FromUnixTime ?

Questions
1

Here are 2 ways of converting UnixTime in date objects:

unixTime = Range[100000];

(1) dates = FromUnixTime /@ unixTime;

(2) dates = DateObject /@ Table[{1970, 1, 1, 2, 0, unixTime[[i]]}, {i, Length[unixTime]}];

The first method takes about 3.5 min and the second about 2 sec.

I am wondering then, what’s the point in having FromUnixTime[]?

2

Hi Sandu,

I can reproduce that. Your second command should read:

dates = DateObject /@ Table[{1970, 1, 1, 1, 0, unixTime[[i]]}, {i, Length[unixTime]}];

Difficult to see why the built-in command takes about 100 times longer to evaluate.

Cheers,

Marco

3

Hi, Marco

I used {1970, 1, 1, 2, 0, ~} to adjust for the time zone. Forgot to mention.