Then WeekDay returns 5, which corresponds to Thursday. (Assume the current date is Wednesday, July 5, 2009.)įirst the DateAdd function adds one day to the current date, resulting in a date of Thursday, July 6, 2009. The DayName function extracts the name of the day of the week from a given date. Week start and end date for a given date Hi Tom,I want the sql to get the start of the week date and end of the week date for a given date and my week starts from saturday and ends with friday. WeekDay is most often used with the DayName function. The system returns the number of the day of the week, from 1 to 7, as shown here: 1 Answer Active Oldest Votes 5 Reason is the format WW where. Getting the Week Number From Any Date Baeldung The function in fact iteratively adds calendar days to the starting days, keeps track of the number of actual added business days, until the required number of business days is added. If the Locale INI option offers no value, the system defaults to USD (United States/English). View each week to see all the date in that week. If you omit this parameter, the system checks the Locale INI option. The default is the current date.Įnter a valid date format that describes the format used by your entry in the Date parameter. The system assumes your entry is in the format specified by the Format parameter. Use this function to determine the day of the week in a given date and return the value as a number.
By moving the anchor date slightly, you can hardcode any day as the first day of a week.Ĭorrection to your example: if today is 02/mar/2018 then start date is 24/feb/2018 but end date is 02/mar/2018, not 03/mar/2018.You are here: Function Reference > Alphabetical Listing > W > WeekDay WeekDay
ORACLE WEEK NUMBER STARTING SUNDAY PLUS
The end date is obviously the start date plus 6 days. This offset is subtracted from today, giving the closest Saturday before today. (You could use any Saturday before your oldest "today" as the anchor.) The modulo (MOD) expression returns 0 if today is Saturday, 1 if it is Sunday, etc. Here's the expression: DATEADD (week, DATEDIFF (week, -1, RegistrationDate), -1) AS Sunday The function DATEADD () takes three arguments: a datepart, a number, and a date. We'll start with Sunday, since it is easier to explain. The above query uses the Julian date (2415026) of the first Saturday in the 20th century (January 6th, 1900) as an anchor point. Option 1: Sunday as the First Day of the Week. If you want to hardcode the week start to Saturday and make it independent of NLS settings, then you need to do some more complex date arithmetic, because TRUNC does not accept NLS_TERRITORY as a direct parameter: It will start on Saturday in Arabic countries.
ORACLE WEEK NUMBER STARTING SUNDAY ISO
The above query adapts to the week definition for a given territory: the week will start on Sunday in US and on Monday in Europe. Before you start doing that, you need to define your 'rules' for Week Number - the ISO specification lays them down very solidly for Monday weeks: ISO week date - Wikipedia and is heavily dependant on the week in which the Thursday falls - and as a result an 'ISO year' can have between 364 and 371 days depending on the first Thursday of the 'calendar' week - meaning that Jan 1st can be in. If you can control the NLS territory setting (or even better: you want to adapt to it), then the simplest solution is to use TRUNC(SYSDATE,'D') and TRUNC(SYSDATE,'D')+6 :Īlter session set nls_territory='saudi arabia' įrom (select date ''+level today from dual connect by level<=10)
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