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Find the Week from a date passed as input oracle


By : user52329
Date : September 17 2020, 09:00 AM
This might help you DB : Oracle Version : 12c , How about taking the difference in days and dividing by 7?
code :
select floor((sysdate - date '2019-11-03') / 7) + 1


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Formula to find the week no. (which week out of 52 weeks in year that date lies) from the date


By : Kaan
Date : March 29 2020, 07:55 AM
hope this fix your issue With a date in A1,:
=WEEKNUM(A1) will give the week number.....For example if A1 contains:

Calculate the week ending date in oracle using Saturday as the week end date


By : John
Date : March 29 2020, 07:55 AM
it should still fix some issue Given any particular date / time value, this expression will return midnight of the preceding Sunday.
code :
 TRUNC(whatever_time,'DAY')
 SELECT TRUNC(whatever_time,'DAY') week_starting,
        TRUNC(whatever_time,'DAY')  + 6 week_ending,
        SUM(sales)
   FROM table
  GROUP BY TRUNC(whatever_time,'DAY')
ALTER SESSION SET NLS_TERRITORY=GERMANY;
SELECT TRUNC( DATE '2013-12-31', 'DAY'),
       TRUNC( DATE '2014-01-03', 'DAY')
  FROM DUAL;

Getting the date of a specific day of week when the week is passed in as a variable


By : Chase
Date : March 29 2020, 07:55 AM
may help you . I'm trying to figure out what a date(m-d-Y) would be for a specific week. The date that I'm trying to calculate would be passed in as the day string ('monday', 'tuesday', etc...) and the week would be a PHP DatePeriod object. I will be passing in a specific date and I would like to figure out any date of that DatePeriod week. Can anyone please help me?
code :
// Making test period
$begin = new DateTime( '2015-07-20' );
$end = new DateTime( '2015-07-27' );
$interval = new DateInterval('P1D');
$daterange = new DatePeriod($begin, $interval ,$end);
// Array of day names    
$days = ['monday', 'tuesday', ... ];
// String we looking for
$string = 'tuesday';
// day of week - monday is zero  
$i = array_search($string, $days);

if ($i !== false) {
   // add i to find needed day
   echo $daterange->start->modify( "+$i day" )->format("Y-m-d");
}

How do i find number of weeks from start date to end of the current week in Oracle query?


By : user3023718
Date : March 29 2020, 07:55 AM
around this issue I always use something like following to count weeks as Change in the year of the start and end date can affect my result.
You can try the following:
code :
WITH DATE_RANGE AS (
    SELECT
        DATE '2019-12-01' START_DATE,
        DATE '2020-02-26' END_DATE
    FROM
        DUAL
)
SELECT
    COUNT(LEVEL) AS NUMBER_OF_WEEKS
--    , LEVEL   "Week",
--    TRUNC(START_DATE +(7 *(LEVEL - 1)), 'IW') AS START_OF_THE_WEEK,
--    TRUNC(START_DATE +(7 *(LEVEL - 1)), 'IW') + 6 AS END_OF_THE_WEEK,
--    TO_CHAR(START_DATE +(7 *(LEVEL - 1)), 'IW') WEEK_NUMBER
FROM
    DATE_RANGE
CONNECT BY
    LEVEL <= ( TRUNC(END_DATE, 'IW') - TRUNC(START_DATE, 'IW') ) / 7 + 1;

Output:

NUMBER_OF_WEEKS
---------------
             14

Get start and end date of a week. Month, week number, and year is given as user input


By : user3415891
Date : March 29 2020, 07:55 AM
I hope this helps you . My code should bring the date of a particular week, when the user provide the month, week number, and year. For example: If my user input is month (String) --> "October", week (Int) -- > 1, year (int) --> 2019, the above input should give the response like startDate --> 01/10/2019, endDate --> 07/10/2019. , I came up with this that fulfills your criteria I think
code :
NSInteger year = 2019;
NSInteger month = 11;
NSInteger week = 1;

NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

cal.firstWeekday = 2;

NSDateComponents *comps = [NSDateComponents new];
comps.calendar = cal;
comps.year = year;
comps.month = month;
comps.weekday = cal.firstWeekday;
comps.weekdayOrdinal = week - 1;

NSDateComponents *startOfTheMonthComps = [NSDateComponents new];
startOfTheMonthComps.year = year;
startOfTheMonthComps.month = month;
NSDateComponents *endOfTheMonthComps = [NSDateComponents new];
endOfTheMonthComps.year = year;
endOfTheMonthComps.month = month + 1;

NSDate *startOfTheMonth = [cal dateFromComponents:startOfTheMonthComps];
NSDate *endOfTheMonth = [[cal dateFromComponents:endOfTheMonthComps] dateByAddingTimeInterval:-1];

NSDate *date = [comps date];
NSDate *startOfTheWeek;
NSDate *endOfWeek;
NSTimeInterval interval;
[cal rangeOfUnit:NSCalendarUnitWeekOfYear
       startDate:&startOfTheWeek
        interval:&interval
         forDate:date];

endOfWeek = [startOfTheWeek dateByAddingTimeInterval:interval];

startOfTheWeek = [startOfTheWeek dateByAddingTimeInterval:-1];


if ([startOfTheWeek compare:startOfTheMonth] == NSOrderedAscending) {
    startOfTheWeek = startOfTheMonth;
}

if ([endOfTheMonth compare:endOfWeek] == NSOrderedAscending) {
    endOfWeek = endOfTheMonth;
}
NSLog(@"start %@", startOfTheWeek);
NSLog(@"end %@", endOfWeek);
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