Thành viên:Trần Nguyễn Minh Huy/Dates.js

//<pre><nowiki>
 
var months_key = new Array('tháng 1','tháng 2','tháng 3','tháng 4','tháng 5','tháng 6','tháng 7','tháng 8','tháng 9','tháng 10','tháng 11','tháng 12');
 
// Will accurately parse the time difference between two dates (years after 1970)
// EXCEPTED formats (all UTC):
// 16:12, January 15, 2001
// 16:12, 15 January 2001
// 16:12, 2001 January 15
// 16:12, Jan 15, 2001
// 16:12, 15 Jan 2001
// 16:12, 2001 Jan 15
// 2001-01-15T16:12:34 <--seconds ignored
// Fri, 10 Nov 2006 17:39
function getElapsedTime(top_date,bottom_date)
{
    // Get top year
    var TYear = retrieveYear(top_date);
    // Get lower year
    var BYear = retrieveYear(bottom_date);
    // Get top month
    var TMonth = retrieveMonth(top_date);
    // Get lower month
    var BMonth = retrieveMonth(bottom_date);
    // Get top date
    var TDay = retrieveDay(top_date);
    // Get lower date
    var BDay = retrieveDay(bottom_date);
    // Get top time
    var TTime = retrieveTime(top_date).split(':');
    // Get lower time
    var BTime = retrieveTime(bottom_date).split(':');
 
    // Get date in ms from start of year 1971
    var rtime = Date.UTC(TYear,TMonth-1,TDay,frmtDateNum(TTime[0]),frmtDateNum(TTime[1]),0);
    var ltime = Date.UTC(BYear,BMonth-1,BDay,frmtDateNum(BTime[0]),frmtDateNum(BTime[1]),0);
 
    // Get difference and convert to days
    var day = 24*60*60*1000; // Days in ms
    return (rtime - ltime)/day;
}
 
// Will accurately parse the time difference between two dates (years after 0)
// counts leap years and febuary month length changes
// EXCEPTED formats:
// 16:12, January 15, 2001
// 16:12, 15 January 2001
// 16:12, 2001 January 15
// 16:12, Jan 15, 2001
// 16:12, 15 Jan 2001
// 16:12, 2001 Jan 15
// 2001-01-15T16:12:34 <--seconds ignored
// Fri, 10 Nov 2006 17:39
function getDateDiff(top_date,bottom_date)
{
    // Get top year
    var TYear = retrieveYear(top_date);
    // Get leap year factor
    var TFEB = getFebDays(TYear);
    // Get lower year
    var BYear = retrieveYear(bottom_date);
    // Get leap year factor
    var BFEB = getFebDays(BYear);
    var months_tvalue = new Array(31, TFEB, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    var months_bvalue = new Array(31, BFEB, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    // Get top month
    var TMonth = retrieveMonth(top_date);
    // Get lower month
    var BMonth = retrieveMonth(bottom_date);
    // Get top date
    var TDay = retrieveDay(top_date);
    // Get lower date
    var BDay = retrieveDay(bottom_date);
    // Get top time and turn it into days
    var TTime = convTimeToDays(retrieveTime(top_date));
    // Get lower time and turn it into days
    var BTime = convTimeToDays(retrieveTime(bottom_date));
    // Parse, months are 1-12, but array starts at 0, so take 1 one the index
    // monthr and monthl get amount of relavent days passed in the recent and old month respectively
    var monthr = TDay - 1 + TTime;
    var monthl = months_bvalue[BMonth-1] - (BDay - 1 + BTime);
    if (TYear == BYear)
    {
        var mdiff = addFullMonths(TMonth-1,BMonth+1,months_tvalue);
        var totdays = monthr + monthl + mdiff;
        if (TMonth == BMonth) 
            {totdays = monthr - (BDay - 1 + BTime);}
    }
    else
    {
        var ydiff = addFullYears(TYear - 1,BYear + 1);
        var yearr = addFullMonths(TMonth - 1,1,months_tvalue) + monthr;
        var yearl = addFullMonths(12,BMonth + 1,months_bvalue) + monthl;
        var totdays = yearr + ydiff + yearl;
    }
    return totdays;
}
 
function addFullYears(T,B)
{
    var tot_days = 0;
    for (var i=T; i>=B; i--)
    {
    FEB = getFebDays(i);
    if (FEB == 28) 
        tot_days += 365;
    else if (FEB == 29) 
        tot_days += 366;
  }
    return tot_days;
}
 
//3rd var is the calendar (for Leap Years)
function addFullMonths(T,B,months_value)
{
    var tot_days = 0;
    for (var i=T; i>=B; i--)
        {tot_days += months_value[i-1];}
    return tot_days;
}
 
function retrieveYear(date)
{
    if (date.search(/\d{4}/) !=-1)
        var Year = date.match(/\d{4}/)[0];
    else 
        alert('[retrieveYear] Lỗi tại: ' + date);
    return Year;
}
 
// Returns 1-12
function retrieveMonth(date)
{
    if (date.search(/-\d{1,2}-/) !=-1) 
        {var Month = date.match(/-\d{1,2}-/)[0].replace(/-/g,''); return frmtDateNum(Month);}
    for (var i=0; i<months_key.length; i++)
    {
    if (date.search(months_key[i]) !=-1) 
        {Month = i+1; break;}
    //else if (date.search(months_key[i].substring(0,3)) !=-1)
    //    {Month = i+1; break;}
    }
    return Month;
}
 
// Returns 1-31
function retrieveDay(date)
{
    if (date.search(/[ngày ,-]\d{1,2}([ ,T]|$)/) !=-1) 
        var Days = date.match(/[ ,-]\d{1,2}([ ,T]|$)/)[0].replace(/[-, T]/g,'');
    else 
        alert('[retrieveDay] Error at: ' + date);
    Days = frmtDateNum(Days);
    return Days;
}
 
function retrieveTime(date)
{
    if (date.search(/^\d\d:\d\d,/) !=-1)
        var Time = date.match(/^\d\d:\d\d,/)[0];
    else if (date.search(/T\d\d:\d\d/) !=-1) 
        var Time = date.match(/T\d\d:\d\d/)[0];
    else if (date.search(/ \d\d:\d\d$/) !=-1) 
        var Time = date.match(/ \d\d:\d\d$/)[0];
    else if (date.search(/ \d\d:\d\d:/) !=-1) 
        var Time = date.match(/ \d\d:\d\d:/)[0];
    else alert('[retrieveTime] Error at: ' + date);
 
    Time = Time.replace(/[ T,]|:$/g,'');
    return Time;
}
 
function getFebDays(Year)
{
    var LP4 = Year/4; var LP100 = Year/100; var LP400 = Year/400;
    if (Math.round(LP4) == LP4 && (Math.round(LP100) != LP100 || Math.round(LP400) == LP400)) 
        var FEB = 29;
    else 
        var FEB = 28;
    return FEB;
}
 
//remove pointless zeros
function frmtDateNum(number)
{
    number = new String(number);
    x = (number=='0') ? 0 : number.replace(/^0+/g,'');
    return x;
}
 
//converts a time into days
function convTimeToDays(Time)
{
    var mins = frmtDateNum(Time.split(':')[1]); var hours = frmtDateNum(Time.split(':')[0]);
    TimeDays = (hours + (mins/60))/24;
    return TimeDays;
}
 
// 16:12, January 15, 2001
// 16:12, Jan 15, 2001
// 16:12, 15 January 2001
// 16:12, 15 Jan 2001
// 16:12, 2001 January 15
// 16:12, 2001 Jan 15
// 2001-01-15T16:12
// Fri, 10 Nov 2006 17:39
var STAND_DATE_REGEXP = /\d{1,2}:\d\d, [^ ]+ \d{1,2}, \d\d\d\d|\d{1,2}:\d\d, \d{1,2} [^ ]+ \d\d\d\d|\d{1,2}:\d\d,\d\d\d\d [^ ]+ \d{1,2}|\d\d\d\d-\d\d-\d\dT\d{1,2}:\d\d|[^ ]+, \d{1,2} [^ ]+ \d\d\d\d \d{1,2}:\d\d/g;
//////
 
//</nowiki></pre>