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  1. import java.time.LocalDate;
  2. import java.time.LocalTime;
  3. import java.time.ZoneId;
  4. import java.time.ZonedDateTime;
  5. import java.time.format.DateTimeFormatter;
  6. import java.time.temporal.ChronoField;
  7. import java.time.temporal.TemporalAdjusters;
  8. import java.util.Locale;
  9.  
  10. class Main {
  11.     public static void main(String[] args) {
  12.         // Replace ZoneId.systemDefault() with the applicable ZoneId e.g.
  13.         // ZoneId.of("America/New_York")
  14.         ZonedDateTime zdt = ZonedDateTime.now(ZoneId.systemDefault());
  15.         System.out.println(zdt);
  16.  
  17.         zdt = zdt.with(TemporalAdjusters.firstDayOfMonth());
  18.         System.out.println(zdt);
  19.  
  20.         zdt = zdt.withHour(LocalTime.MIN.getHour());
  21.         System.out.println(zdt);
  22.  
  23.         zdt = zdt.withMinute(LocalTime.MIN.getMinute());
  24.         System.out.println(zdt);
  25.  
  26.         zdt = zdt.withSecond(LocalTime.MIN.getSecond());
  27.         System.out.println(zdt);
  28.  
  29.         zdt = zdt.with(ChronoField.MILLI_OF_SECOND, LocalTime.MIN.getLong(ChronoField.MILLI_OF_SECOND));
  30.         DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH);
  31.         System.out.println(zdt.format(formatter));
  32.  
  33.         // In a single statement
  34.         String output = ZonedDateTime.now(ZoneId.systemDefault())
  35.                 .with(TemporalAdjusters.firstDayOfMonth())
  36.                 .withHour(LocalTime.MIN.getHour())
  37.                 .withMinute(LocalTime.MIN.getMinute())
  38.                 .withSecond(LocalTime.MIN.getSecond())
  39.                 .with(ChronoField.MILLI_OF_SECOND, LocalTime.MIN.getLong(ChronoField.MILLI_OF_SECOND))
  40.                 .format(formatter);
  41.         System.out.println(output);
  42.  
  43.         // There is a better way if all you want is day-1 with minimum time
  44.         zdt = LocalDate.now(ZoneId.systemDefault())
  45.                 .with(TemporalAdjusters.firstDayOfMonth())
  46.                 .atStartOfDay()
  47.                 .atZone(ZoneId.systemDefault());
  48.         System.out.println(zdt.format(formatter));
  49.     }
  50. }
Success #stdin #stdout 0.13s 49468KB
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Standard input is empty
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2023-01-19T16:50:43.811714Z[GMT]
2023-01-01T16:50:43.811714Z[GMT]
2023-01-01T00:50:43.811714Z[GMT]
2023-01-01T00:00:43.811714Z[GMT]
2023-01-01T00:00:00.811714Z[GMT]
2023-01-01T00:00:00.000Z
2023-01-01T00:00:00.000Z
2023-01-01T00:00:00.000Z
https://ideone.com/nIPvu7
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
secret

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