JS日期计算

1./**  
2. * 判断是不是一个正确的时间 yyyy-MM-dd  
3. * @param {String} str  
4. * @return {Date}  
5. */  
6.Date.isSimpleDate = function(str){   
7.    var   reg   =   /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/;   
8.    var r = str.match(reg);   
9.    if(r==null)return   null;   
10.    var   d=   new   Date(r[1], r[3]-1,r[4]);   
11.    var   newStr=d.getFullYear() + "-";   
12.    newStr+=(((d.getMonth()+1)<10&&r[3].length>1)?('0'+(d.getMonth()+1)):(d.getMonth()+1)) + "-" ;   
13.    newStr+=(((d.getDate())<10 && r[4].length>1)?('0'+d.getDate()):d.getDate());   
14.    if(newStr==str){   
15.        return d;   
16.    }else{   
17.        return null;   
18.    }   
19.}   
20./**  
21. * 判断是不是一个正确的时间类型 yyyy-MM-dd hh  
22. * @param {Object} str  
23. */  
24.Date.isDateHH = function(str){   
25.    var   reg   =   /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2})$/;   
26.    var r = str.match(reg);   
27.    if(r==null)return   null;   
28.    var   d=   new   Date(r[1], r[3]-1,r[4],r[5]);   
29.    var   newStr=d.getFullYear() + "-";   
30.    newStr+=(((d.getMonth()+1)<10&&r[3].length>1)?('0'+(d.getMonth()+1)):(d.getMonth()+1)) + "-" ;   
31.    newStr+=(((d.getDate())<10 && r[4].length>1)?('0'+d.getDate()):d.getDate()) + " ";   
32.    newStr+=((d.getHours()<10&&r[5].length>1)?('0'+d.getHours()):d.getHours());   
33.    if(newStr==str){   
34.        return d;   
35.    }else{   
36.        return null;   
37.    }   
38.}   
39./**  
40. * 判断是不是一个正确的时间类型 yyyy-MM-dd hh:mm  
41. * @param {String} str  
42. */  
43.Date.isDateHHMM = function(str){   
44.    var   reg   =   /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2})$/;   
45.    var   r   =   str.match(reg);   
46.    if(r==null)return   null;   
47.    var   d=   new   Date(r[1], r[3]-1,r[4],r[5],r[6]);   
48.    var   newStr=d.getFullYear() + "-";   
49.    newStr+=(((d.getMonth()+1)<10&&r[3].length>1)?('0'+(d.getMonth()+1)):(d.getMonth()+1)) + "-" ;   
50.    newStr+=(((d.getDate())<10 && r[4].length>1)?('0'+d.getDate()):d.getDate()) + " ";   
51.    newStr += ((d.getHours()<10&&r[5].length>1)?('0'+d.getHours()):d.getHours())+":";   
52.    newStr += ((d.getMinutes()<10&&r[6].length>1)?('0'+d.getMinutes()):d.getMinutes());   
53.    if(newStr==str){   
54.        return d;   
55.    }else{   
56.        return null;   
57.    }   
58.}   
59./**  
60. * 判断是不是一个正确的时间类型 yyyy-MM-dd hh:mm:ss  
61. * @param {String} str  
62. */  
63.Date.isDateHHMMSS = function(str){   
64.    var   reg   =   /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/;   
65.    var   r   =   str.match(reg);   
66.    if(r==null)return   null;   
67.    var   d=   new   Date(r[1], r[3]-1,r[4],r[5],r[6],r[7]);   
68.    var   newStr=d.getFullYear() + "-";   
69.    newStr+=(((d.getMonth()+1)<10&&r[3].length>1)?('0'+(d.getMonth()+1)):(d.getMonth()+1)) + "-" ;   
70.    newStr+=(((d.getDate())<10 && r[4].length>1)?('0'+d.getDate()):d.getDate()) + " ";   
71.    newStr += (((d.getHours()<10&&r[5].length>1)?('0'+d.getHours()):d.getHours()))+":";   
72.    newStr += (((d.getMinutes()<10&&r[6].length>1)?('0'+d.getMinutes()):d.getMinutes())) + ":";   
73.    newStr += ((d.getSeconds()<10&&r[7].length>1)?('0'+d.getSeconds()):d.getSeconds());   
74.    if(newStr==str){   
75.        return d;   
76.    }else{   
77.        return null;   
78.    }   
79.}   
80./***  
81. * 判断是日期1是不是在日期2后面  
82. * @param {Date/String} d1  
83. * @param {Date/String} d2  
84. * @return {Boolean} true 小于日期2  
85. */  
86.Date.before = function(d1,d2){   
87.    if((typeof d1 == 'object' && d1.constructor == Date) && (typeof d2 == 'object' && d2.constructor == Date)){   
88.        if(d1<=d2){   
89.            return true;   
90.        }else{   
91.            return false;   
92.        }   
93.    }else if((typeof d1 == 'string' && d1.constructor == String) && (typeof d2 == 'string' && d2.constructor == String)){   
94.  
95.        var date1 = Date.isSimpleDate(d1)!=null?Date.isSimpleDate(d1):Date.isDateHH(d1);   
96.        date1 = date1!=null?date1:Date.isDateHHMM(d1);   
97.        date1 = date1!=null?date1:Date.isDateHHMMSS(d1);   
98.        var date2 = Date.isSimpleDate(d2)!=null?Date.isSimpleDate(d2):Date.isDateHH(d2);   
99.        date2 = date2!=null?date2:Date.isDateHHMM(d2)   
100.        date2 = date2!=null?date2:Date.isDateHHMMSS(d2);   
101.        if(date1==null||date2==null){   
102.            alert("日期格式不正确!");   
103.            return false;   
104.        }   
105.        if(date1<=date2){   
106.            return true;   
107.        }else{   
108.            return false;   
109.        }   
110.    }else if((typeof d1 == 'string' && d1.constructor == String) && (typeof d2 == 'object' && d2.constructor == Date)){   
111.  
112.        var date1 = Date.isSimpleDate(d1)!=null?Date.isSimpleDate(d1):Date.isDateHH(d1);   
113.        date1 = date1!=null?date1:Date.isDateHHMM(d1);   
114.        date1 = date1!=null?date1:Date.isDateHHMMSS(d1);   
115.        if(date1==null||d2==null){   
116.            alert("日期格式不正确!");   
117.            return false;   
118.        }   
119.        if(date1<=d2){   
120.            return true;   
121.        }else{   
122.            return false;   
123.        }   
124.    }else if((typeof d1 == 'object' && d1.constructor == Date) && (typeof d2 == 'string' && d2.constructor == String)){   
125.  
126.        var date2 = Date.isSimpleDate(d2)!=null?Date.isSimpleDate(d2):Date.isDateHH(d2);   
127.        date2 = date2!=null?date2:Date.isDateHHMM(d2)   
128.        date2 = date2!=null?date2:Date.isDateHHMMSS(d2);   
129.        if(d1==null||date2==null){   
130.            alert("日期格式不正确!");   
131.            return false;   
132.        }   
133.        if(d1<=date2){   
134.            return true;   
135.        }else{   
136.            return false;   
137.        }   
138.    }else{   
139.        alert("无法判断输入数据类型！");   
140.        return false;   
141.    }   
142.}