Getting Day of the Week

I have a table with a bunch of columns with random stuff in them.
One of the columns is a date + time column that has this kind of format:
- 11-01-24 00:00:00.000000000
- 11-01-27 02:00:00.000000000
Now, as you can see, the first few numbers are the year, month, and date, the next few numbers are the hour, minutes, and second, but the last part, well, I'm honestly not too sure; I took over this database a while ago, so that format is a bit alien to me (if someone can clarify this, it'd be great; not important, though).
Given this format, is it possible to get the day of the week?
I know for some scripting and programming code, you can usually find this kind of information by using some sort of date function, but I can't seem to find one for Oracle SQL.
It would be something like:
SELECT *
FROM <table>
WHERE some_function(date_period) = 'SAT'
Thanks a lot for any feedback!

Hi,
As Centinul said, the function you want is TO_CHAR, and here's one way to use it:
WHERE   TO_CHAR ( date_period
          , 'DY'
          , 'NLS_DATE_LANGUAGE=ENGLISH'     -- If needed
          )   = 'SAT'This assumes that the data type of date_period is TIMESTAMP (or DATE).
The third argument to TO_CHAR is optional. You can skip it if you're certain that Saturday in your session is called 'Saturday', and not 'Lördag' or 'Sabado', or something in any of the other languages that Oracle supports.
You can use TO_CHAR wherever a string is allowed. For example:
SELECT TO_CHAR ( date_period
          , 'DY'
          , 'NLS_DATE_LANGUAGE=ENGLISH'     -- If needed
FROM    table_x;To see the different things that you can put in the 2nd argument to TO_CHAR, look up "format models - date" in the SQL Language manual:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/sql_elements004.htm#sthref396

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Tx
T

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2 /
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From where to get "First day of the week" data for all the locales, is it present in CLDR spec 24?

I am trying to get "First day of the week" data from CLDR spec24 but cannot find where to look for it in the spec. I need this data to calculate numeric value of "LOCAL day of the week".
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Hi
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How to pass from method to arguments to main and get the day of the week

Hi
Need some help, this code below doesnt fit the requirement.
For this program, i need to: take in day, month,year of a date as int argument, return the day of the week for the date entered in App()
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StringTokenizer is required for this program.
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Code
import java.util.*;
public class App2 {
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          else if(month2.equals("06") || month2.equals("6")){month2 = "June";}
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Note: This thread was originally posted in the [Java Programming|http://forums.sun.com/forum.jspa?forumID=31] forum, but moved to this forum for closer topic alignment.

Getting the same day of the week from a previous year in a Power Query calc column

Hi Power Query users,
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I am starting with the
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Okay, I'm making a couple of assumptions, so please let me know if these assumptions are incorrect:
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2) The previous year sales column shows the sales occurring on the same
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(date) =>
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                                   #date(9999,1,1)
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in
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Incidentally, I created this function the week before your query, for a different purpose. In that case, it was to get the previous year sales occurring on the same
date as the current year sales. It actually gets to your starting point, but with all the sales data in a single column to start with. However, when the current year is a leap year and you apply the Date.AddYears function, February 29th is calculated
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puts a truly bogus date instead of a duplicated Feb 28th - one that will always return null when looking up the sales value.
This new date column will then be used to lookup the row of the previous year sales column that corresponds to the dates in the SameDayOfWeekLastYear column.
Assuming that the last step in your query is InsertedCustom1, create another custom column (Previous Year Net_Same Day?), which returns the sales on the same day as the current year (the result that you're after). The formula would be:
LookupValue(InsertedCustom1[Previous Year Net], InsertedCustom1[Previous Year Date], [SameDayOfWeekLastYear])
where LookupValue is the custom function mentioned previously. After creating this new custom column, you can then remove all of the columns you don't need.
Hope that the preceding is somewhat clear.

Getting first day of the week

Dear All.
As there is one function module BWSO_DATE_GET_FIRST_WEEKDAY which returns the first day of the week but its Monday but in our case we require Saturday and in some cases Monday.
our user in UK are running the same report in which i have to calculate the stock base on starting day Monday and other uses are in KSA where the starting day of the week is Saturday.
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Kind regards,

Hi Zeeshan,
There are two options
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Setting the first day of the week

Hi,
Is there any other place in Mac OS X where I could set system's first day of the week, except iCal? In iCal it's set to Sunday, but in OmniFocus mini calendars show Monday as the first day of the week, although even there in OmniFocus preferences I've set it to use Sunday as the first day of the week. Developer says that OmniFocus is using system's settings, but nowhere in my system (except iCal) I can find where I could set the first day of the week. I have set English as the default language and order of list sorting in the International settings. Any ideas or suggestions?

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Issue with Gregorian Calendar and setting Day of the week

Hi
This may have a simple solution, but its currently got me stumped. Basically, after some calculation I determine the date that a particular event should occur on. These events are listed in a JTable where the column headers are the dates of the beginning of the weeks. In order to place my calculated event in the correct column I create a Gregorian Calendar, set it to the date of the event and then set the day of the week to the beginning of the week. Normally this works fine but for a few instances, rather than getting the date at the beginning of the week, I get the date thats the beginning of the next week.
As a quick example, to kind of illustrate my problem:
I determine that the date of the event is 27/06/2006 which is a Tuesday.
I want this event to appear in the column headed 25/06/2006, the date of the beginning of the week.
In fact it appears in the column headed the 02/07/2006 which is the beginning date of the following week.
Is there anyway to get it so when I set the day to the first day of the week it goes to the beginning of the current week rather than the beginning of the next week?
Any suggestions would be gratefully recieved as I'm currently struggling to think of any.
Thanks

Hi, I dont say Monday is the begining of the week. At least I dont think I do.
As for code I'll post the conversion bit which is:
for (int i = 0; i < areaNameSelectionTable.getRowCount(); i++) {
GregorianCalendar conversionCalendar = new GregorianCalendar();
conversionCalendar.setTime((java.util.Date) prioritiesTable.getValueAt(i, 10));
conversionCalendar.set(GregorianCalendar.DAY_OF_WEEK, GregorianCalendar.SUNDAY);
}//end for loopI then create a string from the GregorianCalendar in the format DD/MM/YYYY and compare that with the headers of my table columns (Also dates in the format DD/MM/YYYY) When they match thats the column this particular event should appear in. I can post this code if necessary, but I dont know if its relevant.
Thanks

Oracle returning incorrect day of the week

Hi there,
I have a table named Performance, which includes a date field named PDATE, some other attributes such as title, etc, and a field named WEEKDAY, which includes the numerical value for the day of the week. Here is an example:
PER#
P#
THEATRE#
WEEKDAY
PDATE
PHOUR
PMINUTE
COMMENTS
1
1
1
1
02-MAR-10
19
30
Normal evening time
2
1
1
2
03-MAR-10
19
30
Normal evening time
58
6
6
3
04-MAR-10
19
30
Normal evening time
5
1
1
4
05-MAR-10
19
30
Normal evening time
I went to verify the day of the week in a calendar (in fact I checked more than one) and I noticed that the Weekday value seems incorrect. For instance, the 2nd of March was a Tuesday so I would expect WEEKDAY to say 3 (considering Sunday to be the 1st day of the week, which is the universal norm), or perhaps 2 (considering Monday to be the 1st day of the week).
First thing that came to mind is, since the WEEKDAY is a number field which has been pre-populated, the person who populated it made a mistake.
So I went to verify this by running a query that would give me the correct day of the week by extracting it from the PDATE field:
SELECT DISTINCT pdate, EXTRACT(year from pdate) year,
to_char(to_date(pdate,'DD/MM/YYYY'),'DY') weekdaycalc, weekday
FROM ops$yyang00.Performance
ORDER BY pdate
And to my astonishment, I got the following table as a return:
PDATE
YEAR
WEEKDAYCALC
WEEKDAY
02-MAR-10
2010
SUN
1
03-MAR-10
2010
MON
2
04-MAR-10
2010
TUE
3
05-MAR-10
2010
WED
4
06-MAR-10
2010
THU
5
07-MAR-10
2010
FRI
6
08-MAR-10
2010
SAT
7
09-MAR-10
2010
SUN
1
10-MAR-10
2010
MON
2
As you can see, all of the above WEEKDAYCALC values are incorrect, and seem to match the incorrect values in WEEKDAY.
I could perhaps understand some weird WEEKDAY numbering if there is some general database setting where I could specify any day of the week to be the first day. However, I can't think of any logical explanation on why Oracle would call a Tuesday Sunday.
Could someone please advise what I mght be doing wrong? This is driving me insane!
Thank you in advance for all the help and support.
Regards,
P.

Hi,
1bded5c7-e555-4306-ac86-45da83dff439 wrote:
Thanks both Frank and Solomon for the help. I am quite new to Oracle and I feel you folks went the extra mile on the explanation
Based on your explanations, I changed the formula so the date format would be processed as YY rather than YYY.
SELECT DISTINCT pdate, EXTRACT(year from pdate) year,
to_char(to_date(pdate,'DD/MM/YY'),'DY') weekdaycalc, weekday
FROM Performance
ORDER BY pdate
And I got the correct values now:
PDATE
YEAR
WEEKDAYCALC
WEEKDAY
02-MAR-10
2010
TUE
1
03-MAR-10
2010
WED
2
04-MAR-10
2010
THU
3
05-MAR-10
2010
FRI
4
06-MAR-10
2010
SAT
5
07-MAR-10
2010
SUN
6
08-MAR-10
2010
MON
7
The interesting bit here, is the original WEEKDAY field, which clearly has been created with the same mistake I did (this whole table wasn't created by me). I reckon I spotted a design bug.
Regards,
P.
No; you're still calling TO_DATE on something that is already a DATE, and you're still using an implicit conversion (only now you're using a format such that the current NLS settings don't cause you to get punished. If your DBA changes the NLS settings next week, then you will have similar errors again.)
If you want to see what day of the week pdate is, then use:
TO_CHAR (pdate, 'DY')
or, to make it NLS-independent:
TO_CHAR (pdate, 'DY', 'NLS_DATE_LANGUAGE=ENGLISH')
This is simpler than what you posted, it's more efficient and easier to debug and to maintain, and it also gets the results you want in all cases.
One more time: TO_DATE, as the name hints, converts something (a VARCHAR2, to be precise) TO a DATE. If pdate is already a DATE, then what do you need to convert? You're implicitly converting a DATE to a VARCHAR2, then explicitly converting that VARCHAR2 back to a DATE, and then calling TO_CHAR. That's 3 function calls (1 of them error prone) where only 1 is needed.
Also if you ever have to reconcile 2-digit years with 4-digit years (and, again, in this problem you don't) the correct way is to convert the 2-digit year to a 4-digit year, not vice-versa.
Calling Tuesday the 1st day of the week could make sense in a particular application.

Wrong starting day of the week printing calendar in month view

I'm trying to print a month view calendar with the weeks starting from Monday.
In "Preferences" -> "General tab" ->"Start week on:" I've set Monday, and it is properly viewed in Calendar, but when I try to print it in the preview I see Tuesday as first day of the week.
This happens on many MacBook that I've tried, all with Yosemite and Italian regional settings.
The only way to resolve this issue is to open "System Preferences" ->"Language & Region" and change the "First day of the week:" on Sunday in all my "Preferred Languages" (both Italian and English), to have the printing preview of a calendar starting on Monday!
Is there an other way?
Is this a bug that should be submitted to Apple to get a "patch" on future releases of Mac OS X?
I know, it is a tiny issue, but annoying.
Mauro

Re: Calendar printing problem

Cannot turn on "Show the day of the week" option in Date & Time

OS X Lion turns "Show the day of the week" option off each time I open that preference pane and after every reboot. My region in Formats tab of Language & Text preference pane is set to "Russia (Russian)". I've noticed that the problem doesn't appear when region is set to US (I didn't try others). Is there any known workaround, except changing my region preference?

Me too.
And I have a workaround, until Фззду fixes it finally:
1) Go to the ~/Library/Preferences, locate a file named com.apple.menuextra.clock.plist, open it with Plist editor (comes with XCode) or just with TextEdit.
2) There's DateFormat key in it, change it to "EEE H:mm", save the file.
3) Now Cmd-I (right click - Get info) on that file in Finder, and check option named "Locked" ("Защита").
System Preferences' Date & Time pane sets the aforementioned DateFormat to "ccc H:mm" when you tick the "Show the day of the week" option, while in Russian locale. And in English it becomes "EEE H:mm". The problem is that Sys.pref and even SystemUIServer (that shows the menu) processes somehow do not like the former value and erase it. After every relaunch of SystemUIServer (after reboot or being killed) tries to change "EEE" to "ccc" again (which would be cleared to nothing next time), that is why you have to lock the plist file.

Want to make Monday as the first day of the week in GregorianCalendar. how?

hi
I need to know what day is the first of the month is. for example the 1st of Nov 2004 is Moday and 1st of Dec 2004 is saturday.
I am using the GregorianCalendar:
1. GregorianCalendar calendar = new GregorianCalendar(2004,11,1); //set date to 1st Nov 2004
2. int firstDay = calendar.get(Calendar.DAY_OF_WEEK);now firstDay is 2. This is because the week starts from Sunday, so Monday is the 2nd day.
But I am in Uk and my Uk Calendar shows monday as the first day (even in Windows 2000 Calendar).
I would like the GregorianCalendar to have Monday as the first day of the week, so that the
int firstDay = calendar.get(Calendar.DAY_OF_WEEK);
returns 1 in the above case.
I also tried adding
calendar.setFirstDayOfWeek(Calendar.MONDAY); just between line 1 and line 2, but it did not help.
This is because i don't want to manually subtract 1. If i manually subtract one, then the program might not work in other locale and timezones.
Also if I subtract 1, then for 1 Feb 2004,
int firstDay = calendar.get(Calendar.DAY_OF_WEEK);
will return 1 as 1st Feb 2004 falls on Sunday. so if i subtract 1 it will be 0, so I have to do a extra checking for 0.
Is there anyway to make the Calendar have Monday as the first day of the week??
Tanveer

hi
I need to know what day is the first of the month is.Why does this matter? Since we know that 1 == Sunday and 2 == Monday... Why do you need Monday to be == 1? and couldn't you just subtract 1 if it's so important?
for example the 1st of Nov 2004 is Moday and 1st of
Dec 2004 is saturday.
I am using the GregorianCalendar:
1. GregorianCalendar calendar = new
GregorianCalendar(2004,11,1); //set date to 1st Nov
2004
2. int firstDay = calendar.get(Calendar.DAY_OF_WEEK);now firstDay is 2. This is because the week starts
from Sunday, so Monday is the 2nd day.
But I am in Uk and my Uk Calendar shows monday as the
first day (even in Windows 2000 Calendar).
I would like the GregorianCalendar to have Monday as
the first day of the week, so that the
int firstDay = calendar.get(Calendar.DAY_OF_WEEK);
returns 1 in the above case.
I also tried adding
calendar.setFirstDayOfWeek(Calendar.MONDAY);[/cod
] just between line 1 and line 2, but it did not help.
This is because i don't want to manually subtract 1.
If i manually subtract one, then the program might not
work in other locale and timezones.
Also if I subtract 1, then for 1 Feb 2004,
int firstDay = calendar.get(Calendar.DAY_OF_WEEK);
will return 1 as 1st Feb 2004 falls on Sunday. so if i
subtract 1 it will be 0, so I have to do a extra
checking for 0.
Is there anyway to make the Calendar have Monday as
the first day of the week??
Tanveer

Date field input help - changing first day of the week

Hi,
I need to change the starting day of the week in a date field value help. I also need to change the days name in this calender.
Thanks in Advance,
Dekel.

I found how to change the first day of the week, through BAdi calendar_definition.
Can anyone help me locate the day names? (I checked - FM day_names_get dosen't get the names of the UI search help).
Thanks,
Dekel.
Edited by: dekel31 on May 29, 2011 1:17 PM

After iOS 5 upgrade, my calendar starts on the wrong day of the week

I've upgraded my iPhone to iOS 5. My region is still selected as Australia, but Sunday is showing up as the first day of the week now.
I have not yet upgraded my iPad. It shows Australia as the region format and is correctly displaying Monday as the first day of the week.
So it appears that the iOS 5 update changes some details of the Australia region format. Does anyone know of a way to manually select the first day of the week? Thanks.

I can confirm that the start day of the week is determined by the Region Format setting (insanely). My girlfriend is still on iOS 4.3.5 and has a Region Format of Australia, and has the week starting on Monday. Apple must have changed it to Sunday in iOS 5.
The best workaround country I've found so far is Namibia!
Tap on Settings > General > International. change Region Format to Namibia.
Different regions affect different things. If you choose UK, you get the week starting on Monday, but the clock changes to 24 hr and the phone numbers format the UK way.
The only downside of Namibia so far is that you no longer get ".au" as an option if you're typing a web address and you hold down the ".com" button on the keyboard.
Apple needs to add a "First Day of Week" option in the Calender preferences, like they have in the iCloud Calendar preferences and iCal preferences (which are both ignored on the iPhone and iPad!).
Even Americans are complaining about this. It must be the easiest fix in the world, yet they still haven't done it.

Getting Day of the Week

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