Month in lower case Roman numerals (i–xii i=January) Month in upper case Roman numerals (I–XII I=January) Julian Date (integer days since NovemBC at local midnight see Section B.7)
#Postgresql datediff milliseconds iso#
Week number of ISO 8601 week-numbering year (01–53 the first Thursday of the year is in week 1)Ĭentury (2 digits) (the twenty-first century starts on ) Week number of year (1–53) (the first week starts on the first day of the year) Week of month (1–5) (the first week starts on the first day of the month) ISO 8601 day of the week, Monday ( 1) to Sunday ( 7) Last digit of ISO 8601 week-numbering yearįull upper case month name (blank-padded to 9 chars)įull capitalized month name (blank-padded to 9 chars)įull lower case month name (blank-padded to 9 chars)Ībbreviated upper case month name (3 chars in English, localized lengths vary)Ībbreviated capitalized month name (3 chars in English, localized lengths vary)Ībbreviated lower case month name (3 chars in English, localized lengths vary)įull upper case day name (blank-padded to 9 chars)įull capitalized day name (blank-padded to 9 chars)įull lower case day name (blank-padded to 9 chars)Ībbreviated upper case day name (3 chars in English, localized lengths vary)Ībbreviated capitalized day name (3 chars in English, localized lengths vary)Ībbreviated lower case day name (3 chars in English, localized lengths vary)ĭay of ISO 8601 week-numbering year (001–371 day 1 of the year is Monday of the first ISO week)ĭay of the week, Sunday ( 1) to Saturday ( 7) Last 2 digits of ISO 8601 week-numbering year Last 3 digits of ISO 8601 week-numbering year ISO 8601 week-numbering year (4 or more digits) (See also to_timestamp(double precision) in Table 9.33.) To_timestamp ( text, text ) → timestamp with time zoneĬonverts string to time stamp according to the given format. To_char(interval '15h 2m 12s', 'HH24:MI:SS') → 15:02:12Ĭonverts number to string according to the given format available for integer, bigint, numeric, real, double precision.Ĭonverts string to date according to the given format.Ĭonverts string to numeric according to the given format. To_char(timestamp ' 17:31:12.66', 'HH12:MI:SS') → 05:31:12Ĭonverts interval to string according to the given format. So that way we can take into account any unit.To_char ( timestamp with time zone, text ) → textĬonverts time stamp to string according to the given format. I have created a datediff function that does almost everything sql server does. I would like to expand on Riki_tiki_tavi's answer and get the data out there. datediff(yy, '', '') = 2 // 2 changes of year
datediff(mm, '', '') = 23 // 23 changes of month datediff(dd`, '', '') = 704 // 704 changes of day in this interval The following are my best attempt at replicating the logic correctly. There is less than 2 years between those dates, meaning only 1 whole year has passed, but 2 year boundaries have crossed, from 2010 to 2011, and from 2011 to 2012. That's why datediff(yy, '', '') is 2, and not 1. Not how many days, months, or years it is between them. That means how many day boundaries, month boundaries, or year boundaries, are crossed. This function returns the count (as a signed integer value) of the specified datepart boundaries crossed between the specified startdate and enddate. The asker wants to get the same result as for when running the MS SQL Server function DATEDIFF ( datepart, startdate, enddate ) where datepart takes dd, mm, or yy. First lets understand the question fully.
#Postgresql datediff milliseconds full#
This question is full of misunderstandings. SELECT datediff('month', ''::date, NOW()::date) * Get months count between specified and current date */ SELECT datediff('year', ''::date, ''::date) SELECT datediff('month', ''::date, ''::date)
Usage: /* Get months count between two dates */ RETURN date_part('year', age) * 12 + date_part('month', age) RETURN date_part('year', date_to) - date_part('year', date_from) Almost the same function as you needed (based on atiruz's answer, shortened version of UDF from here) CREATE OR REPLACE FUNCTION datediff(type VARCHAR, date_from DATE, date_to DATE) RETURNS INTEGER LANGUAGE plpgsql
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