date-conversion

问题 This question already has answers here : changing date format from dd/MM/yyyy to MM/dd/yyyy [duplicate] (4 answers) Closed 3 years ago . I need to convert "28/08/2012" to MM/dd/YYYY format that means "08/28/2012". How can I do that? I am using below code , but it threw exception to me. DateTime.ParseExact("28/08/2012", "ddMMyyyy", CultureInfo.InvariantCulture) 回答1: but it threw exception to me Problem: Your date contains / seperator ( "28/08/2012" ) and you are not giving that in your date

问题 This is probably a very basic question but after reading documentation I still can't figure out how to do it... I have two strings in Python that contain dates of unknown format . I don't know what formats they are in, except I know that both are valid date-time expressions. For example, one of them might be in the ISO format and the other in some other format. All I need is to be able to compare the dates. What's the correct way to turn strings into appropriate date-time objects so that they

问题 how can I convert a vector of date string like c("October 1, 2014", "June 14, 2014") to a vector of R Date format? I have a data.frame which one column is date string in the above format. I would appreciate your help. Thanks! 回答1: Try: v <- c("October 1, 2014", "June 14, 2014") as.Date(v, "%B %d,%Y") Which gives: #[1] "2014-10-01" "2014-06-14" Or strptime(v, "%B %d,%Y") Which gives: #[1] "2014-10-01 EDT" "2014-06-14 EDT" Benchmark largev <- rep(v, 10e5) library(microbenchmark) microbenchmark(

问题 I am not sure why strtotime() in PHP returns different result in different timezone even though same date is given as parameter, does anyone know the answer? I also want to know, can I do similar task (converting a datetime to an int to do calculations easily) with another function which gives same result across different timezone? EDIT: An example: If I use strtotime('2011-09-19 00:00:00') shouldn't it just return the difference between 'January 1 1970 00:00:00' and '2011-09-19 00:00:00' in

问题 I want to convert from Gregorian to Hijri(Islamic) date and I need a java class for this converting. I want to give it an Gregorian date in format of "yyyy/mm/dd" as string and it give me the Hijri date in the same format. can anyone help me? 回答1: Firstly, separate out the conversion part from the formatting/parsing part. You can deal with those easily later - and there are lots of questions on Stack Overflow about that. Personally I'd use Joda Time, which typically makes life much simpler.

问题 I have some very simple data in R that needs to have its date format changed: date midpoint 1 31/08/2011 0.8378 2 31/07/2011 0.8457 3 30/06/2011 0.8147 4 31/05/2011 0.7970 5 30/04/2011 0.7877 6 31/03/2011 0.7411 7 28/02/2011 0.7624 8 31/01/2011 0.7665 9 31/12/2010 0.7500 10 30/11/2010 0.7734 11 31/10/2010 0.7511 12 30/09/2010 0.7263 13 31/08/2010 0.7158 14 31/07/2010 0.7110 15 30/06/2010 0.6921 16 31/05/2010 0.7005 17 30/04/2010 0.7113 18 31/03/2010 0.7027 19 28/02/2010 0.6973 20 31/01/2010 0

问题 Here's what I use: SELECT CAST(FLOOR(CAST(getdate() as FLOAT)) as DATETIME) I'm thinking there may be a better and more elegant way. Requirements: It has to be as fast as possible (the less casting, the better). The final result has to be a datetime type, not a string. 回答1: SQL Server 2008 and up In SQL Server 2008 and up, of course the fastest way is Convert(date, @date) . This can be cast back to a datetime or datetime2 if necessary. What Is Really Best In SQL Server 2005 and Older? I've

问题 I have been developing application with GWT on Java. I used calendar tool for my project on this site. When i select any date, give this format (23-Aug-13) to me. I use this code: final DateField txtBirthofDay = new DateField("Birth of Day", "dob", 190); txtBirthofDay.setValue(new Date()); I want to insert this date to database. So, I have to convert this format (2013-08-23). I converted lots of date format each other before but I didn't convert string type (Aug). 回答1: SimpleDateFormat

问题 This question already has answers here : How can I change the date format in Java? [duplicate] (10 answers) Closed 5 years ago . I have a string and i need to convert it to date in the "YYYY-mm-dd" format which i'm unable to do. I checked the similar post on stckoverflow but didnt help so i'm posting this query. String stringDate = "Dec 13, 2013"; I need this to be convert to Date reportDate = 2013-12-13"; when i use simpledateformat i got unparsable date. Please help 回答1: Check this out: try

问题 I have a room database . I have a column for date and it's saved as string . I used this query for sort my column : @Query("SELECT * FROM session WHERE class_id = :classId ORDER BY session_date ASC") List<SessionEntry> getAllSessions(int classId); Result : 1398/11/25 1398/11/29 1398/12/5 1398/2/14 1398/4/25 1398/6/17 1398/6/30 1398/7/9 1398/9/14 but i want to sort like this : 1398/2/14 1398/4/25 1398/6/17 1398/6/30 1398/7/9 1398/9/14 1398/11/25 1398/11/29 1398/12/5 Is there any way I could