JS常用日期操作

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$.extend(Date.prototype, {
    format: function(b) {
        if (Date.formatFunctions[b] == null) {
            Date.createNewFormat(b)
        }
        var a = Date.formatFunctions[b];
        return this[a]()
    },
    getTimezone: function() {
        return this.toString().replace(/^.* (?:\((.*)\)|([A-Z]{1,4})(?:[\-+][0-9]{4})?(?: -?\d+)?)$/, "$1$2").replace(/[^A-Z]/g, "")
    },
    getGMTOffset: function(a) {
        return (this.getTimezoneOffset() > 0 ? "-" : "+") + String.leftPad(Math.abs(Math.floor(this.getTimezoneOffset() / 60)), 2, "0") + (a ? ":" : "") + String.leftPad(this.getTimezoneOffset() % 60, 2, "0")
    },
    getDayOfYear: function() {
        var a = 0;
        Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
        for (var b = 0; b < this.getMonth(); ++b) {
            a += Date.daysInMonth[b]
        }
        return a + this.getDate() - 1
    },
    getWeekOfYear: function() {
        var b = 86400000;
        var c = 7 * b;
        var d = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate() + 3) / b;
        var a = Math.floor(d / 7);
        var e = new Date(a * c).getUTCFullYear();
        return a - Math.floor(Date.UTC(e, 0, 7) / c) + 1
    },
    isLeapYear: function() {
        var a = this.getFullYear();
        return ((a & 3) == 0 && (a % 100 || (a % 400 == 0 && a)))
    },
    getFirstDayOfMonth: function() {
        var a = (this.getDay() - (this.getDate() - 1)) % 7;
        return (a < 0) ? (a + 7) : a
    },
    getLastDayOfMonth: function() {
        var a = (this.getDay() + (Date.daysInMonth[this.getMonth()] - this.getDate())) % 7;
        return (a < 0) ? (a + 7) : a
    },
    getFirstDateOfMonth: function() {
        return new Date(this.getFullYear(),this.getMonth(),1)
    },
    getLastDateOfMonth: function() {
        return new Date(this.getFullYear(),this.getMonth(),this.getDaysInMonth())
    },
    getDaysInMonth: function() {
        Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
        return Date.daysInMonth[this.getMonth()]
    },
    getSuffix: function() {
        switch (this.getDate()) {
        case 1:
        case 21:
        case 31:
            return "st";
        case 2:
        case 22:
            return "nd";
        case 3:
        case 23:
            return "rd";
        default:
            return "th"
        }
    },
    clone: function() {
        return new Date(this.getTime())
    },
    clearTime: function(a) {
        if (a) {
            return this.clone().clearTime()
        }
        this.setHours(0);
        this.setMinutes(0);
        this.setSeconds(0);
        this.setMilliseconds(0);
        return this
    },
    add: function(b, c) {
        var e = this.clone();
        if (!b || c === 0) {
            return e
        }
        switch (b.toLowerCase()) {
        case Date.MILLI:
            e.setMilliseconds(this.getMilliseconds() + c);
            break;
        case Date.SECOND:
            e.setSeconds(this.getSeconds() + c);
            break;
        case Date.MINUTE:
            e.setMinutes(this.getMinutes() + c);
            break;
        case Date.HOUR:
            e.setHours(this.getHours() + c);
            break;
        case Date.DAY:
            e.setDate(this.getDate() + c);
            break;
        case Date.MONTH:
            var a = this.getDate();
            if (a > 28) {
                a = Math.min(a, this.getFirstDateOfMonth().add("mo", c).getLastDateOfMonth().getDate())
            }
            e.setDate(a);
            e.setMonth(this.getMonth() + c);
            break;
        case Date.YEAR:
            e.setFullYear(this.getFullYear() + c);
            break
        }
        return e
    },
    between: function(c, a) {
        var b = this.getTime();
        return c.getTime() <= b && b <= a.getTime()
    }
});
(function() {
    Date.patterns = {
        ISO8601Long: "Y-m-d H:i:s",
        ISO8601Short: "Y-m-d",
        ShortDate: "n/j/Y",
        LongDate: "l, F d, Y",
        FullDateTime: "l, F d, Y g:i:s A",
        MonthDay: "F d",
        ShortTime: "g:i A",
        LongTime: "g:i:s A",
        SortableDateTime: "Y-m-d\\TH:i:s",
        UniversalSortableDateTime: "Y-m-d H:i:sO",
        YearMonth: "F, Y"
    };
    Date.parseFunctions = {
        count: 0
    };
    Date.parseRegexes = [];
    Date.formatFunctions = {
        count: 0
    };
    Date.daysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    Date.monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
    Date.getShortMonthName = function(month) {
        return Date.monthNames[month].substring(0, 3)
    }
    ;
    Date.dayNames = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
    Date.getShortDayName = function(day) {
        return Date.dayNames[day].substring(0, 3)
    }
    ;
    Date.y2kYear = 50;
    Date.monthNumbers = {
        Jan: 0,
        Feb: 1,
        Mar: 2,
        Apr: 3,
        May: 4,
        Jun: 5,
        Jul: 6,
        Aug: 7,
        Sep: 8,
        Oct: 9,
        Nov: 10,
        Dec: 11
    };
    Date.MILLI = "ms";
    Date.SECOND = "s";
    Date.MINUTE = "mi";
    Date.HOUR = "h";
    Date.DAY = "d";
    Date.MONTH = "mo";
    Date.YEAR = "y";
    Date.getMonthNumber = function(name) {
        return Date.monthNumbers[name.substring(0, 1).toUpperCase() + name.substring(1, 3).toLowerCase()]
    }
    ;
    Date.parseDate = function(input, format) {
        if (Date.parseFunctions[format] == null) {
            Date.createParser(format)
        }
        var func = Date.parseFunctions[format];
        return Date[func](input)
    }
    ;
    Date.createNewFormat = function(format) {
        var funcName = "format" + Date.formatFunctions.count++;
        Date.formatFunctions[format] = funcName;
        var code = "Date.prototype." + funcName + " = function(){return ";
        var special = false;
        var ch = "";
        for (var i = 0; i < format.length; ++i) {
            ch = format.charAt(i);
            if (!special && ch == "\\") {
                special = true
            } else {
                if (special) {
                    special = false;
                    code += "'" + String.escape(ch) + "' + "
                } else {
                    code += Date.getFormatCode(ch)
                }
            }
        }
        eval(code.substring(0, code.length - 3) + ";}")
    }
    ;
    Date.getFormatCode = function(character) {
        switch (character) {
        case "d":
            return "String.leftPad(this.getDate(), 2, '0') + ";
        case "D":
            return "Date.getShortDayName(this.getDay()) + ";
        case "j":
            return "this.getDate() + ";
        case "l":
            return "Date.dayNames[this.getDay()] + ";
        case "N":
            return "(this.getDay() ? this.getDay() : 7) + ";
        case "S":
            return "this.getSuffix() + ";
        case "w":
            return "this.getDay() + ";
        case "z":
            return "this.getDayOfYear() + ";
        case "W":
            return "String.leftPad(this.getWeekOfYear(), 2, '0') + ";
        case "F":
            return "Date.monthNames[this.getMonth()] + ";
        case "m":
            return "String.leftPad(this.getMonth() + 1, 2, '0') + ";
        case "M":
            return "Date.getShortMonthName(this.getMonth()) + ";
        case "n":
            return "(this.getMonth() + 1) + ";
        case "t":
            return "this.getDaysInMonth() + ";
        case "L":
            return "(this.isLeapYear() ? 1 : 0) + ";
        case "o":
            return "(this.getFullYear() + (this.getWeekOfYear() == 1 && this.getMonth() > 0 ? +1 : (this.getWeekOfYear() >= 52 && this.getMonth() < 11 ? -1 : 0))) + ";
        case "Y":
            return "this.getFullYear() + ";
        case "y":
            return "('' + this.getFullYear()).substring(2, 4) + ";
        case "a":
            return "(this.getHours() < 12 ? 'am' : 'pm') + ";
        case "A":
            return "(this.getHours() < 12 ? 'AM' : 'PM') + ";
        case "g":
            return "((this.getHours() % 12) ? this.getHours() % 12 : 12) + ";
        case "G":
            return "this.getHours() + ";
        case "h":
            return "String.leftPad((this.getHours() % 12) ? this.getHours() % 12 : 12, 2, '0') + ";
        case "H":
            return "String.leftPad(this.getHours(), 2, '0') + ";
        case "i":
            return "String.leftPad(this.getMinutes(), 2, '0') + ";
        case "s":
            return "String.leftPad(this.getSeconds(), 2, '0') + ";
        case "u":
            return "String.leftPad(this.getMilliseconds(), 3, '0') + ";
        case "O":
            return "this.getGMTOffset() + ";
        case "P":
            return "this.getGMTOffset(true) + ";
        case "T":
            return "this.getTimezone() + ";
        case "Z":
            return "(this.getTimezoneOffset() * -60) + ";
        case "c":
            for (var df = Date.getFormatCode, c = "Y-m-dTH:i:sP", code = "", i = 0, l = c.length; i < l; ++i) {
                var e = c.charAt(i);
                code += e == "T" ? "'T' + " : df(e)
            }
            return code;
        case "U":
            return "Math.round(this.getTime() / 1000) + ";
        default:
            return "'" + String.escape(character) + "' + "
        }
    }
    ;
    Date.createParser = function(format) {
        var funcName = "parse" + Date.parseFunctions.count++;
        var regexNum = Date.parseRegexes.length;
        var currentGroup = 1;
        Date.parseFunctions[format] = funcName;
        var code = "Date." + funcName + " = function(input){\nvar y = -1, m = -1, d = -1, h = -1, i = -1, s = -1, ms = -1, o, z, u, v;\nvar d = new Date();\ny = d.getFullYear();\nm = d.getMonth();\nd = d.getDate();\nvar results = input.match(Date.parseRegexes[" + regexNum + "]);\nif (results && results.length > 0) {";
        var regex = "";
        var special = false;
        var ch = "";
        for (var i = 0; i < format.length; ++i) {
            ch = format.charAt(i);
            if (!special && ch == "\\") {
                special = true
            } else {
                if (special) {
                    special = false;
                    regex += String.escape(ch)
                } else {
                    var obj = Date.formatCodeToRegex(ch, currentGroup);
                    currentGroup += obj.g;
                    regex += obj.s;
                    if (obj.g && obj.c) {
                        code += obj.c
                    }
                }
            }
        }
        code += "if (u)\n{v = new Date(u * 1000);}else if (y >= 0 && m >= 0 && d > 0 && h >= 0 && i >= 0 && s >= 0 && ms >= 0)\n{v = new Date(y, m, d, h, i, s, ms);}\nelse if (y >= 0 && m >= 0 && d > 0 && h >= 0 && i >= 0 && s >= 0)\n{v = new Date(y, m, d, h, i, s);}\nelse if (y >= 0 && m >= 0 && d > 0 && h >= 0 && i >= 0)\n{v = new Date(y, m, d, h, i);}\nelse if (y >= 0 && m >= 0 && d > 0 && h >= 0)\n{v = new Date(y, m, d, h);}\nelse if (y >= 0 && m >= 0 && d > 0)\n{v = new Date(y, m, d);}\nelse if (y >= 0 && m >= 0)\n{v = new Date(y, m);}\nelse if (y >= 0)\n{v = new Date(y);}\n}return (v && (z || o))?\n    (z ? v.add(Date.SECOND, (v.getTimezoneOffset() * 60) + (z*1)) :\n        v.add(Date.HOUR, (v.getGMTOffset() / 100) + (o / -100))) : v\n;}";
        Date.parseRegexes[regexNum] = new RegExp("^" + regex + "$","i");
        eval(code)
    }
    ;
    Date.formatCodeToRegex = function(character, currentGroup) {
        switch (character) {
        case "d":
            return {
                g: 1,
                c: "d = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{2})"
            };
        case "D":
            for (var a = [], i = 0; i < 7; a.push(Date.getShortDayName(i)),
            ++i) {}
            return {
                g: 0,
                c: null,
                s: "(?:" + a.join("|") + ")"
            };
        case "j":
            return {
                g: 1,
                c: "d = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{1,2})"
            };
        case "l":
            return {
                g: 0,
                c: null,
                s: "(?:" + Date.dayNames.join("|") + ")"
            };
        case "N":
            return {
                g: 0,
                c: null,
                s: "[1-7]"
            };
        case "S":
            return {
                g: 0,
                c: null,
                s: "(?:st|nd|rd|th)"
            };
        case "w":
            return {
                g: 0,
                c: null,
                s: "[0-6]"
            };
        case "z":
            return {
                g: 0,
                c: null,
                s: "(?:\\d{1,3}"
            };
        case "W":
            return {
                g: 0,
                c: null,
                s: "(?:\\d{2})"
            };
        case "F":
            return {
                g: 1,
                c: "m = parseInt(Date.getMonthNumber(results[" + currentGroup + "]), 10);\n",
                s: "(" + Date.monthNames.join("|") + ")"
            };
        case "m":
            return {
                g: 1,
                c: "m = parseInt(results[" + currentGroup + "], 10) - 1;\n",
                s: "(\\d{2})"
            };
        case "M":
            for (var a = [], i = 0; i < 12; a.push(Date.getShortMonthName(i)),
            ++i) {}
            return {
                g: 1,
                c: "m = parseInt(Date.getMonthNumber(results[" + currentGroup + "]), 10);\n",
                s: "(" + a.join("|") + ")"
            };
        case "n":
            return {
                g: 1,
                c: "m = parseInt(results[" + currentGroup + "], 10) - 1;\n",
                s: "(\\d{1,2})"
            };
        case "t":
            return {
                g: 0,
                c: null,
                s: "(?:\\d{2})"
            };
        case "L":
            return {
                g: 0,
                c: null,
                s: "(?:1|0)"
            };
        case "o":
        case "Y":
            return {
                g: 1,
                c: "y = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{4})"
            };
        case "y":
            return {
                g: 1,
                c: "var ty = parseInt(results[" + currentGroup + "], 10);\ny = ty > Date.y2kYear ? 1900 + ty : 2000 + ty;\n",
                s: "(\\d{1,2})"
            };
        case "a":
            return {
                g: 1,
                c: "if (results[" + currentGroup + "] == 'am') {\nif (h == 12) { h = 0; }\n} else { if (h < 12) { h += 12; }}",
                s: "(am|pm)"
            };
        case "A":
            return {
                g: 1,
                c: "if (results[" + currentGroup + "] == 'AM') {\nif (h == 12) { h = 0; }\n} else { if (h < 12) { h += 12; }}",
                s: "(AM|PM)"
            };
        case "g":
        case "G":
            return {
                g: 1,
                c: "h = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{1,2})"
            };
        case "h":
        case "H":
            return {
                g: 1,
                c: "h = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{2})"
            };
        case "i":
            return {
                g: 1,
                c: "i = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{2})"
            };
        case "s":
            return {
                g: 1,
                c: "s = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{2})"
            };
        case "u":
            return {
                g: 1,
                c: "ms = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(\\d{3})"
            };
        case "O":
            return {
                g: 1,
                c: ["o = results[", currentGroup, "];\n", "var sn = o.substring(0,1);\n", "var hr = o.substring(1,3)*1 + Math.floor(o.substring(3,5) / 60);\n", "var mn = o.substring(3,5) % 60;\n", "o = ((-12 <= (hr*60 + mn)/60) && ((hr*60 + mn)/60 <= 14))?\n", "    (sn + String.leftPad(hr, 2, 0) + String.leftPad(mn, 2, 0)) : null;\n"].join(""),
                s: "([+-]\\d{4})"
            };
        case "P":
            return {
                g: 1,
                c: ["o = results[", currentGroup, "];\n", "var sn = o.substring(0,1);\n", "var hr = o.substring(1,3)*1 + Math.floor(o.substring(4,6) / 60);\n", "var mn = o.substring(4,6) % 60;\n", "o = ((-12 <= (hr*60 + mn)/60) && ((hr*60 + mn)/60 <= 14))?\n", "    (sn + String.leftPad(hr, 2, 0) + String.leftPad(mn, 2, 0)) : null;\n"].join(""),
                s: "([+-]\\d{2}:\\d{2})"
            };
        case "T":
            return {
                g: 0,
                c: null,
                s: "[A-Z]{1,4}"
            };
        case "Z":
            return {
                g: 1,
                c: "z = results[" + currentGroup + "] * 1;\nz = (-43200 <= z && z <= 50400)? z : null;\n",
                s: "([+-]?\\d{1,5})"
            };
        case "c":
            var df = Date.formatCodeToRegex
              , calc = [];
            var arr = [df("Y", 1), df("m", 2), df("d", 3), df("h", 4), df("i", 5), df("s", 6), df("P", 7)];
            for (var i = 0, l = arr.length; i < l; ++i) {
                calc.push(arr[i].c)
            }
            return {
                g: 1,
                c: calc.join(""),
                s: arr[0].s + "-" + arr[1].s + "-" + arr[2].s + "T" + arr[3].s + ":" + arr[4].s + ":" + arr[5].s + arr[6].s
            };
        case "U":
            return {
                g: 1,
                c: "u = parseInt(results[" + currentGroup + "], 10);\n",
                s: "(-?\\d+)"
            };
        default:
            return {
                g: 0,
                c: null,
                s: character.replace(/([.*+?^$}{()|[\]\/\\])/g, "\\$1")
            }
        }
    }
    ;
    if ($.browser.safari) {
        Date.brokenSetMonth = Date.prototype.setMonth;
        Date.prototype.setMonth = function(num) {
            if (num <= -1) {
                var n = Math.ceil(-num);
                var back_year = Math.ceil(n / 12);
                var month = (n % 12) ? 12 - n % 12 : 0;
                this.setFullYear(this.getFullYear() - back_year);
                return Date.brokenSetMonth.call(this, month)
            } else {
                return Date.brokenSetMonth.apply(this, arguments)
            }
        }
    }
}
)();

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转载自blog.csdn.net/rrrrrr123rrr/article/details/78716157