GetTimestampOffset

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This function returns llGetTimestamp() with an hour offset. It will wrap day, month and year as required. If it is passed an offset of more than 24 hours either way, it will use the offset for US Pacific Time (SL time), automatically adjusting for DST.

string  sbGetTimestamp(integer  intOffset) {
    // Start with December for purposes of wrapping
    list    lstDays  = [31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
 
    string  strTimestamp = llGetTimestamp();
 
    list    lstTime  = llParseString2List(strTimestamp, ["-", ":", ".", "T"], []);
    integer intYear  = llList2Integer(lstTime, 0);
    integer intMonth = llList2Integer(lstTime, 1);
    integer intDay   = llList2Integer(lstTime, 2);
    integer intHour  = llList2Integer(lstTime, 3);
 
    string  strYear;
    string  strMonth;
    string  strDay;
    string  strHour;
 
    if (intOffset == 0) { return strTimestamp; }
 
    if (intOffset < -24 || intOffset > 24) {
        intOffset = ((integer)llGetWallclock() - (integer)llGetGMTclock()) / 3600;
    }
 
    intHour+= intOffset;
 
    // Add a day to February in leap years
    if (intYear % 4 == 0 && (intYear % 100 != 0 || intYear % 400 == 0)) {
        lstDays = llListReplaceList(lstDays, [29], 2, 2);
    }
 
    if (intOffset < 0) {
        if (intHour < 0) { 
            intHour+= 24;
            --intDay;
        }
 
        if (intDay < 1) {
            intDay = llList2Integer(lstDays, --intMonth);
        }
 
        if (intMonth < 1) {
            intMonth = 12;
            --intYear;
        }
    }
 
    if (intOffset > 0) {
        if (intHour > 23) {
            intHour-= 24;
            ++intDay;
        }
 
        if (intDay > llList2Integer(lstDays, intMonth)) {
            intDay = 1;
            ++intMonth;
        }
 
        if (intMonth > 12) {
            intMonth = 1;
            ++intYear;
        }
    }
 
    strYear  = (string)intYear;
    strMonth = (string)intMonth;
    strDay   = (string)intDay;
    strHour  = (string)intHour;
 
    if (llStringLength(strMonth) < 2) { strMonth = "0" + strMonth; }
    if (llStringLength(strDay)   < 2) { strDay   = "0" + strDay;   }
    if (llStringLength(strHour)  < 2) { strHour  = "0" + strHour;  }
 
    return
        strYear                   + "-" + 
        strMonth                  + "-" + 
        strDay                    + "T" + 
        strHour                   + ":" + 
        llList2String(lstTime, 4) + ":" + 
        llList2String(lstTime, 5) + "." + 
        llList2String(lstTime, 6) + "Z";
        // Obviously this isn't really Z time anymore, but I left it there in case there
        // are scripts expecting it.
}