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| <div class="subTitle">org.apache.arrow.flatbuf</div> |
| <h2 title="Class Timestamp" class="title">Class Timestamp</h2> |
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| <li>com.google.flatbuffers.Table</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.arrow.flatbuf.Timestamp</li> |
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| <pre>public final class <span class="typeNameLabel">Timestamp</span> |
| extends com.google.flatbuffers.Table</pre> |
| <div class="block">Timestamp is a 64-bit signed integer representing an elapsed time since a |
| fixed epoch, stored in either of four units: seconds, milliseconds, |
| microseconds or nanoseconds, and is optionally annotated with a timezone. |
| |
| Timestamp values do not include any leap seconds (in other words, all |
| days are considered 86400 seconds long). |
| |
| Timestamps with a non-empty timezone |
| ------------------------------------ |
| |
| If a Timestamp column has a non-empty timezone value, its epoch is |
| 1970-01-01 00:00:00 (January 1st 1970, midnight) in the *UTC* timezone |
| (the Unix epoch), regardless of the Timestamp's own timezone. |
| |
| Therefore, timestamp values with a non-empty timezone correspond to |
| physical points in time together with some additional information about |
| how the data was obtained and/or how to display it (the timezone). |
| |
| For example, the timestamp value 0 with the timezone string "Europe/Paris" |
| corresponds to "January 1st 1970, 00h00" in the UTC timezone, but the |
| application may prefer to display it as "January 1st 1970, 01h00" in |
| the Europe/Paris timezone (which is the same physical point in time). |
| |
| One consequence is that timestamp values with a non-empty timezone |
| can be compared and ordered directly, since they all share the same |
| well-known point of reference (the Unix epoch). |
| |
| Timestamps with an unset / empty timezone |
| ----------------------------------------- |
| |
| If a Timestamp column has no timezone value, its epoch is |
| 1970-01-01 00:00:00 (January 1st 1970, midnight) in an *unknown* timezone. |
| |
| Therefore, timestamp values without a timezone cannot be meaningfully |
| interpreted as physical points in time, but only as calendar / clock |
| indications ("wall clock time") in an unspecified timezone. |
| |
| For example, the timestamp value 0 with an empty timezone string |
| corresponds to "January 1st 1970, 00h00" in an unknown timezone: there |
| is not enough information to interpret it as a well-defined physical |
| point in time. |
| |
| One consequence is that timestamp values without a timezone cannot |
| be reliably compared or ordered, since they may have different points of |
| reference. In particular, it is *not* possible to interpret an unset |
| or empty timezone as the same as "UTC". |
| |
| Conversion between timezones |
| ---------------------------- |
| |
| If a Timestamp column has a non-empty timezone, changing the timezone |
| to a different non-empty value is a metadata-only operation: |
| the timestamp values need not change as their point of reference remains |
| the same (the Unix epoch). |
| |
| However, if a Timestamp column has no timezone value, changing it to a |
| non-empty value requires to think about the desired semantics. |
| One possibility is to assume that the original timestamp values are |
| relative to the epoch of the timezone being set; timestamp values should |
| then adjusted to the Unix epoch (for example, changing the timezone from |
| empty to "Europe/Paris" would require converting the timestamp values |
| from "Europe/Paris" to "UTC", which seems counter-intuitive but is |
| nevertheless correct). |
| |
| Guidelines for encoding data from external libraries |
| ---------------------------------------------------- |
| |
| Date & time libraries often have multiple different data types for temporal |
| data. In order to ease interoperability between different implementations the |
| Arrow project has some recommendations for encoding these types into a Timestamp |
| column. |
| |
| An "instant" represents a physical point in time that has no relevant timezone |
| (for example, astronomical data). To encode an instant, use a Timestamp with |
| the timezone string set to "UTC", and make sure the Timestamp values |
| are relative to the UTC epoch (January 1st 1970, midnight). |
| |
| A "zoned date-time" represents a physical point in time annotated with an |
| informative timezone (for example, the timezone in which the data was |
| recorded). To encode a zoned date-time, use a Timestamp with the timezone |
| string set to the name of the timezone, and make sure the Timestamp values |
| are relative to the UTC epoch (January 1st 1970, midnight). |
| |
| (There is some ambiguity between an instant and a zoned date-time with the |
| UTC timezone. Both of these are stored the same in Arrow. Typically, |
| this distinction does not matter. If it does, then an application should |
| use custom metadata or an extension type to distinguish between the two cases.) |
| |
| An "offset date-time" represents a physical point in time combined with an |
| explicit offset from UTC. To encode an offset date-time, use a Timestamp |
| with the timezone string set to the numeric timezone offset string |
| (e.g. "+03:00"), and make sure the Timestamp values are relative to |
| the UTC epoch (January 1st 1970, midnight). |
| |
| A "naive date-time" (also called "local date-time" in some libraries) |
| represents a wall clock time combined with a calendar date, but with |
| no indication of how to map this information to a physical point in time. |
| Naive date-times must be handled with care because of this missing |
| information, and also because daylight saving time (DST) may make |
| some values ambiguous or nonexistent. A naive date-time may be |
| stored as a struct with Date and Time fields. However, it may also be |
| encoded into a Timestamp column with an empty timezone. The timestamp |
| values should be computed "as if" the timezone of the date-time values |
| was UTC; for example, the naive date-time "January 1st 1970, 00h00" would |
| be encoded as timestamp value 0.</div> |
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| <td class="colFirst"><code>static class </code></td> |
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| <code>bb, bb_pos</code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#Timestamp--">Timestamp</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#Z:Z__assign-int-java.nio.ByteBuffer-">__assign</a></span>(int _i, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#Z:Z__init-int-java.nio.ByteBuffer-">__init</a></span>(int _i, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#addTimezone-com.google.flatbuffers.FlatBufferBuilder-int-">addTimezone</a></span>(com.google.flatbuffers.FlatBufferBuilder builder, |
| int timezoneOffset)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#addUnit-com.google.flatbuffers.FlatBufferBuilder-short-">addUnit</a></span>(com.google.flatbuffers.FlatBufferBuilder builder, |
| short unit)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#createTimestamp-com.google.flatbuffers.FlatBufferBuilder-short-int-">createTimestamp</a></span>(com.google.flatbuffers.FlatBufferBuilder builder, |
| short unit, |
| int timezoneOffset)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#endTimestamp-com.google.flatbuffers.FlatBufferBuilder-">endTimestamp</a></span>(com.google.flatbuffers.FlatBufferBuilder builder)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#getRootAsTimestamp-java.nio.ByteBuffer-">getRootAsTimestamp</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#getRootAsTimestamp-java.nio.ByteBuffer-org.apache.arrow.flatbuf.Timestamp-">getRootAsTimestamp</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb, |
| <a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a> obj)</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#startTimestamp-com.google.flatbuffers.FlatBufferBuilder-">startTimestamp</a></span>(com.google.flatbuffers.FlatBufferBuilder builder)</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#timezone--">timezone</a></span>()</code> |
| <div class="block">The timezone is an optional string indicating the name of a timezone, |
| one of: |
| |
| * As used in the Olson timezone database (the "tz database" or |
| "tzdata"), such as "America/New_York".</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#timezoneAsByteBuffer--">timezoneAsByteBuffer</a></span>()</code> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#timezoneInByteBuffer-java.nio.ByteBuffer-">timezoneInByteBuffer</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb)</code> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#unit--">unit</a></span>()</code> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/flatbuf/Timestamp.html#ValidateVersion--">ValidateVersion</a></span>()</code> </td> |
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| <code>__has_identifier, __indirect, __indirect, __offset, __offset, __reset, __reset, __string, __string, __union, __union, __vector_as_bytebuffer, __vector_in_bytebuffer, __vector_len, __vector, compareStrings, compareStrings, getByteBuffer, keysCompare, sortTables</code></li> |
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| <h4>Timestamp</h4> |
| <pre>public Timestamp()</pre> |
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| <pre>public static <a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a> getRootAsTimestamp(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb)</pre> |
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| <pre>public static <a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a> getRootAsTimestamp(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb, |
| <a href="../../../../org/apache/arrow/flatbuf/Timestamp.html" title="class in org.apache.arrow.flatbuf">Timestamp</a> obj)</pre> |
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| <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> _bb)</pre> |
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| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> timezone()</pre> |
| <div class="block">The timezone is an optional string indicating the name of a timezone, |
| one of: |
| |
| * As used in the Olson timezone database (the "tz database" or |
| "tzdata"), such as "America/New_York". |
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| |
| Whether a timezone string is present indicates different semantics about |
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| <pre>public static int createTimestamp(com.google.flatbuffers.FlatBufferBuilder builder, |
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| <pre>public static void startTimestamp(com.google.flatbuffers.FlatBufferBuilder builder)</pre> |
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| <pre>public static void addUnit(com.google.flatbuffers.FlatBufferBuilder builder, |
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| <pre>public static void addTimezone(com.google.flatbuffers.FlatBufferBuilder builder, |
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| <pre>public static int endTimestamp(com.google.flatbuffers.FlatBufferBuilder builder)</pre> |
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