juanpabloprado

jshell> import java.util.ArrayList;

jshell> import java.time.format.DateTimeFormatter;                                                                ^

jshell> ArrayList<DateTimeFormatter> ldtFormattersList = new ArrayList<>();
ldtFormattersList ==> []

jshell> ldtFormattersList.add(DateTimeFormatter.BASIC_ISO_DATE);
$57 ==> true

juanpabloprado

jshell> import static java.time.format.DateTimeFormatter.*;

jshell> ld.format(ISO_WEEK_DATE);
$43 ==> "2019-W17-6"

jshell> import java.time.OffsetDateTime;

jshell> OffsetDateTime odt = OffsetDateTime.now();
odt ==> 2019-04-27T16:22:54.724099-05:00

juanpabloprado

jshell> Period p1 = Period.parse("P0Y13M");
p1 ==> P13M

jshell> "Original: " + p1 + " Normalized: " + p1.normalized();
$36 ==> "Original: P13M Normalized: P1Y1M"

jshell> Period p2 = Period.parse("P2Y-1M");
p2 ==> P2Y-1M

jshell> "Original: " + p2 + " Normalized: " + p2.normalized();

juanpabloprado

shell> String WAR_OF_1812_START_DATE = "1812-06-18";
WAR_OF_1812_START_DATE ==> "1812-06-18"

jshell> String WAR_OF_1812_END_DATE = "1815-02-18";
WAR_OF_1812_END_DATE ==> "1815-02-18"

jshell> import java.time.LocalDate;

jshell> LocalDate warBegins = LocalDate.parse(WAR_OF_1812_START_DATE);
warBegins ==> 1812-06-18

juanpabloprado

jshell> Period p1 = Period.parse("P10D").minusDays(10);
p1 ==> P0D

jshell> "Is zero: " + p1.isZero();
$24 ==> "Is zero: true"

jshell> // Period equals negative value

jshell> Period p2 = Period.parse("P2019M");
p2 ==> P2019M

juanpabloprado

jshell> Period period = Period.of(5, 2, 1);
period ==> P5Y2M1D

jshell> period = period.plusYears(10);
period ==> P15Y2M1D

jshell> period = period.plusMonths(10);
period ==> P15Y12M1D

jshell> period = period.plusDays(15);

juanpabloprado

jshell> Period P1 = Period.ofYears(1); // 1 year
P1 ==> P1Y

jshell> Period P2 = Period.ofMonths(12) // 1 year
P2 ==> P12M

jshell> Period P3 = Period.ofWeeks(52) // 1 year
P3 ==> P364D

jshell> Period P4 = Period.ofDays(366) // 1 year (leap)

juanpabloprado

jshell> LocalDate ld = LocalDate.now();
ld ==> 2019-04-23

jshell> // All plus methods

jshell> ld = ld.plusYears(1).plusMonths(12).plusWeeks(52).plusDays(365);
ld ==> 2023-04-22

jshell> // All minus methods

juanpabloprado

jshell> import java.util.Calendar;

jshell> import java.time.Instant;

jshell> Calendar calendar = Calendar.getInstance();
calendar ==> java.util.GregorianCalendar[time=1556074159985,ar ... 600000,DST_OFFSET=3600000]

jshell> Instant instant = calendar.toInstant();
instant ==> 2019-04-24T02:49:19.985Z

juanpabloprado

jshell> LocalDateTime ldt1 = LocalDateTime.now();
ldt1 ==> 2019-04-23T21:41:59.084165

jshell> LocalDateTime ldt2 = LocalDateTime.parse("2019-01-01T12:00:00");
ldt2 ==> 2019-01-01T12:00

jshell> LocalDateTime ldt3 = LocalDateTime.of(2019, 1, 1, 12, 0);
ldt3 ==> 2019-01-01T12:00

jshell> LocalDateTime ldt4 = LocalDateTime.of(2019, Month.JANUARY, 1, 12, 0);