JavaScriptカスタムDateDiff関数(すべてのブラウザに対応)

 
  
 
  <br>function NewDate(str) { 
  <br>str = str.split('-'); 
  <br>var date = new Date(); 
  <br>date.setUTCFullYear(str[0], str[1] - 1, str[2]); 
  <br>date.setUTCHours(0, 0, 0, 0); 
  <br>return date; 
  <br>} 
  <br>function TimeCom(dateValue) { 
  <br>var newCom; 
  <br> 
  <br>if (dateValue == "") { 
  <br>newCom = new Date(); 
  <br>} else { 
  <br>newCom = NewDate(dateValue); 
  <br>} 
  <br>this.year = newCom.getYear(); 
  <br>this.month = newCom.getMonth() + 1; 
  <br>this.day = newCom.getDate(); 
  <br>this.hour = newCom.getHours(); 
  <br>this.minute = newCom.getMinutes(); 
  <br>this.second = newCom.getSeconds(); 
  <br>this.msecond = newCom.getMilliseconds(); 
  <br>this.week = newCom.getDay(); 
  <br>} 
  <br>function DateDiff(interval, date1, date2) { 
  <br>var TimeCom1 = new TimeCom(date1); 
  <br>var TimeCom2 = new TimeCom(date2); 
  <br>var result; 
  <br>switch (String(interval).toLowerCase()) { 
  <br>case "y": 
  <br>case "year": 
  <br>result = TimeCom1.year - TimeCom2.year; 
  <br>break; 
  <br>case "m": 
  <br>case "month": 
  <br>result = (TimeCom1.year - TimeCom2.year) * 12 + (TimeCom1.month - TimeCom2.month); 
  <br>break; 
  <br>case "d": 
  <br>case "day": 
  <br>result = Math.round((Date.UTC(TimeCom1.year, TimeCom1.month - 1, TimeCom1.day) - Date.UTC(TimeCom2.year, TimeCom2.month - 1, TimeCom2.day)) / (1000 * 60 * 60 * 24)); 
  <br>break; 
  <br>case "h": 
  <br>case "hour": 
  <br>result = Math.round((Date.UTC(TimeCom1.year, TimeCom1.month - 1, TimeCom1.day, TimeCom1.hour) - Date.UTC(TimeCom2.year, TimeCom2.month - 1, TimeCom2.day, TimeCom2.hour)) / (1000 * 60 * 60)); 
  <br>break; 
  <br>case "min": 
  <br>case "minute": 
  <br>result = Math.round((Date.UTC(TimeCom1.year, TimeCom1.month - 1, TimeCom1.day, TimeCom1.hour, TimeCom1.minute) - Date.UTC(TimeCom2.year, TimeCom2.month - 1, TimeCom2.day, TimeCom2.hour, TimeCom2.minute)) / (1000 * 60)); 
  <br>break; 
  <br>case "s": 
  <br>case "second": 
  <br>result = Math.round((Date.UTC(TimeCom1.year, TimeCom1.month - 1, TimeCom1.day, TimeCom1.hour, TimeCom1.minute, TimeCom1.second) - Date.UTC(TimeCom2.year, TimeCom2.month - 1, TimeCom2.day, TimeCom2.hour, TimeCom2.minute, TimeCom2.second)) / 1000); 
  <br>break; 
  <br>case "ms": 
  <br>case "msecond": 
  <br>result = Date.UTC(TimeCom1.year, TimeCom1.month - 1, TimeCom1.day, TimeCom1.hour, TimeCom1.minute, TimeCom1.second, TimeCom1.msecond) - Date.UTC(TimeCom2.year, TimeCom2.month - 1, TimeCom2.day, TimeCom2.hour, TimeCom2.minute, TimeCom2.second, TimeCom1.msecond); 
  <br>break; 
  <br>case "w": 
  <br>case "week": 
  <br>result = Math.round((Date.UTC(TimeCom1.year, TimeCom1.month - 1, TimeCom1.day) - Date.UTC(TimeCom2.year, TimeCom2.month - 1, TimeCom2.day)) / (1000 * 60 * 60 * 24)) % 7; 
  <br>break; 
  <br>default: 
  <br>result = "invalid"; 
  <br>} 
  <br>return (result); 
  <br>} 
  <br>