 min' * ROUND(date_part('minute', $1) / 10.0) 
$$ LANGUAGE SQL;

Generally rounding up to $2 minutes:

CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + ($2 || ' min')::INTERVAL * ROUND(date_part('minute', $1) / $2) 
$$ LANGUAGE SQL;

share|improve this answer

edited Mar 23 at 18:36

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

CREATE OR REPLACE FUNCTION round_time_10m(TIMESTAMP WITH TIME ZONE) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + INTERVAL '10 min' * ROUND(date_part('minute', $1) / 10.0) 
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION round_time_nm(TIMESTAMP WITH TIME ZONE, INTEGER) 
RETURNS TIMESTAMP WITH TIME ZONE AS $$ 
 SELECT date_trunc('hour', $1) + ($2 || ' min')::INTERVAL * ROUND(date_part('minute', $1) / $2) 
$$ LANGUAGE SQL;

share|improve this answer

edited Mar 23 at 18:36

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

answered Sep 8 '14 at 5:18

Alex DvoretskyAlex Dvoretsky

756518

0

here's an improved version of date_trunc

create cast (bigint as timestamptz) WITHOUT FUNCTION;
create cast (timestamptz as bigint) WITHOUT FUNCTION;
CREATE OR REPLACE FUNCTION date_trunc_by_interval( interval, timestamptz )
 RETURNS timestamptz 
 LANGUAGE SQL
 IMMUTABLE
 RETURNS NULL ON NULL INPUT
 AS $$ 
 select
 case when $2::bigint >= 0::bigint then
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 else
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 - (extract (epoch from $1)*1000000 ) ::bigint
 end ::timestamptz
$$;

this allows rounding to any fixed-length interval eg: '864 seconds' (divinding days into 100 parts) or '14 days' dividing the calendar into fortnights. the basis is '2000-01-01 00:00:00.0 +00' which is the epoch used to compute postgres
timestamp values.

it works by coercing the timestamptz value and the interval into bigints and doing integer arithmetic on them then coercing them back to timestamps

negative inputs need special handling (the case statement) as % causes rounding towards zero.

share|improve this answer

answered Mar 17 at 23:17

JasenJasen

8,64111938

add a comment | 

0

here's an improved version of date_trunc

create cast (bigint as timestamptz) WITHOUT FUNCTION;
create cast (timestamptz as bigint) WITHOUT FUNCTION;
CREATE OR REPLACE FUNCTION date_trunc_by_interval( interval, timestamptz )
 RETURNS timestamptz 
 LANGUAGE SQL
 IMMUTABLE
 RETURNS NULL ON NULL INPUT
 AS $$ 
 select
 case when $2::bigint >= 0::bigint then
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 else
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 - (extract (epoch from $1)*1000000 ) ::bigint
 end ::timestamptz
$$;

this allows rounding to any fixed-length interval eg: '864 seconds' (divinding days into 100 parts) or '14 days' dividing the calendar into fortnights. the basis is '2000-01-01 00:00:00.0 +00' which is the epoch used to compute postgres
timestamp values.

it works by coercing the timestamptz value and the interval into bigints and doing integer arithmetic on them then coercing them back to timestamps

negative inputs need special handling (the case statement) as % causes rounding towards zero.

share|improve this answer

answered Mar 17 at 23:17

JasenJasen

8,64111938

add a comment | 

here's an improved version of date_trunc

create cast (bigint as timestamptz) WITHOUT FUNCTION;
create cast (timestamptz as bigint) WITHOUT FUNCTION;
CREATE OR REPLACE FUNCTION date_trunc_by_interval( interval, timestamptz )
 RETURNS timestamptz 
 LANGUAGE SQL
 IMMUTABLE
 RETURNS NULL ON NULL INPUT
 AS $$ 
 select
 case when $2::bigint >= 0::bigint then
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 else
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 - (extract (epoch from $1)*1000000 ) ::bigint
 end ::timestamptz
$$;

this allows rounding to any fixed-length interval eg: '864 seconds' (divinding days into 100 parts) or '14 days' dividing the calendar into fortnights. the basis is '2000-01-01 00:00:00.0 +00' which is the epoch used to compute postgres
timestamp values.

it works by coercing the timestamptz value and the interval into bigints and doing integer arithmetic on them then coercing them back to timestamps

negative inputs need special handling (the case statement) as % causes rounding towards zero.

share|improve this answer

answered Mar 17 at 23:17

JasenJasen

8,64111938

create cast (bigint as timestamptz) WITHOUT FUNCTION;
create cast (timestamptz as bigint) WITHOUT FUNCTION;
CREATE OR REPLACE FUNCTION date_trunc_by_interval( interval, timestamptz )
 RETURNS timestamptz 
 LANGUAGE SQL
 IMMUTABLE
 RETURNS NULL ON NULL INPUT
 AS $$ 
 select
 case when $2::bigint >= 0::bigint then
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 else
 $2::bigint - $2::bigint % (extract (epoch from $1)*1000000 ) ::bigint 
 - (extract (epoch from $1)*1000000 ) ::bigint
 end ::timestamptz
$$;

share|improve this answer

answered Mar 17 at 23:17

JasenJasen

8,64111938

answered Mar 17 at 23:17

JasenJasen

8,64111938

answered Mar 17 at 23:17

JasenJasen

8,64111938