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[英]Java Calendar define day and time range in the week to compare against
[英]JAVA Calendar range with time and day of week
我正在嘗試檢查給定日期是否在周日晚上 10 點到周五晚上 10 點之間的范圍內
我想使用 Calendar 來實現這一點,我寫了一小段邏輯上不正確的代碼。 我會很感激這里的一些幫助
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(lastTickTime);
calendar.setTimeZone(TimeZone.getTimeZone("GMT"));
int currentHour = calendar.get(Calendar.HOUR_OF_DAY);
int currentDay = calendar.get(Calendar.DAY_OF_WEEK);
int fromDay = 1;
int toDay = 6;
int fromHour = 22;
int toHour = 22;
boolean result = (currentDay <= fromDay && currentHour < fromHour) || (currentDay >= toDay && currentHour > toHour);
我知道上面的方法是不對的,我不確定如何 go 關於它。 謝謝
我剛剛看到您在評論中提到了以下內容:
如果在周五晚上 10 點到周日晚上 10 點之間返回真
這與您在問題中提到的(下面給出的)完全不同:
我正在嘗試檢查給定日期是否在周日晚上 10 點到周五晚上 10 點之間的范圍內
我已經為您提供了檢查周日晚上 10 點到周五晚上 10 點之間的日期時間的解決方案(查看原始解決方案部分)。
下面給出的是一周中周五晚上 10 點到周日晚上 10 點之間的日期時間的解決方案:
import java.time.DayOfWeek;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoField;
public class Main {
public static void main(String[] args) {
// Test
System.out.println(isValidTime("2020-12-25T09:38:08", "America/Chicago"));// Should be false
System.out.println(isValidTime("2020-12-25T22:38:08", "America/Chicago"));// Should be true
System.out.println(isValidTime("2020-12-26T09:38:08", "America/Chicago"));// Should be true
System.out.println(isValidTime("2020-12-27T09:38:08", "America/Chicago"));// Should be true
System.out.println(isValidTime("2020-12-27T22:38:08", "America/Chicago"));// Should be false
}
static boolean isValidTime(String strDateTime, String timezone) {
ZoneId zoneId = ZoneId.of(timezone);
ZonedDateTime zdt = LocalDateTime.parse(strDateTime).atZone(zoneId).withZoneSameInstant(ZoneOffset.UTC);
ZonedDateTime fri10Pm = zdt.with(ChronoField.DAY_OF_WEEK, DayOfWeek.FRIDAY.getValue())
.with(LocalTime.of(22, 0));
ZonedDateTime sun10Pm = zdt.with(ChronoField.DAY_OF_WEEK, DayOfWeek.SUNDAY.getValue())
.with(LocalTime.of(22, 0));
return zdt.isAfter(fri10Pm) && zdt.isBefore(sun10Pm);
}
}
Output:
false
true
true
true
false
java.util
及其格式 API, SimpleDateFormat
已過時且容易出錯。 建議完全停止使用它們並切換到現代日期時間 API 。
使用java.time
(現代日期時間 API):
import java.time.DayOfWeek;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoField;
public class Main {
public static void main(String[] args) {
// Test
System.out.println(isValidTime("2020-12-25T09:38:08", "America/Chicago"));// Should be true
System.out.println(isValidTime("2020-12-26T09:38:08", "America/Chicago"));// Should be false
System.out.println(isValidTime("2020-12-27T09:38:08", "America/Chicago"));// Should be false
System.out.println(isValidTime("2020-12-27T22:38:08", "America/Chicago"));// Should be true
System.out.println(isValidTime("2021-01-01T09:38:08", "America/Chicago"));// Should be true
System.out.println(isValidTime("2021-01-01T23:38:08", "America/Chicago"));// Should be false
}
static boolean isValidTime(String strDateTime, String timezone) {
ZoneId zoneId = ZoneId.of(timezone);
ZonedDateTime zdt = LocalDateTime.parse(strDateTime).atZone(zoneId).withZoneSameInstant(ZoneOffset.UTC);
ZonedDateTime temp = zdt.getDayOfWeek() != DayOfWeek.SUNDAY ? zdt.minusWeeks(1) : zdt;
ZonedDateTime sun10Pm = temp.with(ChronoField.DAY_OF_WEEK, DayOfWeek.SUNDAY.getValue())
.with(LocalTime.of(22, 0));
ZonedDateTime fri10PmNextWeek = temp.plusWeeks(1).with(ChronoField.DAY_OF_WEEK, DayOfWeek.FRIDAY.getValue())
.with(LocalTime.of(22, 0));
return zdt.isAfter(sun10Pm) && zdt.isBefore(fri10PmNextWeek);
}
}
Output:
true
false
false
true
true
false
該解決方案基於以下假設,您應該在偏離任何這些假設的情況下對其進行調整:
UTC
中的日期時間。 該解決方案將日期時間字符串解析為本地日期時間(沒有任何時區信息的日期時間),然后將其轉換為日期時間所屬時區的ZonedDateTime
。 最后,此ZonedDateTime
被轉換為UTC
中的日期時間。Sun
,則比較應該在從最后一個Sun
到即將到來的Fri
的日期進行。10 pm
的時間不包括在內。附錄:
如果您不必處理時區,而只想檢查給定的日期時間是否在周五晚上 10 點到周日晚上 10 點之間,則可以使用LocalDateTime
來完成。
import java.time.DayOfWeek;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.temporal.ChronoField;
public class Main {
public static void main(String[] args) {
// Test
System.out.println(isValidTime("2020-12-25T09:38:08"));// Should be false
System.out.println(isValidTime("2020-12-25T22:38:08"));// Should be true
System.out.println(isValidTime("2020-12-26T09:38:08"));// Should be true
System.out.println(isValidTime("2020-12-27T09:38:08"));// Should be true
System.out.println(isValidTime("2020-12-27T22:38:08"));// Should be false
}
static boolean isValidTime(String strDateTime) {
LocalDateTime ldt = LocalDateTime.parse(strDateTime);
LocalDateTime fri10Pm = ldt.with(ChronoField.DAY_OF_WEEK, DayOfWeek.FRIDAY.getValue())
.with(LocalTime.of(22, 0));
LocalDateTime sun10Pm = ldt.with(ChronoField.DAY_OF_WEEK, DayOfWeek.SUNDAY.getValue())
.with(LocalTime.of(22, 0));
return ldt.isAfter(fri10Pm) && ldt.isBefore(sun10Pm);
}
}
Output:
false
true
true
true
false
使用舊版 API:
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Main {
public static void main(String[] args) throws ParseException {
// Test
System.out.println(isValidTime("2020-12-25T09:38:08"));// Should be false
System.out.println(isValidTime("2020-12-25T22:38:08"));// Should be true
System.out.println(isValidTime("2020-12-26T09:38:08"));// Should be true
System.out.println(isValidTime("2020-12-27T09:38:08"));// Should be true
System.out.println(isValidTime("2020-12-27T22:38:08"));// Should be false
}
static boolean isValidTime(String strDateTime) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date date = sdf.parse(strDateTime);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
calendar.set(Calendar.HOUR_OF_DAY, 22);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
Date fri10Pm = calendar.getTime();
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
calendar.set(Calendar.HOUR_OF_DAY, 22);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
Date sun10Pm = calendar.getTime();
return date.after(fri10Pm) && date.before(sun10Pm);
}
}
Output:
false
true
true
true
false
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