Unix2DateTime

///////////////////////////////////////////////////////////////////// // Script Library Contribution by Flennan Roffo // Logic Scripted Products & Script Services // Peacock Park (183,226,69) // (c) 2007 - Flennan Roffo // // Distributed as GPL // // SCRIPT: Unix2DateTime.lsl // // FUNCTION: // Perform conversion from return value of llGetUnixTimestamp() to // date and time strings. /////////////////////////////////////////////////////////////////////

///////////////////////////// Unix Time conversion //////////////////

integer DAYS_PER_YEAR = 365; // Non leap year integer SECONDS_PER_YEAR = 31536000; // Non leap year integer SECONDS_PER_DAY = 86400; integer SECONDS_PER_HOUR = 3600; integer SECONDS_PER_MINUTE = 60;

list MonthNameList = [ "JAN", "FEB", "MAR", "APR", "MAY", "JUN",

                       "JUL", "AUG", "SEP", "OCT", "NOV", "DEC" ];

////////////////////////////// LeapYear() /////////////////////////////

integer LeapYear(integer year) {

   if (year % 4 == 0)
   {
       if (year % 100 == 0)
       {
           if (year % 400 == 0)
           {
               return 1;
           }
           else
           {
               return 0;
           }
       }
       else
       {
           return 1;
       }
   }
   else
   {
       return 0;
   }

}

////////////////////////////// DaysPerMonth() ///////////////////////////////////////

integer DaysPerMonth(integer year,integer month) {

   if (month < 8)
   {
       if (month % 2 == 0)
       {
           if (month == 2)
           {
               if (LeapYear(year))
               {
                   return 29;
               }
               else
               {
                   return 28;
               }
           }
           else
           {
               return 30;
           }
       }
       else
       {
           return 31;
       }
   }
   else
   {
       if (month % 2 == 0)
       {
           return 31;
       }
       else
       {
           return 30;
       }
   }

}

/////////////////////////// DaysPerYear() ////////////////////////////////////

integer DaysPerYear(integer year) {

   if (LeapYear(year))
       return DAYS_PER_YEAR + 1;
   else
       return DAYS_PER_YEAR;

}

/////////////////////////////////////////////////////////////////////////////////////// // Convert Unix time (integer) to a Date and Time string ///////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////// Unix2DataTime() ///////////////////////////////////////

list Unix2DateTime(integer unixtime) {

   integer days_since_1_1_1970     = unixtime / SECONDS_PER_DAY;
   integer day = days_since_1_1_1970 + 1;
   integer year  = 1970;
   integer days_per_year = DaysPerYear(year);
   
   while (day > days_per_year)
   {
       day -= days_per_year;
       ++year;
       days_per_year = DaysPerYear(year);
   }

   integer month = 1;
   integer days_per_month = DaysPerMonth(year,month);
   
   while (day > days_per_month)
   {
       day -= days_per_month;
       
       if (++month > 12)
       {    
           ++year;
           month = 1;
       }
       
       days_per_month = DaysPerMonth(year,month);
   }

   integer seconds_since_midnight  = unixtime % SECONDS_PER_DAY;
   integer hour        = seconds_since_midnight / SECONDS_PER_HOUR;
   integer second      = seconds_since_midnight % SECONDS_PER_HOUR;
   integer minute      = second / SECONDS_PER_MINUTE;
   second              = second % SECONDS_PER_MINUTE;
   
   return [ year, month, day, hour, minute, second ];

}

///////////////////////////////// MonthName() ////////////////////////////

string MonthName(integer month) {

   if (month >= 0 && month < 12)
       return llList2String(MonthNameList, month);
   else
       return "";

}

///////////////////////////////// DateString() ///////////////////////////

string DateString(list timelist) {

   integer year       = llList2Integer(timelist,0);
   integer month      = llList2Integer(timelist,1);
   integer day        = llList2Integer(timelist,2);
   
   return (string)day + "-" + MonthName(month - 1) + "-" + (string)year;

}

///////////////////////////////// TimeString() ////////////////////////////

string TimeString(list timelist) {

   integer hour        = llList2Integer(timelist,3);
   integer minute      = llList2Integer(timelist,4);
   integer second      = llList2Integer(timelist,5);
   string  hourstr     = (string)hour;
   string  minutestr   = (string)minute;
   string  secondstr   = (string)second;
   
   if (hour < 10)      hourstr     = "0" + hourstr;
   if (minute < 10)    minutestr     = "0" + minutestr;
   if (second < 10)    secondstr    = "0" + secondstr;
   return hourstr + ":" + minutestr + ":" + secondstr;

}

/////////////////////////////////////////////////////////////////////////////// // Convert a date and time to a Unix time integer ///////////////////////////////////////////////////////////////////////////////

////////////////////////// DateTime2Unix() ////////////////////////////////////

integer DateTime2Unix(integer year, integer month, integer day, integer hour, integer minute, integer second) { integer time = 0; integer yr = 1970; integer mt = 1; integer days;

while(yr < year) { days = DaysPerYear(yr++); time += days * SECONDS_PER_DAY; }

while (mt < month) { days = DaysPerMonth(mt++); time += days * SECONDS_PER_DAY; }

days = day - 1; time += days * SECONDS_PER_DAY; time += hour * SECONDS_PER_HOUR; time += minute * SECONDS_PER_MINUTE; time += second;

return time; } ////////////////////////////////////////////// // End Unix2DateTime //////////////////////////////////////////////