WZhuo commented on PR #495:
URL: https://github.com/apache/iceberg-cpp/pull/495#issuecomment-3718496913
```
Types.TimestampType type = Types.TimestampType.withoutZone();
Literal<Long> ts = Literal.of("2017-12-01T10:12:55.038194").to(type);
Literal<Long> pts = Literal.of("1970-01-01T00:00:01.000001").to(type);
Literal<Long> nts = Literal.of("1969-12-31T23:59:59.999999").to(type);
Transform<Long, Integer> years = Transforms.year();
assertThat((int) years.bind(type).apply(ts.value()))
.as("Should produce 2017 - 1970 = 47")
.isEqualTo(47);
assertThat((int) years.bind(type).apply(pts.value()))
.as("Should produce 1970 - 1970 = 0")
.isZero();
assertThat((int) years.bind(type).apply(nts.value()))
.as("Should produce 1969 - 1970 = -1")
.isEqualTo(-1);
```
Above is the YearTransform's test case, it should return delta years between
the time and 1970.
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