Java 各種時間上的操作範例
分享一些在專案中用到JAVA與日期相關的操作,包括:
- 取得目前的年、月、日
- 判斷兩個日期的大小
- 計算兩個日期的差距
- 取得昨天的日期
- 取得上個月的開始與結束日
package CDIT.stanley; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import java.util.Calendar; public class dateOperation { public static int differentDays(Date date1,Date date2){ Calendar cal1 = Calendar.getInstance(); cal1.setTime(date1); Calendar cal2 = Calendar.getInstance(); cal2.setTime(date2); int day1= cal1.get(Calendar.DAY_OF_YEAR); int day2 = cal2.get(Calendar.DAY_OF_YEAR); int year1 = cal1.get(Calendar.YEAR); int year2 = cal2.get(Calendar.YEAR); if(year1 != year2){ int timeDistance = 0 ; for(int i = year1 ; i < year2 ; i ++){ if(i%4==0 && i%100!=0 || i%400==0){ timeDistance += 366; } else{ timeDistance += 365; } } return timeDistance + (day2-day1) ; } else{ return day2-day1; } } public static Date getFirstMonthDay(Calendar calendar) { calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DATE)); return calendar.getTime(); } public static Date getLastMonthDay(Calendar calendar) { calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE)); return calendar.getTime(); } public static void main(String[] args) throws ParseException { //取得目前的年、月、日 Calendar calendar = Calendar.getInstance(); System.out.println("今天是" + calendar.get(Calendar.YEAR) + "年" + (calendar.get(Calendar.MONTH) + 1) + "月" + calendar.get(Calendar.DAY_OF_MONTH) + "日"); System.out.println("=================================================="); //輸出:今天是2017年8月24日 //判斷兩個日期的大小 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.TAIWAN); Date date1 = sdf.parse("2017-08-23"); Date date2 = sdf.parse("2016-09-22"); System.out.println("Date1 < Date2 : " + date1.before(date2)); System.out.println("Date1 > Date2 : " + date1.after(date2)); System.out.println("=================================================="); //輸出:Date1 < Date2 : false、Date1 > Date2 : true //計算兩個日期的差距 System.out.println("Date1 & Date2 差距 : " + differentDays(date1 , date2) + "天"); System.out.println("=================================================="); //輸出:Date1 & Date2 差距 : 31天 //取得昨天的日期 calendar = Calendar.getInstance(); calendar.add(Calendar.DATE, -1); String yestedayDate = sdf.format(calendar.getTime()); System.out.println("昨天是" + yestedayDate); System.out.println("=================================================="); //輸出:昨天是2017-08-23 //取得上個月的開始與結束日 calendar = Calendar.getInstance(); calendar.add(Calendar.MONTH,-1); String monthDayFirst = sdf.format(getFirstMonthDay(calendar)); String monthDayLast = sdf.format(getLastMonthDay(calendar)); System.out.println("上個月的第一天是" + monthDayFirst); System.out.println("上個月的最後一天是" + monthDayLast); System.out.println("=================================================="); //輸出:上個月的第一天是2017-07-01、上個月的最後一天是2017-07-31 } }
pharmacies in mexico that ship to usa mexican drugstore online mexico pharmacies prescription drugs
http://pharmindia.online/# п»їlegitimate online pharmacies india
https://pharmnoprescription.icu/# buy medication online no prescription
http://pharmmexico.online/# mexican mail order pharmacies
canadian online pharmacy no prescription: pharm world – cheapest pharmacy for prescription drugs
online meds no prescription: online pharmacy with prescription – best no prescription online pharmacies
canadian mail order prescriptions: buy prescription drugs without a prescription – buying prescription drugs online from canada
https://pharmworld.store/# rx pharmacy coupons
http://pharmcanada.shop/# my canadian pharmacy rx
online shopping pharmacy india top 10 pharmacies in india Online medicine order
canadian prescription prices: medicine with no prescription – prescription drugs canada
Great site ! I recommend everyone to watch it!https://vapesale24.com/collections/176-disposable-pods-
mexican pharmaceuticals online: п»їbest mexican online pharmacies – mexico drug stores pharmacies
prescription drugs canada: canada drugs no prescription – no prescription
Рекомендую надёжного Букмекера – 1win
Рекомендую топовую Букмекерскую контору 1win
Buy Vardenafil online: Levitra 20 mg for sale – Buy Vardenafil 20mg
Buy Vardenafil 20mg Buy generic Levitra online Buy Levitra 20mg online
simvastatin nine – zocor park lipitor protection
sildenafil over the counter: Buy Viagra online – sildenafil over the counter
Generic Tadalafil 20mg price buy cialis overseas Cialis 20mg price
https://kamagra.win/# Kamagra 100mg price
super kamagra: buy kamagra online – kamagra
http://kamagra.win/# Kamagra 100mg price
https://levitrav.store/# Levitra online pharmacy
Site excelente, recomendado Blaze apostas
Eu recomendo um cassino confiavel blaze apostas
http://cialist.pro/# Tadalafil Tablet
cheapest cenforce: Cenforce 100mg tablets for sale – Cenforce 150 mg online
cenforce for sale: Cenforce 100mg tablets for sale – cenforce.pro