Here you can find the source of getFirstDate(Date today)
public static Date getFirstDate(Date today)
//package com.java2s; //License from project: Open Source License import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class Main { public static final String DF_YMD = "yyyy-MM-dd"; public static final String DF_HMS = "HH:mm:ss"; public static Date getFirstDate(Date today) { Calendar calendar = Calendar.getInstance(); calendar.setTime(today);/* ww w . j ava2 s . co m*/ calendar.set(Calendar.DATE, 1); return calendar.getTime(); } public static String getTime() { return dateToString(now(), DF_HMS); } public static String getTime(Date trialTime) { return dateToString(trialTime, DF_HMS); } public static String dateToString(Date date, String format) { if (date == null) { return ""; } synchronized (date) { SimpleDateFormat df = new SimpleDateFormat(format); return df.format(date); } } public static String dateToString(Date date) { return dateToString(date, DF_YMD); } public static Date now() { return new Date(); } }