The way JavaScript converts dates to strings by date-mask

This example describes how JavaScript translates dates into strings by date-mask. Share to everyone for your reference. The implementation methods are as follows:

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var monthnames = ["January", "February", "March", "April", "may", "June", "July", "August", "September", "October", "Nove Mber "," December "]; var daynames = ["Sunday", "Monday", "Tueday", "Wednesday", "Thursday", "Friday", "Saturday"]; var shortmths = ["No More", "Feb", "Mar", "APR", "may", "June", "O", "Aug", "Sep", "Oct", "Nov", "Dec"]; var shortdays = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]; var stringtodate = function (Sdate, Sformat, cutOff) {//Input:a date value as a string, it ' s format as a string e.g. ' d D-mmm-yy '//optional:a cutoff (integer) for 2 digit years. If no ' d ' appears in the format string then the 1st of the month is assumed. If the cut-off is then the value would be converted//to 2020; If the then this would be converted to 1940. If no cut-off is supplied then ' would be pre-pended to the year (YY). Output:a string in the format ' yyyy/mm/dd ' or '/won't be attempt to convert certain combinations e.g. DMM, MDD, DDM, Yyyyd. var sparsed, Fndsingle; Sparsed would be constructed in the format ' yyyy/mm/dd ' sdate = sdate.tostring (). toUpperCase (); Sformat = Sformat.touppercase (); if (Sformat.search (/mmmm| mmm/) + 1) {//replace mar/march with, etc. sdate = sdate.replace (new RegExp (' + shortmths.join (' | ') + ') [a-z]* ', ' g I '), function (m) {var i = shortmths.indexof (M.charat (0). toUpperCase () + M.SUBSTR (1, 2). toLowerCase ()) + 1; return ((I &L T 10)? "0" + I: "" + i). toString (); Sformat = Sformat.replace (/mmmm| mmm/g, ' MM '); } if (Sformat.search (/dddd| ddd/) + 1) {//replace Tue/tuesday, etc. with ' Sdate = Sdate.replace (new RegExp (' + shortdays.join (' | ') + ') [a-z]* ', ' GI '), '); Sformat = Sformat.replace (/dddd| Ddd/g, ""); } sdate = Sdate.replace (/(^| d) (d) (=d|$)/g, function ($, $, $) {//single digits 2 with 0 ' + $}); Sformat = Sformat.replace (/(^|[ ^dmy]) (d| M) (=[^dmy]|$)/g, function ($, $) {return $ + $ + $//replace D or M with DD and MM}); ARe there still single Ds or Ms? Fndsingle = Sformat.search (/(^|[ ^D]) D ([^d]|$) | (^| [^m]) M ([^m]|$)/) +1; Don't attempt to parse, for example, ' DMM ' if (fndsingle) return '; Sformat = Sformat.replace (/(^|[ ^y]) (YY) (? =[^y]|$)/g, function ($, $, index) {var tempdate = sdate.substr (0, index + 1); tempdate = = (CUTOFF)? ((parseint (SDATE.SUBSTR (index + 1, 2), ten) > CutOff)? ' 19 ': ' 20 '): ' 20 '; Tempdate + = SDATE.SUBSTR (index + 1); Sdate = tempdate; Return $ + $ + $; }); sparsed = (' Yyyy/mm/dd '). Replace (/yyyy| mm| dd/g, function (m) {return (Sformat.indexof (m) + 1)? Sdate.substr (Sformat.indexof (M), m.length): ";}"; if (Sparsed.charat (0) = = '/') {//If no specified, assume the current year sparsed = (new Date (). getFullYear ()) + SP arsed; } if (Sparsed.charat (sparsed.length-1) = = '/') {//If no date, assume the 1st of month sparsed + + ';}//should End up with characters ... return (Sparsed.length = 10)? sparsed: '; };

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