Java SimpleDataFormat getHours()返回不正确的值
为什么09:50返回8小时? 代码:Java SimpleDataFormat getHours()返回不正确的值,java,android,simpledateformat,Java,Android,Simpledateformat,为什么09:50返回8小时? 代码: 日期已弃用。你应该使用日历 SimpleDateFormat sdf = new SimpleDateFormat("HH:mm"); Date date = sdf.parse("09:50"); Calendar cal = new GregorianCalendar(); cal.setTime(date); int hours = cal.get(Calendar.HOR_OF_DAY); PD:记住日历类中的字段月从0开始0-1月,1-2月
日期已弃用。你应该使用日历
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
Date date = sdf.parse("09:50");
Calendar cal = new GregorianCalendar();
cal.setTime(date);
int hours = cal.get(Calendar.HOR_OF_DAY);
PD:记住日历类中的字段月从0开始0-1月,1-2月。。。
PD2:我在过滤器日志上有一个名为printf的个性化标签。将其更改为您使用的标记。您的SimpleDateFormat可能未设置为默认时区。 电话: 在解析文本之前,应该解决您的问题。 我已经测试了以下代码:
...
public static final SimpleDateFormat CDfTimestamp = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
...
Date da1 = null;
for (String dl1 : new String[] { "1970-01-01 12:34:56",
"2016-01-01 12:34:56" }) {
try {
CDfTimestamp.setTimeZone(TimeZone.getTimeZone("GMT+05:00"));
da1 = CDfTimestamp.parse(dl1);
System.out.printf("parse GMT+05:00 %s -> %d %d %d (os=%d)\n", dl1, da1
.getHours(), da1.getMinutes(), da1.getSeconds(), CDfTimestamp
.getTimeZone().getOffset(0));
CDfTimestamp.setTimeZone(TimeZone.getTimeZone("UTC"));
da1 = CDfTimestamp.parse(dl1);
System.out.printf("parse UTC %s -> %d %d %d (os=%d)\n", dl1, da1
.getHours(), da1.getMinutes(), da1.getSeconds(), CDfTimestamp
.getTimeZone().getOffset(0));
CDfTimestamp.setTimeZone(TimeZone.getDefault());
da1 = CDfTimestamp.parse(dl1);
System.out.printf("parse default %s -> %d %d %d (os=%d)\n", dl1, da1
.getHours(), da1.getMinutes(), da1.getSeconds(), CDfTimestamp
.getTimeZone().getOffset(0));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
...
获得以下输出:
parse GMT+05:00 1970-01-01 12:34:56 -> 8 34 56 (os=18000000)
parse UTC 1970-01-01 12:34:56 -> 13 34 56 (os=0)
parse default 1970-01-01 12:34:56 -> 12 34 56 (os=3600000)
parse GMT+05:00 2016-01-01 12:34:56 -> 8 34 56 (os=18000000)
parse UTC 2016-01-01 12:34:56 -> 13 34 56 (os=0)
parse default 2016-01-01 12:34:56 -> 12 34 56 (os=3600000)
getHours已被弃用。你甚至不应该使用它。SimpleDateFormat是地区敏感的,你的时区不是GMT-1吗?此外,考虑使用JoDA时间而不是java的构建日期函数。这一次,SimpleDataFormat不是线程安全的,而Joda Time的DateTimeFormatter是。您想要当前时间吗?我无法复制。我得到9。日期不推荐了吗?这是一种误导性和不正确的说法。请纠正这个。
sdf.setTimeZone(TimeZone.getDefault());
...
public static final SimpleDateFormat CDfTimestamp = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
...
Date da1 = null;
for (String dl1 : new String[] { "1970-01-01 12:34:56",
"2016-01-01 12:34:56" }) {
try {
CDfTimestamp.setTimeZone(TimeZone.getTimeZone("GMT+05:00"));
da1 = CDfTimestamp.parse(dl1);
System.out.printf("parse GMT+05:00 %s -> %d %d %d (os=%d)\n", dl1, da1
.getHours(), da1.getMinutes(), da1.getSeconds(), CDfTimestamp
.getTimeZone().getOffset(0));
CDfTimestamp.setTimeZone(TimeZone.getTimeZone("UTC"));
da1 = CDfTimestamp.parse(dl1);
System.out.printf("parse UTC %s -> %d %d %d (os=%d)\n", dl1, da1
.getHours(), da1.getMinutes(), da1.getSeconds(), CDfTimestamp
.getTimeZone().getOffset(0));
CDfTimestamp.setTimeZone(TimeZone.getDefault());
da1 = CDfTimestamp.parse(dl1);
System.out.printf("parse default %s -> %d %d %d (os=%d)\n", dl1, da1
.getHours(), da1.getMinutes(), da1.getSeconds(), CDfTimestamp
.getTimeZone().getOffset(0));
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
...
parse GMT+05:00 1970-01-01 12:34:56 -> 8 34 56 (os=18000000)
parse UTC 1970-01-01 12:34:56 -> 13 34 56 (os=0)
parse default 1970-01-01 12:34:56 -> 12 34 56 (os=3600000)
parse GMT+05:00 2016-01-01 12:34:56 -> 8 34 56 (os=18000000)
parse UTC 2016-01-01 12:34:56 -> 13 34 56 (os=0)
parse default 2016-01-01 12:34:56 -> 12 34 56 (os=3600000)