Timestamp (Java)ΒΆ

A Timestamp represents a point in time independent of any time zone or local calendar, encoded as a count of seconds and fractions of seconds at nanosecond resolution. The count is relative to an epoch at UTC midnight on January 1, 1970, in the proleptic Gregorian calendar which extends the Gregorian calendar backwards to year one (see Unix time).

A timestamp is required for several elements of the Phenopacket including the MetaData. Usually, code will create a timestamp to represent the current time (the time at which the Phenopacket is being created).

import com.google.protobuf.Timestamp;

long millis  = System.currentTimeMillis();
Timestamp timestamp = Timestamp.newBuilder().setSeconds(millis / 1000)
            .setNanos((int) ((millis % 1000) * 1000000)).build();

It is also possible to create a timestamp for an arbitrary date. For instance, the following code creates a timepoint for an important date in English history.

import com.google.protobuf.Timestamp;
import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAccessor;

String hastings = "1066-10-14T00:00:00.001Z";
TemporalAccessor date = DateTimeFormatter.ISO_DATE_TIME.parse(hastings);
Instant instant = Instant.from(date);
Timestamp timestamp = Timestamp.newBuilder()