如何获取本周,本月,本日的开始时间和结束时间的时间戳
计算机系统时间提取的正确方法

计算机系统时间提取的正确方法
正确提取计算机系统时间的方法取决于应用场景和需求。
以下是几种常见的方法:
1. 使用系统调用函数:在 C 语言中,可以使用系统调用函数gettimeofday() 来获取当前系统时间。
该函数会返回两个值,分别是秒和毫秒,它们可以用于计算时间差。
2. 使用计时器:可以使用计时器来定期获取当前时间,并将其记录下来。
这种方法适用于需要频繁获取时间的场景,例如实时监控和统计。
3. 使用日志文件:操作系统通常会生成日志文件,记录各种事件和时间戳。
可以使用日志分析工具来提取时间信息,以帮助确定时间差和时间戳。
4. 使用第三方时间库:对于一些需要高精度和时间稳定性的应用,可以使用第三方时间库,例如 time.h 库或 libtime 库。
这些库提供了各种时间测量和计算函数,可以方便地获取当前时间。
需要根据具体应用场景选择正确的方法来提取计算机系统时间。
在实际应用中,还需要注意时间的准确性和稳定性,以确保计算结果
的正确性和可靠性。
js获取本周、上周、本月、上月、本季度、上季度的开始结束日期

js获取本周、上周、本⽉、上⽉、本季度、上季度的开始结束⽇期js 获取本周、上周、本⽉、上⽉、本季度、上季度的开始结束⽇期/*** 获取本周、本季度、本⽉、上⽉的开始⽇期、结束⽇期*/var now = new Date(); //当前⽇期var nowDayOfWeek = now.getDay(); //今天本周的第⼏天var nowDay = now.getDate(); //当前⽇var nowMonth = now.getMonth(); //当前⽉var nowYear = now.getYear(); //当前年nowYear += (nowYear < 2000) ? 1900 : 0; //var lastMonthDate = new Date(); //上⽉⽇期lastMonthDate.setDate(1);lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);var lastYear = lastMonthDate.getYear();var lastMonth = lastMonthDate.getMonth();//格式化⽇期:yyyy-MM-ddfunction formatDate(date) {var myyear = date.getFullYear();var mymonth = date.getMonth() + 1;var myweekday = date.getDate();if (mymonth < 10) {mymonth = "0" + mymonth;}if (myweekday < 10) {myweekday = "0" + myweekday;}return (myyear + "-" + mymonth + "-" + myweekday);}//获得某⽉的天数function getMonthDays(myMonth) {var monthStartDate = new Date(nowYear, myMonth, 1);var monthEndDate = new Date(nowYear, myMonth + 1, 1);var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);return days;}//获得本季度的开始⽉份function getQuarterStartMonth() {var quarterStartMonth = 0;if (nowMonth < 3) {quarterStartMonth = 0;}if (2 < nowMonth && nowMonth < 6) {quarterStartMonth = 3;}if (5 < nowMonth && nowMonth < 9) {quarterStartMonth = 6;}if (nowMonth > 8) {quarterStartMonth = 9;}return quarterStartMonth;}//获得本周的开始⽇期function getWeekStartDate() {var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);return formatDate(weekStartDate);}//获得本周的结束⽇期function getWeekEndDate() {var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));return formatDate(weekEndDate);}//获得上周的开始⽇期function getLastWeekStartDate() {var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek - 7);return formatDate(weekStartDate);}//获得上周的结束⽇期function getLastWeekEndDate() {var weekEndDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek - 1);return formatDate(weekEndDate);}//获得本⽉的开始⽇期function getMonthStartDate() {var monthStartDate = new Date(nowYear, nowMonth, 1);return formatDate(monthStartDate);}//获得本⽉的结束⽇期function getMonthEndDate() {var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));return formatDate(monthEndDate);}//获得上⽉开始时间function getLastMonthStartDate() {var lastMonthStartDate = new Date(nowYear, lastMonth, 1);return formatDate(lastMonthStartDate);}//获得上⽉结束时间function getLastMonthEndDate() {var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth));return formatDate(lastMonthEndDate);}//获得本季度的开始⽇期function getQuarterStartDate() {var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);return formatDate(quarterStartDate);}//或的本季度的结束⽇期function getQuarterEndDate() {var quarterEndMonth = getQuarterStartMonth() + 2;var quarterStartDate = new Date(nowYear, quarterEndMonth,getMonthDays(quarterEndMonth));return formatDate(quarterStartDate);}js 计算⽉/周的第⼀天和最后⼀天因为项⽬开发中遇到需要向后台传本周的开始和结束时间,以及上⼀周的起⽌时间,就琢磨了半天,总算写出来⼀套,写篇⽂章是为了⽅便⾃⼰记忆,也是分享给需要的⼈,⽔平有限,写的不好请见谅:getDateStr3函数是为了把时间对象转变为yy-mm-dd的字符串,⽅便传值;getWeekStartAndEnd函数是获取周的起⽌时间,并且⽤getDateStr3转换成字符串放到数组中,其中参数0代表当前周,-1代表前⼀周,-2代表上上周,以此类推,反过来也可以1代表下⼀周;getMonthStartAndEnd函数是获取⽉的起⽌时间,传参同上//获取当前⽇期yy-mm-dd//date 为时间对象function getDateStr3(date) {var year = "";var month = "";var day = "";var now = date;year = ""+now.getFullYear();if((now.getMonth()+1)<10){month = "0"+(now.getMonth()+1);}else{month = ""+(now.getMonth()+1);}if((now.getDate())<10){day = "0"+(now.getDate());}else{day = ""+(now.getDate());}return year+"-"+month+"-"+day;}/*** 获得相对当前周AddWeekCount个周的起⽌⽇期* AddWeekCount为0代表当前周为-1代表上⼀个周为1代表下⼀个周以此类推* **/function getWeekStartAndEnd(AddWeekCount) {//起⽌⽇期数组var startStop = new Array();//⼀天的毫秒数var millisecond = 1000 * 60 * 60 * 24;//获取当前时间var currentDate = new Date();//相对于当前⽇期AddWeekCount个周的⽇期currentDate = new Date(currentDate.getTime() + (millisecond * 7*AddWeekCount));//返回date是⼀周中的某⼀天var week = currentDate.getDay();//返回date是⼀个⽉中的某⼀天var month = currentDate.getDate();//减去的天数var minusDay = week != 0 ? week - 1 : 6;//获得当前周的第⼀天var currentWeekFirstDay = new Date(currentDate.getTime() - (millisecond * minusDay)); //获得当前周的最后⼀天var currentWeekLastDay = new Date(currentWeekFirstDay.getTime() + (millisecond * 6)); //添加⾄数组startStop.push(getDateStr3(currentWeekFirstDay));startStop.push(getDateStr3(currentWeekLastDay));return startStop;}/*** 获得相对当⽉AddMonthCount个⽉的起⽌⽇期* AddMonthCount为0 代表当⽉为-1代表上⼀个⽉为1代表下⼀个⽉以此类推* ***/function getMonthStartAndEnd(AddMonthCount) {//起⽌⽇期数组var startStop = new Array();//获取当前时间var currentDate = new Date();var month=currentDate.getMonth()+AddMonthCount;if(month<0){var n = parseInt((-month)/12);month += n*12;currentDate.setFullYear(currentDate.getFullYear()-n);}currentDate = new Date(currentDate.setMonth(month));//获得当前⽉份0-11var currentMonth = currentDate.getMonth();//获得当前年份4位年var currentYear = currentDate.getFullYear();//获得上⼀个⽉的第⼀天var currentMonthFirstDay = new Date(currentYear, currentMonth,1);//获得上⼀⽉的最后⼀天var currentMonthLastDay = new Date(currentYear, currentMonth+1, 0);//添加⾄数组startStop.push(getDateStr3(currentMonthFirstDay));startStop.push(getDateStr3(currentMonthLastDay));//返回return startStop;}好了这篇⽂章就介绍到这了。
java获取当天,前天,明天,本周,本月,本年的开始日期时间和结束日期时间

java获取当天,前天,明天,本周,本⽉,本年的开始⽇期时间和结束⽇期时间1package demoone;23import java.sql.Timestamp;4import java.text.ParseException;5import java.text.SimpleDateFormat;6import java.util.ArrayList;7import java.util.Calendar;8import java.util.Date;9import java.util.GregorianCalendar;10import java.util.List;1112public class DateUtils {13//获取当天的开始时间14public static java.util.Date getDayBegin() {15 Calendar cal = new GregorianCalendar();16 cal.set(Calendar.HOUR_OF_DAY, 0);17 cal.set(Calendar.MINUTE, 0);18 cal.set(Calendar.SECOND, 0);19 cal.set(LISECOND, 0);20return cal.getTime();21 }22//获取当天的结束时间23public static java.util.Date getDayEnd() {24 Calendar cal = new GregorianCalendar();25 cal.set(Calendar.HOUR_OF_DAY, 23);26 cal.set(Calendar.MINUTE, 59);27 cal.set(Calendar.SECOND, 59);28return cal.getTime();29 }30//获取昨天的开始时间31public static Date getBeginDayOfYesterday() {32 Calendar cal = new GregorianCalendar();33 cal.setTime(getDayBegin());34 cal.add(Calendar.DAY_OF_MONTH, -1);35return cal.getTime();36 }37//获取昨天的结束时间38public static Date getEndDayOfYesterDay() {39 Calendar cal = new GregorianCalendar();40 cal.setTime(getDayEnd());41 cal.add(Calendar.DAY_OF_MONTH, -1);42return cal.getTime();43 }44//获取明天的开始时间45public static Date getBeginDayOfTomorrow() {46 Calendar cal = new GregorianCalendar();47 cal.setTime(getDayBegin());48 cal.add(Calendar.DAY_OF_MONTH, 1);4950return cal.getTime();51 }52//获取明天的结束时间53public static Date getEndDayOfTomorrow() {54 Calendar cal = new GregorianCalendar();55 cal.setTime(getDayEnd());56 cal.add(Calendar.DAY_OF_MONTH, 1);57return cal.getTime();58 }59//获取本周的开始时间60public static Date getBeginDayOfWeek() {61 Date date = new Date();62if (date == null) {63return null;64 }65 Calendar cal = Calendar.getInstance();66 cal.setTime(date);67int dayofweek = cal.get(Calendar.DAY_OF_WEEK);68if (dayofweek == 1) {69 dayofweek += 7;70 }71 cal.add(Calendar.DATE, 2 - dayofweek);72return getDayStartTime(cal.getTime());73 }74//获取本周的结束时间75public static Date getEndDayOfWeek(){76 Calendar cal = Calendar.getInstance();77 cal.setTime(getBeginDayOfWeek());78 cal.add(Calendar.DAY_OF_WEEK, 6);79 Date weekEndSta = cal.getTime();80return getDayEndTime(weekEndSta);81 }82//获取本⽉的开始时间83public static Date getBeginDayOfMonth() {84 Calendar calendar = Calendar.getInstance();85 calendar.set(getNowYear(), getNowMonth() - 1, 1);86return getDayStartTime(calendar.getTime());87 }88//获取本⽉的结束时间89public static Date getEndDayOfMonth() {90 Calendar calendar = Calendar.getInstance();91 calendar.set(getNowYear(), getNowMonth() - 1, 1);92int day = calendar.getActualMaximum(5);93 calendar.set(getNowYear(), getNowMonth() - 1, day);94return getDayEndTime(calendar.getTime());95 }96//获取本年的开始时间97public static java.util.Date getBeginDayOfYear() {98 Calendar cal = Calendar.getInstance();99 cal.set(Calendar.YEAR, getNowYear());100// cal.set101 cal.set(Calendar.MONTH, Calendar.JANUARY);102 cal.set(Calendar.DATE, 1);103104return getDayStartTime(cal.getTime());105 }106//获取本年的结束时间107public static java.util.Date getEndDayOfYear() {108 Calendar cal = Calendar.getInstance();109 cal.set(Calendar.YEAR, getNowYear());110 cal.set(Calendar.MONTH, Calendar.DECEMBER);111 cal.set(Calendar.DATE, 31);112return getDayEndTime(cal.getTime());113 }114//获取某个⽇期的开始时间115public static Timestamp getDayStartTime(Date d) {116 Calendar calendar = Calendar.getInstance();117if(null != d) calendar.setTime(d);118 calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0);119 calendar.set(LISECOND, 0);120return new Timestamp(calendar.getTimeInMillis());121 }122//获取某个⽇期的结束时间123public static Timestamp getDayEndTime(Date d) {124 Calendar calendar = Calendar.getInstance();125if(null != d) calendar.setTime(d);126 calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23, 59, 59); 127 calendar.set(LISECOND, 999);128return new Timestamp(calendar.getTimeInMillis());129 }130//获取今年是哪⼀年131public static Integer getNowYear() {132 Date date = new Date();133 GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();134 gc.setTime(date);135return Integer.valueOf(gc.get(1));136 }137//获取本⽉是哪⼀⽉138public static int getNowMonth() {139 Date date = new Date();140 GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();141 gc.setTime(date);142return gc.get(2) + 1;143 }144//两个⽇期相减得到的天数145public static int getDiffDays(Date beginDate, Date endDate) {146147if (beginDate == null || endDate == null) {148throw new IllegalArgumentException("getDiffDays param is null!");149 }150151long diff = (endDate.getTime() - beginDate.getTime())152 / (1000 * 60 * 60 * 24);153154int days = new Long(diff).intValue();155156return days;157 }158//两个⽇期相减得到的毫秒数159public static long dateDiff(Date beginDate, Date endDate) {160long date1ms = beginDate.getTime();161long date2ms = endDate.getTime();162return date2ms - date1ms;163 }164//获取两个⽇期中的最⼤⽇期165public static Date max(Date beginDate, Date endDate) {166if (beginDate == null) {167return endDate;168 }169if (endDate == null) {170return beginDate;171 }172if (beginDate.after(endDate)) {173return beginDate;174 }175return endDate;176 }177//获取两个⽇期中的最⼩⽇期178public static Date min(Date beginDate, Date endDate) {179if (beginDate == null) {180return endDate;181 }182if (endDate == null) {183return beginDate;184 }185if (beginDate.after(endDate)) {186return endDate;187 }188return beginDate;189 }190//返回某⽉该季度的第⼀个⽉191public static Date getFirstSeasonDate(Date date) {192final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };193 Calendar cal = Calendar.getInstance();194 cal.setTime(date);195int sean = SEASON[cal.get(Calendar.MONTH)];196 cal.set(Calendar.MONTH, sean * 3 - 3);197return cal.getTime();198 }199//返回某个⽇期下⼏天的⽇期200public static Date getNextDay(Date date, int i) {201 Calendar cal = new GregorianCalendar();202 cal.setTime(date);203 cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);204return cal.getTime();205 }206//返回某个⽇期前⼏天的⽇期207public static Date getFrontDay(Date date, int i) {208 Calendar cal = new GregorianCalendar();209 cal.setTime(date);210 cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);211return cal.getTime();212 }213//获取某年某⽉到某年某⽉按天的切⽚⽇期集合(间隔天数的⽇期集合)214public static List getTimeList(int beginYear, int beginMonth, int endYear, 215int endMonth, int k) {216 List list = new ArrayList();217if (beginYear == endYear) {218for (int j = beginMonth; j <= endMonth; j++) {219 list.add(getTimeList(beginYear, j, k));220221 }222 } else {223 {224for (int j = beginMonth; j < 12; j++) {225 list.add(getTimeList(beginYear, j, k));226 }227228for (int i = beginYear + 1; i < endYear; i++) {229for (int j = 0; j < 12; j++) {230 list.add(getTimeList(i, j, k));231 }232 }233for (int j = 0; j <= endMonth; j++) {234 list.add(getTimeList(endYear, j, k));235 }236 }237 }238return list;239 }240//获取某年某⽉按天切⽚⽇期集合(某个⽉间隔多少天的⽇期集合)241public static List getTimeList(int beginYear, int beginMonth, int k) {242 List list = new ArrayList();243 Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1); 244int max = begincal.getActualMaximum(Calendar.DATE);245for (int i = 1; i < max; i = i + k) {246 list.add(begincal.getTime());247 begincal.add(Calendar.DATE, k);248 }249 begincal = new GregorianCalendar(beginYear, beginMonth, max);250 list.add(begincal.getTime());251return list;252 }253 }1//获取某年某⽉的第⼀天⽇期2public static Date getStartMonthDate(int year, int month) {3 Calendar calendar = Calendar.getInstance();4 calendar.set(year, month - 1, 1);5return calendar.getTime();6 }78//获取某年某⽉的最后⼀天⽇期9public static Date getEndMonthDate(int year, int month) {10 Calendar calendar = Calendar.getInstance();11 calendar.set(year, month - 1, 1);12int day = calendar.getActualMaximum(5);13 calendar.set(year, month - 1, day);14return calendar.getTime();15 }DateUtils。
js获取本日、本周、本月的时间代码

js获取本⽇、本周、本⽉的时间代码本⽇时间function showToDay(){var Nowdate=new Date();M=Number(Nowdate.getMonth())+1alert(Nowdate.getMonth()+"⽉,"+Nowdate.getDate()+"号,星期"+Nowdate.getDay());return Nowdate.getYear()+"-"+M+"-"+Nowdate.getDate();}昨天function showTomorrow(){var tom=new Date();tom.setDate(tom.getDate()+1);M=Number(tom.getMonth())+1return tom.getYear()+"-"+M+"-"+tom.getDate();}本周第⼀天function showWeekFirstDay(){var Nowdate=new Date();var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);M=Number(WeekFirstDay.getMonth())+1return WeekFirstDay.getYear()+"-"+M+"-"+WeekFirstDay.getDate();}本周最后天function showWeekLastDay(){var Nowdate=new Date();var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);M=Number(WeekLastDay.getMonth())+1return WeekLastDay.getYear()+"-"+M+"-"+WeekLastDay.getDate();}本⽉第⼀天function showMonthFirstDay(){var Nowdate=new Date();var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1);M=Number(MonthFirstDay.getMonth())+1return MonthFirstDay.getYear()+"-"+M+"-"+MonthFirstDay.getDate();}本⽉最后⼀天function showMonthLastDay(){var Nowdate=new Date();var MonthNextFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1);var MonthLastDay=new Date(MonthNextFirstDay-86400000);M=Number(MonthLastDay.getMonth())+1return MonthLastDay.getYear()+"-"+M+"-"+MonthLastDay.getDate();}function getTime(s){var time1=document.getElementById("num1");var time2=document.getElementById("num2");if(s==1){//本⽇时间time1.value=showToDay();//alert("今⽇:"+time1.value);time2.value=showTomorrow();//alert("今⽇:"+time2.value);}else if(s==2){//本周时间time1.value=showWeekFirstDay();//alert("本⽉第⼀天:"+time1.value);time2.value=showWeekLastDay();//alert("本⽉最后⼀天:"+time2.value);}else{//本⽉时间time1.value=showMonthFirstDay();//alert("本⽉第⼀天"+time1.value);time2.value=showMonthLastDay();//alert("本⽉最后⼀天"+time2.value);}}其他⽹友补充的完整测试代码<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title></head><body><input type="text" id="dateFrom" value=""><input type="text" id="dateTo" value=""><script>window.onload = function() {// getDate("thisDay");// getDate("thisWeek");// getDate("thisMonth");getDate("thisYear");}//获取推送时间段function getDate(type){var kssj,jssj;var today = new Date();var DAY = 1000*60*60*24;if(type =="thisDay") { //当天kssj = new Date();jssj = new Date();}if(type == "thisWeek") { //本周周kssj = getThisWeekFirstDay();//本周第⼀天jssj = new Date();}if(type == "thisMonth") { //本⽉kssj = getThisMonthFirstDay();//本⽉第⼀天jssj = new Date();}if(type == "thisYear") {kssj = getThisYearFirstDay();//本年第⼀天jssj = new Date();}var dateFrom = kssj.format('yyyy-MM-dd');var dateTo = jssj.format('yyyy-MM-dd');document.getElementById("dateFrom").value=dateFrom;document.getElementById("dateTo").value=dateTo;}function getThisWeekFirstDay() {var now = new Date();var day = now.getDay();var week = "1234567";var first = 0 - week.indexOf(day);var thisWeekfirstDay = new Date;thisWeekfirstDay.setDate (thisWeekfirstDay.getDate () + first); return thisWeekfirstDay;}function getThisMonthFirstDay(){var date=new Date();date.setDate(1);return date;}function getThisYearFirstDay() {var currentDate=new Date();var currentYear=currentDate.getFullYear();var currentYearFirstDate=new Date(currentYear,0,1);return currentYearFirstDate;}//data类型转stringDate.prototype.format = function(format){var o = {"M+" : this.getMonth()+1, //month"d+" : this.getDate(), //day"h+" : this.getHours(), //hour"m+" : this.getMinutes(), //minute"s+" : this.getSeconds(), //second"q+" : Math.floor((this.getMonth()+3)/3), //quarter"S" : this.getMilliseconds() //millisecond}if(/(y+)/.test(format)) format=format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); for(var k in o)if(new RegExp("("+ k +")").test(format)) format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] :("00"+ o[k]).substr((""+ o[k]).length));return format;}</script></body></html>这样基本上就解决问题了。
MYSQL获取当前年、季、月、周第一天、最后一天的日期时间戳

MYSQL获取当前年、季、⽉、周第⼀天、最后⼀天的⽇期时间戳 因为做⼀些商场某个会员今年的消费分析,所以对sql中时间的获取进⾏了判断。
例如获取今年(即当前年的第⼀天到昨天0时之间)的消费总额。
如果需要时间戳转换,⽤UNIX_TIMESTAMP()函数。
⼀、下⾯是⼀些mysql的时间获取语句:#当年第⼀天:SELECT DATE_SUB(CURDATE(),INTERVAL dayofyear(now())-1DAY);#当年最后⼀天:SELECT concat(YEAR(now()),'-12-31');#当前week的第⼀天:select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) +1DAY);#当前week的最后⼀天:select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) -5DAY);#前⼀week的第⼀天:select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) +8DAY);#前⼀week的最后⼀天:select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) +2DAY);#前两week的第⼀天:select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) +15DAY);#前两week的最后⼀天:select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) +9DAY);#当前month的第⼀天:SELECT concat(date_format(LAST_DAY(now()),'%Y-%m-'),'01');#当前month的最后⼀天:SELECT LAST_DAY(now());#前⼀month的第⼀天:SELECT concat(date_format(LAST_DAY(now() - interval 1month),'%Y-%m-'),'01');#前⼀month的最后⼀天:SELECT LAST_DAY(now() - interval 1month);#前两month的第⼀天:SELECT concat(date_format(LAST_DAY(now() - interval 2month),'%Y-%m-'),'01');#前两month的最后⼀天:SELECT LAST_DAY(now() - interval 2month);#当前quarter的第⼀天:select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-3month),'%Y-%m-'),'01');#当前quarter的最后⼀天:select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-1month);#前⼀quarter的第⼀天:select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-6month),'%Y-%m-'),'01');#前⼀quarter的最后⼀天:select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-4month);#前两quarter的第⼀天:select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-9month),'%Y-%m-'),'01');#前两quarter的最后⼀天:select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-7month);⼆、举⼏个某会员的消费分析的sql语句:-- 今年的消费总额SELECT IFNULL(SUM(a.trade_amount)/100,0)FROM mob_checkout_counter.checkout_record a -- 消费记录表WHERE card_code ='某会员的标识'AND checkout_status = ‘消费状态’AND trade_time >= UNIX_TIMESTAMP(DATE_SUB(CURDATE(),INTERVAL dayofyear(now())-1DAY)) -- 当前年的第⼀天的时间戳AND trade_time <= UNIX_TIMESTAMP(CAST(SYSDATE()AS DATE) - INTERVAL 1DAY) -- 昨天的0时的时间戳-- 今年的消费笔数SELECT COUNT(*)FROM mob_checkout_counter.checkout_record aWHERE card_code ='2396998881100009965'AND checkout_status =1AND trade_time >= UNIX_TIMESTAMP(DATE_SUB(CURDATE(),INTERVAL dayofyear(now())-1DAY))AND trade_time <= UNIX_TIMESTAMP(CAST(SYSDATE()AS DATE) - INTERVAL 1DAY)-- 今年的客单价SELECT IFNULL(SUM(a.trade_amount)/100,0)/COUNT(*)FROM mob_checkout_counter.checkout_record aWHERE card_code ='2396998881100009965'AND checkout_status =1AND trade_time >= UNIX_TIMESTAMP(DATE_SUB(CURDATE(),INTERVAL dayofyear(now())-1DAY))AND trade_time <= UNIX_TIMESTAMP(CAST(SYSDATE()AS DATE) - INTERVAL 1DAY)。
sql语句获取今天、昨天、近7天、本周、上周、本月、上月、半年数据

sql语句获取今天、昨天、近7天、本周、上周、本⽉、上⽉、半年数据01话说有⼀⽂章表article,存储⽂章的添加⽂章的时间是add_time字段,该字段为int(5)类型的,现需要查询今天添加的⽂章总数并且按照时间从⼤到⼩排序,则查询语句如下:02031select * from `article` where date_format(from_UNIXTIME(`add_time`),'%Y-%m-%d') = date_format(now(),'%Y-%m-%d');04或者:05061select * from `article` where to_days(date_format(from_UNIXTIME(`add_time`),'%Y-%m-%d')) = to_days(now());07假设以上表的add_time字段的存储类型是DATETIME类型或者TIMESTAMP类型,则查询语句也可按如下写法:0809查询今天的信息记录:10111select * from `article` where to_days(`add_time`) = to_days(now());12查询昨天的信息记录:13141select * from `article` where to_days(now()) – to_days(`add_time`) <= 1;15查询近7天的信息记录:16171select * from `article` where date_sub(curdate(), INTERVAL 7 DAY) <= date(`add_time`);18查询近30天的信息记录:19201select * from `article` where date_sub(curdate(), INTERVAL 30 DAY) <= date(`add_time`);21查询本⽉的信息记录:22231select * from `article` where date_format(`add_time`, ‘%Y%m') = date_format(curdate() , ‘%Y%m');24查询上⼀⽉的信息记录:25261select * from `article` where period_diff(date_format(now() , ‘%Y%m') , date_format(`add_time`, ‘%Y%m')) =1;27对上⾯的SQL语句中的⼏个函数做⼀下分析:2829(1)to_days3031就像它的名字⼀样,它是将具体的某⼀个⽇期或时间字符串转换到某⼀天所对应的unix时间戳,如:323301 mysql> select to_days('2010-11-22 14:39:51');3402 +--------------------------------+3503 | to_days('2010-11-22 14:39:51') |3604 +--------------------------------+3705 | 734463 |3806 +--------------------------------+39074008 mysql> select to_days('2010-11-23 14:39:51');4109 +--------------------------------+4210 | to_days('2010-11-23 14:39:51') |4311 +--------------------------------+4412 | 734464 |4513 +--------------------------------+46可以看出22⽇与23⽇的差别就是,转换之后的数增加了1,这个粒度的查询是⽐较粗糙的,有时可能不能满⾜我们的查询要求,那么就需要使⽤细粒度的查询⽅法str_to_date函数了,下⾯将分析这个函数的⽤法。
时间戳生成的方法

时间戳生成的方法一、时间戳是什么?1.1 时间戳啊,简单来说就是一个能表示某个特定时刻的标记。
就像我们生活里给某个重要事件打个标记一样,在计算机的世界里,时间戳就是标记某个瞬间的数字。
它精确到啥程度呢?可以精确到毫秒甚至更小的单位呢。
比如说,你在网上下单买东西,系统就会记录下这个下单动作发生的准确时间,这个时间就是以时间戳的形式存在的。
1.2 这时间戳可重要啦,它就像一个时间的证人。
在很多数据处理、网络通信的场景里,没有它可不行。
它能让我们清楚地知道事情发生的先后顺序,就像排队的时候,谁先谁后一目了然。
二、时间戳生成的常见方法。
2.1 系统时钟法。
- 这是最基本的一种方法。
计算机系统本身有个时钟,这个时钟一直在滴答滴答地走。
当需要生成时间戳的时候,就直接从这个系统时钟里读取当前的时间信息。
就好比我们看墙上的时钟来确定现在是什么时候一样。
不过呢,这种方法也有点小问题。
要是系统时钟不准了,那生成的时间戳可就有偏差了。
就像你戴了个走得不准的表,看时间肯定会出错。
2.2 网络时间协议(NTP)法。
- 这是个比较靠谱的方法。
很多设备会通过网络时间协议来同步时间。
就像大家都听一个标准的报时钟一样。
设备会连接到专门的时间服务器,从那里获取准确的时间信息,然后生成时间戳。
这样一来,即使本地系统时钟有点小毛病,也能得到比较准确的时间戳。
这就好比大家都按照电视台的标准时间来对表,不容易出错。
2.3 特定算法生成法。
- 有些时候,为了满足特殊的需求,会用特定的算法来生成时间戳。
比如说在一些加密场景下,会把当前时间和一些密钥之类的东西通过算法混合起来,生成一个独特的时间戳。
这就像是给时间戳穿上了一件加密的外衣,只有知道算法和相关密钥的才能解读它。
这种方法虽然复杂一点,但安全性很高,就像给宝贝上了一把牢固的锁。
三、时间戳生成的注意事项。
3.1 准确性。
- 生成时间戳的时候,准确性那是首要的。
要是时间戳不准,就像盖房子地基没打好一样。
如何获取本周本月本日的开始时间和结束时间的时间戳

如何获取本周本月本日的开始时间和结束时间的时间戳要获取本周、本月和本日的开始时间和结束时间的时间戳,可以使用编程语言中的日期和时间函数来实现。
以下是一种常见的方法来获取这些时间戳的示例(使用Python语言):
获取本周的开始时间和结束时间的时间戳:
```
```
获取本月的开始时间和结束时间的时间戳:
```
start_of_month = today.replace(day=1)
end_of_month =
start_of_month.replace(day=calendar.monthrange(start_of_month.ye ar, start_of_month.month)[1])
```
获取本日的开始时间和结束时间的时间戳:
```
```
请注意,这些示例中使用的是当前本地时间。
如果需要处理不同时区的时间,你可能需要使用额外的函数来设置或转换时区。
具体的方法可能因不同的编程语言和库而有所差异。
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获取本日,本周,本月的开始时间戳和结束时间戳
这是我最近尝试写的一个程序,可能有许多不足之处,还请见谅。
这是一个类,类里面主要有两个方法。
一个是timeToTimestamp (),一个是getTime()。
前者负责将时间转化成时间戳,后者则负责判断filter值,然后设置相应的date时间。
注:filter=1 代表本日,filter=2 代表本周,filter=3代表本月。
class TimestampUtils{
private static long startTime = -1;
private static long endTime = -1;
public static void getTime (int filter){
Calendar cal =Calendar.getInstance();
SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd" ); //设置星期一为一周的开始日
cal.setFirstDayOfWeek(Calendar.MONDAY);
switch(filter){
case 1://今天
startTime = timeToTimestamp(format.format(new Date())+" 00:00: 00");
endTime = timeToTimestamp(format.format(new Date())+" 23:59: 59");
break;
case 2://本周
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
startTime = timeToTimestamp(format.format(cal.getTime())+" 00:0 0:00");
cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
endTime = timeToTimestamp(format.format(cal.getTime())+" 23:5 9:59");
break;
case 3://本月
cal.set(Calendar.DATE, cal.getActualMinimum(Calendar.DATE)); startTime = timeToTimestamp(format.format(cal.getTime())+" 00:0 0:00");
cal.set(Calendar.DATE, cal.getActualMaximum(Calendar.DATE)) ;
endTime = timeToTimestamp(format.format(cal.getTime())+" 23:5 9:59");
break;
default:
break;
}
}
//将时间转换成时间戳
public static long timeToTimestamp (String dateTime){
SimpleDateFormat format2 = new SimpleDateFormat( "yyyy-MM-d d HH:mm:ss" );
long time = -1;
try {
time = format2.parse(dateTime).getTime();
} catch (ParseException e) {
printStackTrace();
}
return time;
}
}。