## LSL Wiki : LibraryTimestampDifference

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A quicky to find the amount of time in seconds between two timestamps. Makes use of a simplified Julian Date formula from Weisstein's World of Science (website listed in the code) that works for years between 1901 and 2099. I include an example function illustrating converting a timestamp to unixtime.

```// Find the difference between two timestamps in seconds
// Works for years between 1901 and 2099
//
// Ben Fassbinder  Oct 17, 2006
//

integer timestamp_diff(string ts1, string ts2)
{
list ts = llParseString2List( ts1, ["-","T",":","Z"] , [] );

integer y = (integer)llList2String(ts, 0);
integer l = (integer)llList2String(ts, 1);
integer d = (integer)llList2String(ts, 2);
integer h = (integer)llList2String(ts, 3);
integer m = (integer)llList2String(ts, 4);
integer s1 = llRound((float)llList2String(ts, 5));

s1 += 60*m + 3600*h;

integer jd1 = julian_date(y, l, d);

ts = llParseString2List( ts2, ["-","T",":","Z"] , [] );

y = (integer)llList2String(ts, 0);
l = (integer)llList2String(ts, 1);
d = (integer)llList2String(ts, 2);
h = (integer)llList2String(ts, 3);
m = (integer)llList2String(ts, 4);
integer s2 = llRound((float)llList2String(ts, 5));

s2 += 60*m + 3600*h;

integer jd2 = julian_date(y, l, d);

return 86400*(jd2 - jd1) + s2 - s1;
}

// Julian date minus a constant (1721013.5)
// since we are only doing differences, the constant is unnecessary.
// valid for dates between 1901 and 2099
//
// source:  http://scienceworld.wolfram.com/astronomy/JulianDate.html

integer julian_date(integer y, integer m, integer d)
{
integer result = 367 * y - llFloor(7.0 *
(y + llFloor( (m+9.0)/12.0 ) )/4.0
);

result += llFloor(275.0*m/9.0) + d;

return result;
}

// timestamp to unix time.
// unix time = 0 corresponds to midnight GMT Jan 1, 1970

integer timestamp_to_unixtime(string ts)
{
return timestamp_diff("1970-01-01T00:00:00Z", ts);
}

default
{
touch_start(integer total_number)
{
integer ut = llGetUnixTime();
integer ts = timestamp_to_unixtime(llGetTimestamp());

llSay(0, (string)ts + " vs. " + (string)ut);
}
}```

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