![]() But I can't throw the sales of this week because it is relevant and true data. The 53th of December 2015, which is December 28th until January 3th is grouped with week 1, skewing my data graph. It was then that I noticed December of 2015 had a week 53. When I went back to the limit of December 28th until January 10th, all data was classified as week 1. It was then that I noticed that week 52 of 2015 only appeared as soon as I included December 27th. When I took a few more dates before and after this week, I noticed that week 1 was growing the more days I added before week 1 as stated by the calendars (January 4th until January 10th). So then there must've been some other error. Surprisingly, when I explored this week ordered by day, no outlier or total amount was equal to that given the graph. I immediately classified this graph point as an outlier so I started investigating this particular week by narrowing the graph down to this week. The total amount was a little more than double of the second highest week and thus a huge peak compared to the others in the graph. When I plotted the totals by week, there was one week that sorely stood out of all the other weeks in 4 years of time, which was week 1 of 2016. Also set your GMT value according to your need.I was plotting some data of a webhop sales order dataset. Here you can view the reference by oracleĪnd I have placed a quick solution to find the week count of current day. For earlier Android, the ThreeTenABP project adapts ThreeTen-Backport (mentioned above).Later versions of Android bundle implementations of the java.time classes.Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.Java 9 adds some minor features and fixes.Part of the standard Java API with a bundled implementation.And search Stack Overflow for many examples and explanations. The Joda-Time project, now in maintenance mode, advises migration to the java.time classes. These classes supplant the troublesome old legacy date-time classes such as, Calendar, & SimpleDateFormat. The java.time framework is built into Java 8 and later. ( ld + " is ISO 8601 week: " + isoOutput ) īy the way, if Android is ever able to run the ThreeTen-Extra library, you’ll find its YearWeek class useful. String isoOutput = yearOfWeekBasedYear + "-W" + String.format("%02d", weekOfWeekBasedYear) + "-" + dayOfWeekNumber Int yearOfWeekBasedYear = ld.get( IsoFields.WEEK_BASED_YEAR ) ĭump to console using standard ISO 8601 format of YYYY-Www-D. You can ask for either of these TemporalField objects: IsoFields.WEEK_BASED_YEAR & IsoFields.WEEK_OF_WEEK_BASED_YEAR int weekOfWeekBasedYear = ld.get( IsoFields.WEEK_OF_WEEK_BASED_YEAR ) Interrogate for the standard week number. LocalDate ld = LocalDate.of( 2012, Month.AUGUST, 7 ) The LocalDate class represents a date-only value without time-of-day and without time zone. The first and last few days of the calendar year may land in the prior/following week-based year. ![]() There are different ways to define a week and week number.īy default, the java.time classes use the standard ISO 8601 definition: Week # 1 has the first Thursday of the calendar year, and starts on Monday (as you asked for). You must define what you mean by week number. For earlier Android, see the last bullets below. java.timeĬalendar is part of the troublesome old date-time classes that are now legacy, supplanted by the java.time classes. You should be using the java.time classes that replaced Calendar class. In Calendar the definition of a week varies by the locale.īut this is moot. Not sure of the direct answer to your Question, but likely to be differing Locale values in play. get( IsoFields.WEEK_OF_WEEK_BASED_YEAR ) ![]() Tl dr LocalDate.of( 2018, Month.DECEMBER, 31 ) For example, a specific Calendar subclass mayĭesignate the week before week 1 of a year as week n of the previous Note that the normalized numbering returned by , -1, 0 precede the first week weeks numberedĢ, 3. The first week of a month or year is defined as theĮarliest seven day period beginning on getFirstDayOfWeek() andĬontaining at least getMinimalDaysInFirstWeek() days of that month or When setting or getting the WEEK_OF_MONTH or WEEK_OF_YEAR fields, Calendar must determine the first week of the month or year as a They may also be specifiedĮxplicitly through the methods for setting their values. These numbers are taken from the locale resourceĭata when a Calendar is constructed. Parameters: the first day of the week and the minimal days in first Calendar defines a locale-specific seven day week using two
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