Javascript dateutil. js

 // Confirm <br/> // determine a leap year <br/> // ----------------------------------------------------- <br/> date. prototype. isleapyear = function () <br/>{< br/> return (0 = This. getyear () % 4 & (this. get year () % 100! = 0) | (this. getyear () % 400 = 0 ))); <br/>}< br/> // --------------------------------------------------- <br/> // format <br/> // yyyy/YYYY/yy indicates the year <br/> // mm/M month <br/> // w/w week <br/> // DD/D/d date <br/> // hh/ h/h time <br/> // mm/M minutes <br/> // SS/S seconds <br/> // ------------------------------------------------------- <br/> date. prototype. format = function (formatstr) <br/>{< br/> var STR = formatstr; <br/> VaR week = ['day', 'yi', '2', '3', '4', '5', '6']; </P> <p> STR = Str. replace (/YYYY | yyyy/, this. getfullyear (); <br/> STR = Str. replace (/yy | YY/, (this. getyear () % 100)> 9? (This. getyear () % 100 ). tostring (): '0' + (this. getyear () % 100); </P> <p> STR = Str. replace (/MM/, this. getmonth ()> 9? This. getmonth (). tostring (): '0' + this. getmonth (); <br/> STR = Str. replace (/M/G, this. getmonth (); </P> <p> STR = Str. replace (/w | w/g, week [this. getday ()]); </P> <p> STR = Str. replace (/DD | DD/, this. getdate ()> 9? This. getdate (). tostring (): '0' + this. getdate (); <br/> STR = Str. replace (/d | D/g, this. getdate (); </P> <p> STR = Str. replace (/HH | hh/, this. gethours ()> 9? This. gethours (). tostring (): '0' + this. gethours (); <br/> STR = Str. replace (/h | h/g, this. gethours (); <br/> STR = Str. replace (/MM/, this. getminutes ()> 9? This. getminutes (). tostring (): '0' + this. getminutes (); <br/> STR = Str. replace (/M/G, this. getminutes (); </P> <p> STR = Str. replace (/SS | SS/, this. getseconds ()> 9? This. getseconds (). tostring (): '0' + this. getseconds (); <br/> STR = Str. replace (/S | S/g, this. getseconds (); </P> <p> return STR; <br/>}</P> <p> // + --------------------------------------------------- <br/> // | returns the format of the day difference between two time periods: yyyy-mm-DD <br/> // + --------------------------------------------------- <br/> function daysbetween (dateone, datetwo) <br/>{< br/> var onemonth = dateone. substring (5, dateone. lastindexof ('-'); <Br/> var oneday = dateone. substring (dateone. length, dateone. lastindexof ('-') + 1); <br/> var oneyear = dateone. substring (0, dateone. indexof ('-'); </P> <p> var twomonth = datetwo. substring (5, datetwo. lastindexof ('-'); <br/> var twoday = datetwo. substring (datetwo. length, datetwo. lastindexof ('-') + 1); <br/> var twoyear = datetwo. substring (0, datetwo. indexof ('-'); </P> <p> var CHA = (date. parse (o Nemonth + '/' + oneday + '/' + oneyear)-date. parse (twomonth + '/' + twoday + '/' + twoyear)/86400000); <br/> return math. ABS (CHA ); <br/>}</P> <p> // + date <br/> // | date calculation <br/> // + ----------------------------------------------------- <br/> date. prototype. dateadd = function (strinterval, number) {<br/> var dttmp = This; <br/> switch (strinterval) {<br/> case 's': Return ne W date (date. parse (dttmp) + (1000 * number); <br/> case 'N': return new date (date. parse (dttmp) + (60000 * number); <br/> case 'H': return new date (date. parse (dttmp) + (3600000 * number); <br/> case 'D': return new date (date. parse (dttmp) + (86400000 * number); <br/> case 'W': return new date (date. parse (dttmp) + (86400000*7) * number); <br/> case 'q': return new date (dttmp. getfullyear (), (DTT MP. getmonth () + number * 3, dttmp. getdate (), dttmp. gethours (), dttmp. getminutes (), dttmp. getseconds (); <br/> case 'M': return new date (dttmp. getfullyear (), (dttmp. getmonth () + number, dttmp. getdate (), dttmp. gethours (), dttmp. getminutes (), dttmp. getseconds (); <br/> case 'y': return new date (dttmp. getfullyear () + number), dttmp. getmonth (), dttmp. getdate (), dttmp. gethours (), dttmp. getminutes (), DT TMP. getseconds ()); <br/>}</P> <p> // + --------------------------------------------------- <br/> // | compare the dtend format with the date type or valid date format string <br/> // + ----------------------------------------------------- <br/> date. prototype. datediff = function (strinterval, dtend) {<br/> var dtstart = This; <br/> If (typeof dtend = 'string ') // If the string is converted to the date type <br/>{< br/> dtend = stringtodate (dtend); <br/>}< br/> switch (Strinterval) {<br/> case 's': Return parseint (dtend-dtstart)/1000); <br/> case 'N ': return parseint (dtend-dtstart)/60000); <br/> case 'H': Return parseint (dtend-dtstart)/3600000 ); <br/> case 'D': Return parseint (dtend-dtstart)/86400000); <br/> case 'W': Return parseint (dtend-dtstart) /(86400000*7); <br/> case 'M': Return (dtend. getmonth () + 1) + (dtend. getfullyear ()-dtstar T. getfullyear () * 12)-(dtstart. getmonth () + 1); <br/> case 'y': Return dtend. getfullyear ()-dtstart. getfullyear (); <br/>}</P> <p> // + ----------------------------------------------- <br/> // | date output string, the system's tostring method is reloaded <br/> // + ------------------------------------------------- <br/> date. prototype. tostring = function (showweek) <br/>{< br/> var mydate = This; <br/> var STR = mydate. tolocaleda Testring (); <br/> If (showweek) <br/> {<br/> var week = ['day', 'yi', '2 ', '3', '4', '5', '6']; <br/> STR + = 'Week' + week [mydate. getday ()]; <br/>}< br/> return STR; <br/>}</P> <p> // + --------------------------------------------------- <br/> // | date validity verification <br/> // | format: YYYY-MM-DD or yyyy/mm/DD <br/> // + --------------------------------------------------- <br/> function isvaliddate (datestr) <br/> {<br/> var sdate = dat Estr. replace (/(^/S + |/S + $)/g, ''); // remove spaces on both sides; <br/> If (sdate = '') return true; <br/> // if the format is yyyy-(/) Mm-(/) dd Or yyyy-(/) m -(/) DD, yyyy-(/) m-(/) D, or yyyy-(/) Mm-(/) D is replaced with ''<br/> // database, valid date can be: YYYY-MM/DD (2003-3/21), the database is automatically converted to YYYY-MM-DD format <br/> var S = sdate. replace (/[/d] {4, 4} [/-/] {1} [/d] {1} [/-/] {1} [/d] {1, 2} /g, ''); <br/> If (S = '') // The description format meets the YYYY-MM-DD or YYYY-M-DD or YYYY-M-D or YYYY-MM-D <br/> {<br/> var T = N EW date (sdate. replace (//-/g, '/'); <br/> var AR = sdate. split (/[-/:]/); <br/> If (AR [0]! = T. getyear () | ar [1]! = T. getmonth () + 1 | ar [2]! = T. getdate () <br/>{< br/> // alert ('incorrect Date Format! Format: YYYY-MM-DD or yyyy/mm/DD. Pay attention to the leap year. '); <Br/> return false; <br/>}< br/> else <br/> {<br/> // alert ('incorrect Date Format! Format: YYYY-MM-DD or yyyy/mm/DD. Pay attention to the leap year. '); <Br/> return false; <br/>}< br/> return true; <br/>}</P> <p> // + --------------------------------------------------- <br/> // | Date and Time check <br/> // | format: YYYY-MM-DD hh: MM: SS <br/> // + --------------------------------------------------- <br/> function checkdatetime (STR) <br/>{< br/> var Reg =/^ (/d +) -(/d {}) :(/d {}) $ /; <br/> var r = Str. match (REG); <br/> If (r = NUL L) return false; <br/> r [2] = R [2]-1; <br/> var d = new date (R [1], R [2], R [3], R [4], R [5], R [6]); <br/> If (D. getfullyear ()! = R [1]) return false; <br/> If (D. getmonth ()! = R [2]) return false; <br/> If (D. getdate ()! = R [3]) return false; <br/> If (D. gethours ()! = R [4]) return false; <br/> If (D. getminutes ()! = R [5]) return false; <br/> If (D. getseconds ()! = R [6]) return false; <br/> return true; <br/>}</P> <p> // + date <br/> // | Splits a date into an array. <br/> // + ----------------------------------------------------- <br/> date. prototype. toarray = function () <br/>{< br/> var mydate = This; <br/> var myarray = array (); <br/> myarray [0] = mydate. getfullyear (); <br/> myarray [1] = mydate. getmonth (); <br/> myarray [2] = mydate. getdate (); <Br/> myarray [3] = mydate. gethours (); <br/> myarray [4] = mydate. getminutes (); <br/> myarray [5] = mydate. getseconds (); <br/> return myarray; <br/>}</P> <p> // + --------------------------------------------------- <br/> // | obtain date data information <br/> // | interval indicates data type <br/> // | y, M, D, W, week WW, week h, n minutes, S <br/> // + ----------------------------------------------- <br/> date. prototype. datepart = function (interv Al) <br/>{< br/> var mydate = This; <br/> var partstr = ''; <br/> var week = ['day ', '1', '2', '3', '4', '5', '6']; <br/> switch (interval) <br/>{< br/> case 'y': partstr = mydate. getfullyear (); break; <br/> case 'M': partstr = mydate. getmonth () + 1; break; <br/> case 'D': partstr = mydate. getdate (); break; <br/> case 'W': partstr = week [mydate. getday ()]; break; <br/> case 'ww ': partstr = mydate. weeknumofyear (); Break; <br/> case 'H': partstr = mydate. gethours (); break; <br/> case 'N': partstr = mydate. getminutes (); break; <br/> case's ': partstr = mydate. getseconds (); break; <br/>}< br/> return partstr; <br/>}</P> <p> // + --------------------------------------------------- <br/> // | obtains the maximum number of days of the current month. <br/> // + hour <br/> date. prototype. maxdayofdate = function () <br/> {<B R/> var mydate = This; <br/> var ary = mydate. toarray (); <br/> var date1 = (new date (ary [0], Ary [1] + 1,1); <br/> var date2 = date1.dateadd (1, 'M', 1); <br/> var result = datediff (date1.format ('yyyy-mm-dd'), date2.format ('yyyy-mm-dd ')); <br/> return result; <br/>}</P> <p> // + ------------------------------------------------- <br/> // | the week in which the current date is obtained is the week in the year. <br/> // + ------------------------------------------- -------- <Br/> date. prototype. weeknumofyear = function () <br/>{< br/> var mydate = This; <br/> var ary = mydate. toarray (); <br/> var year = ary [0]; <br/> var month = ary [1] + 1; <br/> var day = ary [2]; <br/> document. write ('<script language = VBScript/>/N'); <br/> document. write ('mydate = datevalue ("" + month + "-" + day + "-" + year + "")/N'); <br/> document. write ('result = datepart ("ww", mydate)/N'); <br/> d Ocument. write ('/N'); <br/> return result; <br/>}</P> <p> // + --------------------------------------------------- <br/> // | convert string to date type <br/> // | format: mm/DD/YYYY mm-dd-yyyy/mm/DD yyyy-mm-DD <br/> // + --------------------------------------------------- <br/> function stringtodate (datestr) <br/>{</P> <p> var converted = date. parse (datestr); <br/> var mydate = new date (converted); <br/> If (isnan (mydate) <B R/>{< br/> // var delimcahar = datestr. indexof ('/')! =-1? '/': '-'; <Br/> var arys = datestr. split ('-'); <br/> mydate = new date (arys [0], -- arys [1], arys [2]); <br/>}< br/> return mydate; <br/>}< br/> document. write (new date ()). datepart ('H '));