Javascript 日期解析/检查函数

DEFAULT_DATE_RULE = {r:/^(/d{4})//(/d{2})//(/d{2})$/, y:1, m:2, d:3};function checkDateValueA(val, checkList, begin, end, format, checkBlank) { if (val == null ||val == "" ) return !checkBlank; //judge format of value var dateVal = _parseDate(val, format); var dateBegin = null; var dateEnd = null; if(!dateVal) return false; if (checkList == null || checkList.length == 0) return true; var nVal = Date.parse(dateVal); var KW_BEGIN = "begin";var KW_END = "end"; if( checkList.length == 2) { dateBegin = _parseDate(begin, format); dateEnd = _parseDate(end, format);if(!dateBegin || !dateEnd) return false;if ((nVal < Date.parse(dateBegin)) || (nVal > Date.parse(dateEnd))) return false;} else {if( checkList[0] == KW_BEGIN) { dateBegin = _parseDate(begin, format);if(!dateBegin) return false;if(nVal < Date.parse(dateBegin)) return false;} else if( checkList[0] == KW_END){ dateEnd = _parseDate(end, format);if(!dateEnd) return false;if(nVal > Date.parse(dateEnd)) return false;}}return true;}function checkDateFormatA(val, format, checkBlank) {if (val == ""||val == null) return !checkBlank;return (_parseDate(val, format) != null);}function _getDateRule(format){if(!format || format == "") return DEFAULT_DATE_RULE;var retVal = {};var rSet = {"YYYY":["y","(//d{4})"],"YY":["y","(//d{2})"],"MM":["m","(//d{2})"],"DD":["d","(//d{2})"]};var rStr = "";for(k in rSet){rStr = (rStr == "")? k : rStr + "|" + k;}var m = format.match(new RegExp(rStr, "g"));if(!(m instanceof Array) || (m.length != 3)) return null;if(format.replace(new RegExp(rStr, "g"), "").match(//w/)) return null;for(i=0; i<m.length; i++){retVal[rSet[m[i]][0]] = i+1;}if(!retVal.y || !retVal.m || !retVal.d) return null;rStr = format;for(k in rSet){rStr = rStr.replace(new RegExp(k),rSet[k][1]);}retVal.r = new RegExp("^" + rStr + "$");return retVal;}function _validateDate( y, m, d ) {var rule = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];if (d < 1) return false;if (m == 2) {if ((( y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0)) {if (d > 29) return false;} else {if (d > 28) return false;}} else if (!rule[m-1] || d > rule[m-1]) return false;return true;}function _convertYear(y){var nY = y * 1;if(nY < 100){return ( nY>69 ? "19" : "20") + y;}return y;}function _parseDate(val, format){if(val == null) return null;var rule = _getDateRule(format);if(!rule) return null;var m = val.match(rule.r);if(!m) return null;var nY = _convertYear(m[rule.y]) * 1;var nM = m[rule.m] * 1;var nD = m[rule.d] * 1;if(_validateDate(nY, nM, nD)){return (new Date(nY, nM-1, nD));}return null;}