CODEWITHSUNDEEP
timestampformaterlang
Ray
Ray

Reputation: 63

How to convert Erlang:timestamp() to normal date format?

I would like to convert the result of erlang:timestamp() to the normal date type, Gregorian Calendar type.

Normal Date type means "Day-Month-Year, Hour:Minutes:seconds".

ExampleTime = erlang:timeStamp(),

ct:pal("~p", [ExampleTime]).

This shows {1568,869478,181646}

I guess the unit is the second, but not sure of what it stands for.

How it can be converted with code and its concept. Be more specific, I do not know but for an example,

{1568, 869478, 181646} == {Year+Month,day,hour+minutes}.

Upvotes: 3

Views: 3849

Answers (4)

Máté
Máté

Reputation: 2345

I've been using this function when it comes to converting to human readable timestamps from erlang:timestamp():

format_utc_timestamp(TS, Separator) ->
    {_,_,Micro} = TS,
    {{Year,Month,Day},{Hour,Minute,Second}} = 
        calendar:now_to_universal_time(TS),
    io_lib:format("~4w-~2..0w-~2..0w~s~2..0w:~2..0w:~2..0w.~6..0w",
              [Year,Month,Day,Separator,Hour,Minute,Second,Micro]).

Where TS is the timestamp value of {MegaSecs, Secs, MicroSecs} and Separator is a string to be used to pretty print the timestamp. This will give you the format, with T as the separator:

2019-09-25T10:19:19.020202

If you'd like to get an ISO 8601 timestamp, you can do the following formatting on the last line of the function above:

io_lib:format("~4w-~2..0w-~2..0wT~w:~2..0w:~2..0wZ", [Year,Month,Day,Hour,Minute,Second])

Which will result in 2014-09-22T20:53:44Z

Upvotes: 1

vkatsuba
vkatsuba

Reputation: 1449

Here is example of generate ISO 8601 format:

1> {{Year, Month, Day}, {Hour, Min, Sec}} = calendar:now_to_datetime(erlang:timestamp()).
{{2019,9,19},{15,7,3}}
2> list_to_binary(io_lib:format("~.4.0w-~.2.0w-~.2.0wT~.2.0w:~.2.0w:~.2.0w.0+00:00", [Year, Month, Day, Hour, Min, Sec])).
<<"2019-09-19T15:07:03.0+00:00">>

Or you can use erlang:universaltime() instead calendar:now_to_datetime(erlang:timestamp()) for get universal time

Upvotes: 0

alking
alking

Reputation: 91

here is my code:

{{Y,M,D},{ H,MM,SS}} = calendar:now_to_datetime({MegaSecs,Secs,MicroSecs }),

lists:flatten(io_lib:format("~B-~2.10.0B-~2.10.0B ~2.10.0B:~2.10.0B:~2.10.0B", [Y, M, D,H,MM,SS])).

% result like 2019-09-18 12:00:00

Upvotes: 1

Pascal
Pascal

Reputation: 14042

Please, look at the documentation erlang:timestamp(), it says

erlang:timestamp() -> Timestamp

Types

Timestamp = timestamp()

timestamp() =

{MegaSecs :: integer() >= 0,

 Secs :: integer() >= 0,

MicroSecs :: integer() >= 0}

Returns current Erlang system time on the format {MegaSecs, Secs, MicroSecs}...

Then the module calendar of the stdlib library offers several conversion functions such as calendar:now_to_datetime(Now) :

1> calendar:now_to_datetime({1568,869478,181646}).
{{2019,9,19},{5,4,38}}

Upvotes: 4

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