Java Utililty Methods Yesterday

SimpleDateFormat simpleFormate = new SimpleDateFormat(pattern);
Calendar ca = Calendar.getInstance();
ca.setTime(new Date());
ca.add(Calendar.DAY_OF_YEAR, -1);
return simpleFormate.format(ca.getTime());

Calendar today = Calendar.getInstance();
today.add(Calendar.DATE, -1);
today.set(Calendar.HOUR, 6);
today.set(Calendar.AM_PM, Calendar.AM);
today.set(Calendar.MINUTE, 02);
today.set(Calendar.SECOND, 0);
today.set(Calendar.MILLISECOND, 0);
SimpleDateFormat outgoingFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS");
...

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
calendar.add(Calendar.DATE, -1);
return calendar.getTime();

Calendar cal = Calendar.getInstance();
cal.add(cal.DATE, -1);
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");
CurrentTime = formatter.format(cal.getTime());
return CurrentTime;

date = new Date(-1000L * 60 * 60 * 24 + date.getTime());
return date;

java.util.Calendar calendar = java.util.Calendar.getInstance();
calendar.add(Calendar.DATE, -(day));
java.util.Date beginDate = calendar.getTime();
SimpleDateFormat dateFmt = new SimpleDateFormat(PATTERN);
String yesterdayDate = dateFmt.format(beginDate);
return yesterdayDate;

Calendar day = Calendar.getInstance();
day.add(Calendar.DATE, -1);
SimpleDateFormat sdf = new SimpleDateFormat(format);
String date = sdf.format(day.getTime());
return date;

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DAY_OF_YEAR, -1);
Date yesterday = calendar.getTime();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(mysqlDateFormat);
return simpleDateFormat.format(yesterday);

Date today = new Date(); 
SimpleDateFormat formater; 
formater = new SimpleDateFormat(format);
Calendar cal = Calendar.getInstance();
cal.setTime(today);
cal.add(Calendar.HOUR, -24);
return formater.format(cal.getTime());

SimpleDateFormat formatter = new SimpleDateFormat(format, Locale.UK);
Date date = new Date();
date.setTime(date.getTime() - (1 * 1000 * 60 * 60 * 24));
return formatter.format(date);