如何使用java从当前日期减少一个月并存储在日期变量中？
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How to reduce one month from current date and stored in date variable using java?
提问by karthi
How to reduce one month from current date and want to sore in java.util.Datevariable
im using this code but it's shows error in 2nd line
如何从当前日期减少一个月并希望java.util.Date使用此代码在变量 im 中疼痛，但它在第二行显示错误
java.util.Date da = new Date();
da.add(Calendar.MONTH, -1); //error
How to store this date in java.util.Datevariable?
如何将此日期存储在java.util.Date变量中？
采纳答案by Aleksander Blomsk?ld
Use Calendar:
使用日历：
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, -1);
Date result = cal.getTime();
回答by Jigar Joshi
Calendar calNow = Calendar.getInstance()
// adding -1 month
calNow.add(Calendar.MONTH, -1);
// fetching updated time
Date dateBeforeAMonth = calNow.getTime();
回答by Ahiel
you can use Calendar
您可以使用 Calendar
java.util.Date da = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(da);
cal.add(Calendar.MONTH, -1);
da = cal.getTime();
回答by Fredszaq
回答by DVarga
Starting from Java 8, the suggested way is to use the Date-Time APIrather than Calendar.
从 Java 8 开始，建议的方法是使用Date-Time API而不是Calendar.
If you want a Dateobject to be returned:
如果你想Date返回一个对象：
Date date = Date.from(ZonedDateTime.now().minusMonths(1).toInstant());
If you don't need exactly a Dateobject, you can use the classes directly, provided by the package, even to get dates in other time-zones:
如果您不需要确切的Date对象，则可以直接使用包提供的类，甚至可以获取其他时区的日期：
ZonedDateTime dateInUTC = ZonedDateTime.now(ZoneId.of("Pacific/Auckland")).minusMonths(1);
回答by Gregory Alan Bolcer
Using new java.time package in Java8 and Java9
在 Java8 和 Java9 中使用新的 java.time 包
import java.time.LocalDate;
LocalDate mydate = LocalDate.now(); // Or whatever you want
mydate = mydate.minusMonths(1);
The advantage to using this method is that you avoid all the issues about varying month lengths and have more flexibility in adjusting dates and ranges. The Local part also is Timezone smart so it's easy to convert between them.
使用此方法的优点是您可以避免有关不同月份长度的所有问题，并且可以更灵活地调整日期和范围。本地部分也是时区智能，因此很容易在它们之间转换。
As an aside, using java.time you can also get the day of the week, day of the month, all days up to the last of the month, all days up to a certain day of the week, etc.
顺便说一句，使用 java.time 您还可以获得一周中的哪一天、一个月中的哪一天、直到本月最后一天的所有天数、直到一周中某一天的所有天数，等等。
mydate.plusMonths(1);
mydate.with(TemporalAdjusters.next(DayOfWeek.SUNDAY)).getDayOfMonth();
mydate.with(TemporalAdjusters.lastDayOfMonth());
回答by saeedmpt
raduce 1 month of JDF
提供 1 个月的 JDF
Date dateTo = new SimpleDateFormat("yyyy/MM/dd").parse(jdfMeTo.getJulianDate());
Calendar cal = Calendar.getInstance();
cal.setTime(dateTo);
cal.add(Calendar.MONTH, -1);
Date dateOf = cal.getTime();
Log.i("dateOf", dateOf.getTime() + "");
jdfMeOf.setJulianDate(cal.get(Calendar.DAY_OF_YEAR), cal.get(Calendar.DAY_OF_MONTH),
cal.get(Calendar.DAY_OF_WEEK_IN_MONTH));
