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1 /** 2 * @param year 3 * @param month 4 * @param day 5 * @return 6 */ 7 public static String CaculateWeekDay(int y,int m,int d) 8 { 9 10 String strDate = y+"-"+m+"-"+d;// 定义日期字符串 11 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");// 定义日期格式 12 Date date = null; 13 try { 14 date = format.parse(strDate);// 将字符串转换为日期 15 }catch (ParseException e) { 16 } 17 Calendar c = Calendar.getInstance(); 18 c.setTime(date); 19 int dayForWeek = 0; 20 if(c.get(Calendar.DAY_OF_WEEK) == 1){ 21 dayForWeek = 7; 22 }else{ 23 dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1; 24 }
String day = "";
switch （dayFotWeek）
{
case 0:day = "周日";break;
case 1:day = "周一";break;
case 2:day = "周二";break;
case 3:day = "周三";break;
case 4:day = "周四";break;
case 5:day = "周五";break;
case 6:day = "周六";break;
}
25 return day; 26 27 }
使用案例： CaculateWeekDay（2015，3，2）得到的便是“周一”；
个人使用的日期工具类分享给大家:
1 /** 2 * 根据年月日，获取是周几 3 * @param year 4 * @param month 5 * @param day 6 * @return 7 */ 8 public static String CaculateWeekDay(int y,int m,int d) 9 { 10 11 String strDate = y+"-"+m+"-"+d;// 定义日期字符串 12 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");// 定义日期格式 13 Date date = null; 14 try { 15 date = format.parse(strDate);// 将字符串转换为日期 16 }catch (ParseException e) { 17 } 18 Calendar c = Calendar.getInstance(); 19 c.setTime(date); 20 int dayForWeek = 0; 21 if(c.get(Calendar.DAY_OF_WEEK) == 1){ 22 dayForWeek = 7; 23 }else{ 24 dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1; 25 } 26 return Integer.toString(dayForWeek); 27 28 } 29 30 31 /** 32 * 获取今日的日期，举例：20141110，20140110 33 * @return,日期的字符串 34 */ 35 public static String getNowDateString() 36 { 37 Date date = new Date(); 38 //年份 39 int year = date.getYear() + 1900; 40 //月份 41 int month = date.getMonth() + 1; 42 //日期 43 int day = date.getDate(); 44 45 String date_string ; 46 if(month < 10) 47 { 48 if(day < 10) 49 { 50 date_string = Integer.toString(year)+"0"+Integer.toString(month)+"0"+Integer.toString(day); 51 } 52 else 53 { 54 date_string = Integer.toString(year)+"0"+Integer.toString(month)+Integer.toString(day); 55 } 56 57 } 58 else 59 { 60 if(day < 10) 61 { 62 date_string = Integer.toString(year)+Integer.toString(month)+"0"+Integer.toString(day); 63 } 64 else 65 { 66 date_string = Integer.toString(year)+Integer.toString(month)+Integer.toString(day); 67 } 68 69 } 70 return date_string; 71 } 72 73 74 /** 75 * 获取今日包含时间点的日期，举例：2014020202(2014年2月2号2点) 76 * @return,日期的字符串 77 */ 78 public static String getNowDateAndHourString() 79 { 80 81 String date_string ; 82 String month_str; 83 String day_str; 84 String hour_str; 85 86 Date date = new Date(); 87 //年份 88 int year = date.getYear() + 1900; 89 //月份 90 int month = date.getMonth() + 1; 91 //日期 92 int day = date.getDate(); 93 //时间 94 int hour = date.getHours(); 95 96 //处理月份 97 if(month < 10) 98 { 99 month_str=0+Integer.toString(month); 100 } 101 else 102 { 103 month_str=Integer.toString(month); 104 } 105 106 //处理日期 107 if(day < 10) 108 { 109 day_str=0+Integer.toString(day); 110 } 111 else 112 { 113 day_str=Integer.toString(day); 114 } 115 116 //处理时间 117 if(hour < 10) 118 { 119 hour_str=0+Integer.toString(hour); 120 } 121 else 122 { 123 hour_str=Integer.toString(hour); 124 } 125 126 date_string = year+month_str+day_str+hour_str; 127 return date_string; 128 } 129 130 131 /** 132 * 函数功能是根据当前的日期，当step为正数时，算出加上step后的日期；step为负数时，算出减去step后的日期 133 * @param step：要加或者减的天数 134 * @return ：在当前日期的基础上加上或者减去step后的日期 135 */ 136 public static String getDate(int step) { 137 Calendar cal = Calendar.getInstance(); 138 cal.add(Calendar.DATE, step); 139 SimpleDateFormat sf = new SimpleDateFormat("yyyyMMdd"); 140 141 String str = sf.format(cal.getTime()); 142 143 System.out.print(str); 144 return str; 145 } 146 147 148 /** 149 *根据距离今天的日期差，得到是第几周周几：举例说今天是本年的第三周周四，那么getWeek(1)得到便是"第三周>周五" 150 * @param step 151 * @return 152 */ 153 public static String getWeek(int step) 154 { 155 Calendar cal = Calendar.getInstance(); 156 cal.add(Calendar.DATE, step); 157 158 int week = cal.get(cal.WEEK_OF_YEAR); 159 int day = cal.get(cal.DAY_OF_WEEK); 160 161 if(day == 1) 162 { 163 week = week -1; 164 } 165 day = day-1; 166 167 String [] day_of_week = {"日","一","二","三","四","五","六","日"}; 168 169 if(week == 0) 170 { 171 return "周"+day_of_week[day]; 172 } 173 174 String str = "第"+week+"周"+">周"+day_of_week[day]; 175 CommonUtils.LogWuwei(tag, "getWeek week is "+str+"day is "+day); 176 return str; 177 } 178 179 180 /** 181 * 根据距离今天的日期差，得到是周几：举例说今天是周二，那么getWeekDay(-1)得到的便是“周一” 182 * @param step 183 * @return 184 */ 185 public static String getWeekDay(int step) 186 { 187 Calendar cal = Calendar.getInstance(); 188 cal.add(Calendar.DATE, step); 189 190 int week = cal.get(cal.WEEK_OF_YEAR); 191 int day = cal.get(cal.DAY_OF_WEEK); 192 193 if(day == 1) 194 { 195 week = week -1; 196 } 197 day = day-1; 198 199 String [] day_of_week = {"日","一","二","三","四","五","六","日"}; 200 201 return "周"+day_of_week[day]; 202 203 } 204 205 206 /** 207 * 获取当前日期是星期几<br> 208 * 209 * @param dt 210 * @return 当前日期是星期几 211 */ 212 public static String getWeekOfDate() { 213 Date date=new Date(); 214 SimpleDateFormat dateFm = new SimpleDateFormat("EEEE"); 215 dateFm.format(date); 216 217 String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"}; 218 Calendar cal = Calendar.getInstance(); 219 cal.setTime(date); 220 int w = cal.get(Calendar.DAY_OF_WEEK) - 1; 221 if (w < 0) 222 w = 0; 223 CommonUtils.LogWuwei(tag,"今天是 "+weekDays[w]); 224 return weekDays[w]; 225 } 226 227 228 /** 229 * 根据日期获取时间戳 230 * @param normalDate 20141228 231 * @return 1419696000 232 */ 233 public static long getTimeStamp(Long normalDate) 234 { 235 Long detail_date_tmp = normalDate; 236 String date_str = Long.toString(detail_date_tmp); 237 String year = date_str.substring(0, 4); 238 String month = date_str.substring(4, 6); 239 String day = date_str.substring(6, 8); 240 //CommonUtils.LogWuwei(tag,"detail_date_tmp is "+detail_date_tmp+" "+ year+":"+month+":"+day); 241 242 SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); 243 Date date; 244 Calendar cal= Calendar.getInstance(); 245 String parseStr = year+"-"+month+"-"+day; 246 247 try { 248 date = df.parse(parseStr); 249 cal = Calendar.getInstance(); 250 cal.setTime(date); 251 } catch (ParseException e) { 252 // TODO Auto-generated catch block 253 e.printStackTrace(); 254 } 255 256 long timeStamp = cal.getTimeInMillis()/1000; 257 258 CommonUtils.LogWuwei(tag, "timeStamp is "+timeStamp); 259 260 return timeStamp; 261 } 262 263 264 /** 265 * 将”20141224” 解析成“2014年12月24日” 266 * @param date 267 * @return 268 */ 269 public static String parseDate(Long date) 270 { 271 int year = (int)(date/10000); 272 int month = (int)(date%10000)/100; 273 int day = (int)(date%10000)%100; 274 return year+"年"+month+"月"+day+"日"; 275 276 } 277 278 279 /** 280 * 获取当前日期是星期几<br> 281 * 282 * @param dt 283 * @return 当前日期是星期几 284 */ 285 public static int getIntWeekOfDate() { 286 Date date=new Date(); 287 SimpleDateFormat dateFm = new SimpleDateFormat("EEEE"); 288 dateFm.format(date); 289 290 int[] weekDays = {7,1,2,3,4,5,6}; 291 Calendar cal = Calendar.getInstance(); 292 cal.setTime(date); 293 int w = cal.get(Calendar.DAY_OF_WEEK) - 1; 294 if (w < 0) 295 w = 0; 296 // CommonUtils.LogWuwei(tag,"今天是 "+weekDays[w]); 297 return weekDays[w]; 298 } 299 300 /** 301 * 根据今天是周几获取上周周一到周日的日期 302 */ 303 public static String[] getLastWeekDate() 304 { 305 int today = CommonUtils.getIntWeekOfDate();//获取今天周几 306 String baseDate = "";//初始化上周一的日期 307 String date[] = {null,null,null,null,null,null,null}; 308 int index = 0; 309 switch (today)////得到上周一的日期 310 { 311 case 1: 312 baseDate = CommonUtils.getDate(-7); 313 index = -7; 314 break; 315 case 2: 316 baseDate = CommonUtils.getDate(-8); 317 index = -8; 318 break; 319 case 3: 320 baseDate = CommonUtils.getDate(-9); 321 index = -9; 322 break; 323 case 4: 324 baseDate = CommonUtils.getDate(-10); 325 index = -10; 326 break; 327 case 5: 328 baseDate = CommonUtils.getDate(-11); 329 index = -11; 330 break; 331 case 6: 332 baseDate = CommonUtils.getDate(-12); 333 index = -12; 334 break; 335 case 7: 336 baseDate = CommonUtils.getDate(-13); 337 index = -13; 338 break; 339 } 340 341 for(int i=0;i<7;i++) 342 { 343 date[i] = CommonUtils.getDate(index+i); 344 int k = i+1; 345 CommonUtils.LogWuwei(tag,"上周"+k+" is "+date[i]); 346 } 347 return date; 348 } 349 350 /** 351 * 根据本周周一到周日的日期 352 */ 353 public static String[] getThisWeekDate() 354 { 355 int today = CommonUtils.getIntWeekOfDate();//获取今天周几 356 String date[] = {null,null,null,null,null,null,null}; 357 int index = 0; 358 switch (today)////得到上周一的日期 359 { 360 case 1: 361 index = 0; 362 break; 363 case 2: 364 index = -1; 365 break; 366 case 3: 367 index = -2; 368 break; 369 case 4: 370 index = -3; 371 break; 372 case 5: 373 index = -4; 374 break; 375 case 6: 376 index = -5; 377 break; 378 case 7: 379 index = -6; 380 break; 381 } 382 383 for(int i=0;i<7;i++) 384 { 385 date[i] = CommonUtils.getDate(index+i); 386 int k = i+1; 387 CommonUtils.LogWuwei(tag,"本周"+k+" is "+date[i]); 388 } 389 return date; 390 } 391 392 393 /** 394 * 获取下周周一到周日的日期 395 */ 396 public static String[] getNextWeekDate() 397 { 398 int today = CommonUtils.getIntWeekOfDate();//获取今天周几 399 String date[] = {null,null,null,null,null,null,null}; 400 int index = 0; 401 switch (today)////得到下周的日期 402 { 403 case 1: 404 index = 7; 405 break; 406 case 2: 407 index = 6; 408 break; 409 case 3: 410 index = 5; 411 break; 412 case 4: 413 index = 4; 414 break; 415 case 5: 416 index = 3; 417 break; 418 case 6: 419 index = 2; 420 break; 421 case 7: 422 index = 1; 423 break; 424 } 425 426 for(int i=0;i<7;i++) 427 { 428 date[i] = CommonUtils.getDate(index+i); 429 int k = i+1; 430 CommonUtils.LogWuwei(tag,"下周"+k+" is "+date[i]); 431 } 432 return date; 433 } 434 435 436 /** 437 * 从今天起往前寻找8周内每个周一的日期 438 */ 439 public static long[] checkRecentEfficientDataFromToday() 440 { 441 long modayData[] = new long[8]; 442 int today = getIntWeekOfDate();//获取今天是周几 443 int step = 0; 444 switch (today) 445 { 446 case 1: 447 step = 0; 448 break; 449 case 2: 450 step = -1; 451 break; 452 case 3: 453 step = -2; 454 break; 455 case 4: 456 step = -3; 457 break; 458 case 5: 459 step = -4; 460 break; 461 case 6: 462 step = -5; 463 break; 464 case 7: 465 step = -6; 466 break; 467 } 468 469 for(int i=0;i<8;i++) 470 { 471 modayData[i] = Long.parseLong(getDate(step-7*i)); 472 CommonUtils.LogWuwei(tag, "monday date is "+modayData[i]); 473 } 474 return modayData; 475 } 476 477 /** 478 * 获取到本周一的日期 479 * @return 480 */ 481 public static long getThisMonday() 482 { 483 int today = getIntWeekOfDate();//获取今天是周几 484 long monday = (long)0; 485 int step = 0; 486 switch (today) 487 { 488 case 1: 489 step = 0; 490 break; 491 case 2: 492 step = -1; 493 break; 494 case 3: 495 step = -2; 496 break; 497 case 4: 498 step = -3; 499 break; 500 case 5: 501 step = -4; 502 break; 503 case 6: 504 step = -5; 505 break; 506 case 7: 507 step = -6; 508 break; 509 } 510 monday = Long.parseLong(getNowDateString())+step; 511 return monday; 512 } 513 514 /** 515 * 获取到上周的周一是几号 516 * @return 517 */ 518 public static long getLastMonday() 519 { 520 int today = getIntWeekOfDate();//获取今天是周几 521 long monday = (long)0; 522 int step = 0; 523 switch (today) 524 { 525 case 1: 526 step = 0; 527 break; 528 case 2: 529 step = -1; 530 break; 531 case 3: 532 step = -2; 533 break; 534 case 4: 535 step = -3; 536 break; 537 case 5: 538 step = -4; 539 break; 540 case 6: 541 step = -5; 542 break; 543 case 7: 544 step = -6; 545 break; 546 } 547 monday = Long.parseLong(getNowDateString())-7+step; 548 return monday; 549 } 550 551 /** 552 * 获取到下周的周一是几号 553 * @return 554 */ 555 public static long getNextMonday() 556 { 557 int today = getIntWeekOfDate();//获取今天是周几 558 long monday = (long)0; 559 int step = 0; 560 switch (today) 561 { 562 case 1: 563 step = 0; 564 break; 565 case 2: 566 step = -1; 567 break; 568 case 3: 569 step = -2; 570 break; 571 case 4: 572 step = -3; 573 break; 574 case 5: 575 step = -4; 576 break; 577 case 6: 578 step = -5; 579 break; 580 case 7: 581 step = -6; 582 break; 583 } 584 monday = Long.parseLong(getNowDateString())+7+step; 585 return monday; 586 } 587
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原文地址：http://www.cnblogs.com/kunyashaw/p/4308557.html
