Looking for the best way to send/recieve DateTime objects using GRPC Java

[nicholas...@lucidworks.com]

I would like to know the best way to send DateTime objects to and from a GRPC service.

Should I just be sending a string to/from GRPC?

I see there is a Timestamp object but it seems to be not what I'm looking for, I think?

Thanks

[nicholas...@lucidworks.com]

LocalDateTime ldt = the date time object;
Timestamp.newBuilder().setSeconds(ldt.getSecond())
      .setNanos(ldt.getNano()))
    .build()

Would that work?

[nevil...@gmail.com]

Hey,

have you cnsidered sending milliseconds since Epoch?

Extract the time from a Date object: Long dt = new Date().getTime();

I haven't used the Timestamp message, so I don't know how to use that.

[Carl Mastrangelo]

If you are using Protobuf, there is the  google.protobuf.Timestamp message type that you can use to send it.

[Evan Jones]

I second the recommendation for using Timestamp. If you interact with other languages, some of the libraries provide some some nice helper methods to make working with it fairly straightforward. If you use any Google Cloud APIs, you will end up dealing with Timestamps at some point, so you might as well have fewer unique time types in your system.

[Nicholas DiPiazza]

Is this code snippet ok?

LocalDateTime ldt = the date time object we want to send over grpc;

Timestamp.newBuilder().setSeconds(ldt.getSecond())
      .setNanos(ldt.getNano()))
    .build()

Is there a helper method to make it easier?

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[Carl Mastrangelo]

It looks like you are using Java.  In that case, Protobuf provides a helper library to create these, such as fromMillies:

https://github.com/google/protobuf/blob/v3.4.0/java/util/src/main/java/com/google/protobuf/util/Timestamps.java#L279

On Tuesday, October 31, 2017 at 9:24:25 AM UTC-7, Nicholas DiPiazza wrote:

Is this code snippet ok?

LocalDateTime ldt = the date time object we want to send over grpc;

Timestamp.newBuilder().setSeconds(ldt.getSecond())
      .setNanos(ldt.getNano()))
    .build()

Is there a helper method to make it easier?

On Tue, Oct 31, 2017 at 9:23 AM, Evan Jones <evan....@bluecore.com> wrote:

I second the recommendation for using Timestamp. If you interact with other languages, some of the libraries provide some some nice helper methods to make working with it fairly straightforward. If you use any Google Cloud APIs, you will end up dealing with Timestamps at some point, so you might as well have fewer unique time types in your system.

On Monday, October 30, 2017 at 8:18:41 PM UTC-4, Carl Mastrangelo wrote:

If you are using Protobuf, there is the  google.protobuf.Timestamp message type that you can use to send it.

On Friday, October 27, 2017 at 6:31:43 PM UTC-7, nicholas...@lucidworks.com wrote:

I would like to know the best way to send DateTime objects to and from a GRPC service.

Should I just be sending a string to/from GRPC?

I see there is a Timestamp object but it seems to be not what I'm looking for, I think?

Thanks

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[Evan Jones]

A LocalDateTime does not have a time zone, and getSecond() only returns the seconds part of the "human broken down time", so it isn't the same. A Timestamp represents an instant in time, and the seconds part is seconds since the epoch. You probably need something like (I did not even attempt to compile this):

long epochSeconds = ldt.toEpochSeconds(ZoneOffset.UTC);

I believe the nanoseconds part looks correct. If you just want the current time, you can use:

timestamp = Timestamps.fromMillis(System.currentTimeMillis());

https://developers.google.com/protocol-buffers/docs/reference/java/com/google/protobuf/util/Timestamps

Hope that helps!

Evan

[Selcuk Bozdag]

Hi,

You can use epoch milliseconds. If you're working with LocalDateTime for instance:

localDateTime.atZone(ZoneId.systemDefault()) .toInstant().toEpochMilli()

would get you something you need I think.

In proto file define it as a long data. Hope it helps.

[Nicholas DiPiazza]

Great!!! That’s what I was looking for. Thanks for spelling it out to me it was not at all obvious what ZoneId to use

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