Java 将自历元起的时间(毫秒)转换为;年月日;
我正在将一个日期字符串转换为毫秒,如下所示Java 将自历元起的时间(毫秒)转换为;年月日;,java,date,jodatime,Java,Date,Jodatime,我正在将一个日期字符串转换为毫秒,如下所示 import org.joda.time.DateTime; import org.joda.time.DateTimeZone; import org.joda.time.format.DateTimeFormat; import org.joda.time.format.DateTimeFormatter; private static final DateTimeZone PST = DateTimeZone.forID("PST8PDT")
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
private static final DateTimeZone PST = DateTimeZone.forID("PST8PDT");
private static final DateTimeFormatter DATE_FORMATTER =
DateTimeFormat.forPattern("yyyy-MM-dd").withZone(PST);
Long millis = DateTime.parse(startDate, DATE_FORMATTER).withTimeAtStartOfDay().getMillis());
其中startDate是我要转换的日期
当我有millis时,如何对其进行反向工程以获取PST中的日期?简单地构造一个新对象就可以了
DateTime newDate = new DateTime(millis);
如果我理解你的问题,你可以用 从链接的Javadoc 将毫秒瞬间打印到字符串
使用
Java.time
api的Java 8解决方案,该解决方案将给定字符串转换为毫秒,毫秒转换为字符串日期(考虑时区):
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
public class SO25788709 {
public static void main(String[] args) {
String strDate = "2014-09-12 23:59:59";
String pattern = "yyyy-MM-dd HH:mm:ss";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
ZoneId zone = ZoneId.of("America/Los_Angeles");
long milli = getMillis(strDate, formatter, zone);
System.out.println(milli);
String retStrDate = getDateString(milli, formatter, zone);
System.out.println(retStrDate);
}
private static long getMillis(String strDate, DateTimeFormatter formatter, ZoneId zone) {
LocalDateTime localDateTime = LocalDateTime.parse(strDate, formatter);
ZonedDateTime zonedDateTime = ZonedDateTime.of(localDateTime, zone);
Instant instant = zonedDateTime.toInstant();
long milli = instant.toEpochMilli();
return milli;
}
private static String getDateString(long milli, DateTimeFormatter formatter, ZoneId zone) {
Instant instant = Instant.ofEpochMilli(milli);
ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, zone);
String strDate = zonedDateTime.format(formatter);
return strDate;
}
}
我创建了两个足够灵活的方法,可以处理任何时区的任何日期格式 第一种方法是从日期字符串到毫秒(历元) 第二种方法是从毫秒到日期字符串
//dateInMillis to date format yyyy-MM-dd
private static String formatterMillistoDate(long dateInMillis, String format, String timeZone){
//define your format
DateTimeFormatter customFormat = DateTimeFormat.forPattern(format);
//convert to DateTime with your desired TimeZone
DateTime dateTime = new DateTime(dateInMillis, DateTimeZone.forID(timeZone));
//return date String in format you defined
return customFormat.print(dateTime);
}
为main()方法尝试以下输入:
您应该获得以下输出:
1426575600000
2015-03-17
希望这有帮助!;) 我将如何用它指定时区?它可以用第二个参数timezone重载。我不确定PST的正确值是多少,但我相信您可以找到它。在帖子中链接。你应该使用“美国/洛杉矶”而不是“PST”或“PST8PDT”,因为Joda Time强烈喜欢第一种格式。时区名称及其缩写通常不是唯一的。PST也可能意味着巴基斯坦标准时间,而Joda Time在解析这些缩写时遇到了很大的问题。
//dateString to long
private static long formatterDateToMillis(String dateString, String format, String timeZone){
//define Timezone, in your case you hardcoded "PST8PDT" for PST
DateTimeZone yourTimeZone = DateTimeZone.forID(timeZone);
//define your pattern
DateTimeFormatter customFormat = DateTimeFormat.forPattern(format).withZone(yourTimeZone);
//parse dateString to the format you wanted
DateTime dateTime = customFormat.parseDateTime(dateString);
//return in Millis, usually in epoch
return dateTime.getMillis();
}
//dateInMillis to date format yyyy-MM-dd
private static String formatterMillistoDate(long dateInMillis, String format, String timeZone){
//define your format
DateTimeFormatter customFormat = DateTimeFormat.forPattern(format);
//convert to DateTime with your desired TimeZone
DateTime dateTime = new DateTime(dateInMillis, DateTimeZone.forID(timeZone));
//return date String in format you defined
return customFormat.print(dateTime);
}
long valueInMillis = formatterDateToMillis("2015-03-17","yyyy-MM-dd","PST8PDT");
System.out.println(valueInMillis);
String formattedInDate = formatterMillistoDate(1426575600000L,"yyyy-MM-dd","PST8PDT");
System.out.println(formattedInDate);