Java operation time, reducing current time by one year, minus day, minus one months

When working with time in Java, you often encounter some values for a period of time, or calculate the number of days between periods

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1. Date date = new Date (); Get current time
2. Calendar calendar = Calendar.getinstance ();
3. Calendar.settime (date);
4. Calendar.add (Calendar.year,-1); The current time minus one year, that is, one year ago
5. Calendar.add (Calendar.month,-1); One months before the current time, that is, one months before the time
6. Calendar.gettime (); //Get time a year ago, or one months ago

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Java operation time, reducing current time by one year, minus day, minus one months