dayofweek

问题 Rails 2.3.4 I have searched google, and have not found an answer to my dilemma. For this discussion, I have two models. Users and Entries. Users can have many Entries (one for each day). Entries have values and sent_at dates. I want to query and display the average value of entries for a user BY DAY OF WEEK. So if a user has entered values for, say, the past 3 weeks, I want to show the average value for Sundays, Mondays, etc. In MySQL, it is simple: SELECT DAYOFWEEK(sent_at) as day, AVG(value

问题 I have a requirement to check records up to differing dates, depending on which day of the week it is currently. On a Friday I need for it to look at the entire next week, until Sunday after next. On any other day it should check the current week, up until the coming Sunday. I have the below currently but it's not working due to syntax error. Is it possible to do a CASE WHEN inside a WHERE clause? WHERE T0.[Status] IN ('R','P') AND CASE WHEN DATEPART(weekday,GETDATE()) = '5' THEN T0.[DueDate]

问题 I have converted several days of the week to their respective integer values.. For example: Tuesday, Thursday, Friday As 2,4,5 Now I need to get back to the days from the integers. Simply the inverse of what i had done. Inverse of the Question: Get Integer value of day of week Is there a simple standard way for getting day of week from integer value in C# or else I will have to perform a manual calculation with a Method? 回答1: try below code :- Response.Write(Enum.GetName(typeof(DayOfWeek),5))

问题 i am trying to create a set of day-of-week boxplots for a timeseries (e.g. 5-minute temperature observations). My code: # ts is our timeseries ts = df.SomeColumn dow_map = {} days = ['MON','TUE','WED','THU','FRI','SAT','SUN'] dow_idx = ts.index.dayofweek i = 0 for d in days: dow_map[d] = ts[dow_idx == i] i = i + 1 df = pd.DataFrame(dow_map) df.boxplot() results in: --------------------------------------------------------------------------- Exception Traceback (most recent call last) <ipython

问题 Is there a way to set the first DayOfWeek as Monday = 0 not Sunday? (int)dateList[0].DayOfWeek == 0) // 0 = Sunday 回答1: You would need to create a custom culture, and specify the initial DayOfWeek as Monday. An instance of your custom culture would need to be set to whatever context is normally used to access culture information (i.e. Thread.CurrentCulture ). The following article should get you started on creating a custom culture: How to: Create Custom Cultures EDIT: I just reread your

问题 How can I order the mysql result by varchar column that contains day of week name? Note that MONDAY should goes first, not SUNDAY. 回答1: Either redesign the column as suggested by Williham Totland, or do some string parsing to get a date representation. If the column only contains the day of week, then you could do this: ORDER BY FIELD(<fieldname>, 'MONDAY', 'TUESDAY', 'WEDNESDAY', 'THURSDAY', 'FRIDAY', 'SATURDAY', 'SUNDAY'); 回答2: Why not this? ORDER BY ( CASE DAYOFWEEK(dateField) WHEN 1 THEN

问题 I want to create a function in C# which for a week number will return me the days, in that week. For instance for week number 40, how can I get the days: 4/10, 5/10, 6/10, 7/10, 8/10, 9/10, 10/10. Thank you in advance! 回答1: I think this should do what you want: public static DateTime[] WeekDays(int Year, int WeekNumber) { DateTime start = new DateTime(Year, 1, 1).AddDays(7 * WeekNumber); start = start.AddDays(-((int)start.DayOfWeek)); return Enumerable.Range(0, 7).Select(num => start.AddDays

问题 I am running SQL Server 2008 on a machine with regional settings that have Monday as the first day of the week. If I create a computed column in a table to compute the day of week for a date field then I get 2 for a Monday date instead of 1. Is there some property for the table or database or server that I need to set ? 回答1: The first day of the week is based on your language settings of the server. The default setting for us_english is 7 (Sunday) You can find the current first day of the

问题 We have a utility that will run any day between Monday - Friday. It will update some number of files inside a Content Management Tool. The last modified date associated with that file should be, that week's monday's date. I wrote the following program to retrieve current week's monday's date. But I am still not sure whether this would work for all scenarios. Has anyone got a better solution ? Calendar c = Calendar.getInstance(); c.setTime(new Date()); System.out.println(c.get(Calendar.DAY_OF

问题 My problem can be easily created by the scenario below: //create a gregorian calendar object that set the date and time as 4th June 2012 at 10:30PM Calendar calendar = new GregorianCalendar(2012, 6, 4, 22, 30); //when I print out these: System.out.println(calendar.get(Calendar.DAY_OF_WEEK)); System.out.println(calendar.get(Calendar.MINUTE)); System.out.println(calendar.get(Calendar.HOUR)); System.out.println(calendar.get(Calendar.DATE)); System.out.println(calendar.get(Calendar.MONTH));