Get first date of current month in java

Question

I am trying to get to and from date where ToDate will have previous date and FromDate will have first date of the current month  For January it would be 1 1 2013 and so on  How to get the first date of the current month correctly  I am not able to do it   today add Calendar DAY OF MONTH  -1   java util Date previousDay today getTime    ToDate   sdfFile1 format newjava sql Date previousDay getTime      today add Calendar DATE  1   java util Date nextDay today getTime    FromDate   sdfFile1 format new java sql Date nextDay getTime

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First day of month of a date  public static Date firstDayOfMonth Date d             Calendar calendar   new GregorianCalendar        calendar setTime d       calendar set Calendar DAY OF MONTH  1            return calendar getTime

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If you also want the time is set to 0 the code is    import java util    import java text     public class DateCalculations     public static void main String   args         Calendar aCalendar   Calendar getInstance         aCalendar set Calendar DATE  1       aCalendar set Calendar HOUR OF DAY  0       aCalendar set Calendar MINUTE  0       aCalendar set Calendar SECOND  0        Date firstDateOfCurrentMonth   aCalendar getTime         SimpleDateFormat sdf   new SimpleDateFormat  yyyy-MM-dd HH mm ss zZ        sdf setTimeZone TimeZone getTimeZone  UTC          String dayFirst   sdf format firstDateOfCurrentMonth       System out println dayFirst           You can check online easily without compiling by using   http   www browxy com

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In Java 8 you can use  LocalDate date   LocalDate now      2020-01-12 date withDayOfMonth 1     2020-01-01

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tl dr     How to get the first date of the current month correctly    LocalDate now             with  TemporalAdjusters firstDayOfMonth       Or     YearMonth now   atDay  1     Or     LocalDate now   with   ChronoField DAY OF MONTH   1     java time  The java time framework in Java 8 and later supplants the old java util Date  Calendar classes  The old classes have proven to be troublesome  confusing  and flawed  Avoid them   The java time framework is inspired by the highly-successful Joda-Time library  defined by JSR  310  extended by the ThreeTen-Extra project  and explained in the Tutorial   LocalDate  For a date-only value  without time-of-day  use the LocalDate class  While LocalDate has no assigned time zone  we must specify a time zone in order to determine a date such as    today     For example  a new day dawns earlier in Paris than in Montr  al    Time zone is crucial in determining today s date  For any given moment  the date varies around the world by zone  Omitting the time zone means the JVM   s current time zone is automatically applied in determining the current date  Any code in the JVM can change the default at runtime  so you are walking on shifting sands  Better to specify your desired expected time zone explicitly than rely implicitly on the current default   Specify a proper time zone name in the format of continent region  such as America Montreal  Africa Casablanca  or Pacific Auckland  Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones  not standardized  and not even unique       ZoneId zoneId   ZoneId of    America Montreal     LocalDate today   LocalDate now   zoneId    LocalDate firstOfCurrentMonth   today with   ChronoField DAY OF MONTH   1      Dump to console   System out println    For zoneId      zoneId     today is      today     and first of this month is     firstOfCurrentMonth         For zoneId  America Montreal today is  2015-11-08 and first of this month is 2015-11-01   Alternatively  use a TemporalAdjuster  For your purpose  you will find handy implementations in the TemporalAdjusters class  note plural s   specifically firstDayOfMonth   LocalDate firstOfCurrentMonth   today with  TemporalAdjusters firstDayOfMonth         ZonedDateTime  If you need a time of day  remember that 00 00 00 000 is not always the first moment of the day because of Daylight Saving Time  DST  and perhaps other anomalies  So let java time determine the correct time of the first moment of the day   ZonedDateTime zdt   firstOfCurrentMonth atStartOfDay   zoneId         2015-11-01T00 00-04 00 America Montreal      About java time  The java time framework is built into Java 8 and later  These classes supplant the troublesome old legacy date-time classes such as java util Date  Calendar   amp  SimpleDateFormat   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   Where to obtain the java time classes     Java SE 8  Java SE 9  and later   Built-in   Part of the standard Java API with a bundled implementation  Java 9 adds some minor features and fixes   Java SE 6 and Java SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   Later versions of Android bundle implementations of the java time classes  For earlier Android  the ThreeTenABP project adapts ThreeTen-Backport  mentioned above   See How to use ThreeTenABP        The ThreeTen-Extra project extends java time with additional classes  This project is a proving ground for possible future additions to java time  You may find some useful classes here such as Interval  YearWeek  YearQuarter  and more

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try       Calendar c   Calendar getInstance         this takes current date     c set Calendar DAY OF MONTH  1       System out println c getTime              this returns java util Date   Updated  Since Java 8    import java time LocalDate  LocalDate todaydate   LocalDate now    System out println  Months first date in yyyy-mm-dd     todaydate withDayOfMonth 1

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import java util Date  import java text SimpleDateFormat       Date currentMonth   new Date    String yyyyMM   new SimpleDateFormat  quot yyyyMM quot   format currentMonth   Date firstDateOfMonth   new SimpleDateFormat  quot yyyyMM quot   parse yyyyMM        my stupid solution  but it s work for me  D

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You can use withDayOfMonth int dayOfMonth  method from java8 to return first day of month   LocalDate firstDay   LocalDate now   withDayOfMonth 1   System out println firstDay        2019-09-01

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Calendar date   Calendar getInstance    date set Calendar DAY OF MONTH  1

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Joda Time  If I am understanding the question correctly  it can be done very easily by using joda time  LocalDate fromDate   new LocalDate   withDayOfMonth 1   LocalDate toDate   new LocalDate   minusDays 1

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In order to get a Date  that can be used in JPA later on   I did Date startOfMonth   Date from LocalDate now   withDayOfMonth 1  atStartOfDay   toInstant ZoneOffset UTC      I take current date LocalDate now   Move it to first day of the month withDayOfMonth 1  Move it to the sart of the day atStartOfDay   to get rid of hours and minutes and deal with the TimeZone issues by changing it into an Instant with the  quot right quot  ZoneOffset

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Works Like a charm   public static String  getCurrentMonthFirstDate        Calendar c   Calendar getInstance           c set Calendar DAY OF MONTH  1       DateFormat df   new SimpleDateFormat  MM-dd-yyyy          System out println df format c getTime           return df format c getTime           Correction  output  02-01-2018

[java] Get first date of current month in java

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