date

问题 I have in my table a timestamps with created_at and updated_at $table->timestamps(); But I want to add another column that calculates the difference between created_at and updated_at in days Should I do that in SQL or in my controller? 回答1: You can do that from within your Eloquent model. Let's assume your model has the name User . You can create a computed field by defining an Accessor. class User extends Model { $dates = [ 'updated_at', 'created_at' ]; $appends = ['diffInDays']; public

问题 I would like to convert my date column into an indicator of the quarter of that particular year, say 2018q1 or 2018q2 etc. My data looks like this, I have stock returns once per quarter (not showing the return column here), and a corresponding date, the column quarter is what I would like to get (or something similar) data = [{'date': '3/22/18', 'quarter': 1},{'date': '3/22/18', 'quarter': 1}, {'date': '6/22/18', 'quarter': 3},{'date': '6/22/18', 'quarter': 3}, {'date': '9/22/18', 'quarter':

问题 I would like to convert my date column into an indicator of the quarter of that particular year, say 2018q1 or 2018q2 etc. My data looks like this, I have stock returns once per quarter (not showing the return column here), and a corresponding date, the column quarter is what I would like to get (or something similar) data = [{'date': '3/22/18', 'quarter': 1},{'date': '3/22/18', 'quarter': 1}, {'date': '6/22/18', 'quarter': 3},{'date': '6/22/18', 'quarter': 3}, {'date': '9/22/18', 'quarter':

问题 I have this class class MyObject { private LocalDateTime date; public LocalDateTime getDate() { return this.date; } public void myMethod() { this.date = LocalDateTime.now(); } } How can I test that the date is properly set? I cannot mock now() because it is static and if I used LocalDateTime in the test both dates won't be the same. 回答1: You could generate a date time just before calling myMethod() and make sure that this date is before or equals to the date returned by getDate() , something

问题 I have a data.table with ID, dates and values like the following one: DT <- setDT(data.frame(ContractID= c(1,1,1,2,2), Date = c("2018-02-01", "2018-02-20", "2018-03-12", "2018-02-01", "2018-02-12"), Value = c(10,20,30,10,20))) ContractID Date Value 1: 1 2018-02-01 10 2: 1 2018-02-20 20 3: 1 2018-03-12 30 4: 2 2018-02-01 10 5: 2 2018-02-12 20 I'd like to get a new column with the total cumulative sum per ID from a month ago until the current day for each row, like in the table below. NB: the

问题 I have a data.table with ID, dates and values like the following one: DT <- setDT(data.frame(ContractID= c(1,1,1,2,2), Date = c("2018-02-01", "2018-02-20", "2018-03-12", "2018-02-01", "2018-02-12"), Value = c(10,20,30,10,20))) ContractID Date Value 1: 1 2018-02-01 10 2: 1 2018-02-20 20 3: 1 2018-03-12 30 4: 2 2018-02-01 10 5: 2 2018-02-12 20 I'd like to get a new column with the total cumulative sum per ID from a month ago until the current day for each row, like in the table below. NB: the

问题 I have a data.table with ID, dates and values like the following one: DT <- setDT(data.frame(ContractID= c(1,1,1,2,2), Date = c("2018-02-01", "2018-02-20", "2018-03-12", "2018-02-01", "2018-02-12"), Value = c(10,20,30,10,20))) ContractID Date Value 1: 1 2018-02-01 10 2: 1 2018-02-20 20 3: 1 2018-03-12 30 4: 2 2018-02-01 10 5: 2 2018-02-12 20 I'd like to get a new column with the total cumulative sum per ID from a month ago until the current day for each row, like in the table below. NB: the

问题 Im checking if the current date is a weekday, if not I want to get the next weekday. Weekday is from Monday to Friday. Here is what I have tried: import time from datetime import date,timedelta dmy=time.strftime("%d-%m-%Y")# getting the current date if dmy.strftime("%w") in set([6,7]): # checking if its a weekend( Sat/Sun) , if so advancing dmy=time.strftime("%d-%m-%Y")+ timedelta(days=dmy.strftime("%w")%5) # this statement is not working, it errors out . The statement dmy=time.strftime("%d-

问题 I want to set date in date format in excel file with Apache POI. The value will set in such a manner so that in Address Bar it will show in mm/dd/YYYY and in cell it will show in dd-mmm (Date in numeric and Month in String like 01-Jan). Will you please help me in this situation? 回答1: You can apply a HSSFCellStyle to the cell you need to fill. Here some code snippets from my past work, it's not intact but shows the basic idea: HSSFRow row = sheet.createRow(0); HSSFCell cell = row.createCell(

问题 I want to set date in date format in excel file with Apache POI. The value will set in such a manner so that in Address Bar it will show in mm/dd/YYYY and in cell it will show in dd-mmm (Date in numeric and Month in String like 01-Jan). Will you please help me in this situation? 回答1: You can apply a HSSFCellStyle to the cell you need to fill. Here some code snippets from my past work, it's not intact but shows the basic idea: HSSFRow row = sheet.createRow(0); HSSFCell cell = row.createCell(