Function arrow_cast::parse::string_to_timestamp_nanos

pub fn string_to_timestamp_nanos(s: &str) -> Result<i64, ArrowError>

Accepts a string in RFC3339 / ISO8601 standard format and some variants and converts it to a nanosecond precision timestamp.

See string_to_datetime for the full set of supported formats

Implements the to_timestamp function to convert a string to a timestamp, following the model of spark SQL’s to_timestamp.

Internally, this function uses the chrono library for the datetime parsing

We hope to extend this function in the future with a second parameter to specifying the format string.

Timestamp Precision

Function uses the maximum precision timestamps supported by Arrow (nanoseconds stored as a 64-bit integer) timestamps. This means the range of dates that timestamps can represent is ~1677 AD to 2262 AM

Timezone / Offset Handling

Numerical values of timestamps are stored compared to offset UTC.

This function interprets string without an explicit time zone as timestamps relative to UTC, see string_to_datetime for alternative semantics

In particular:

// Note all three of these timestamps are parsed as the same value
let a = string_to_timestamp_nanos("1997-01-31 09:26:56.123Z").unwrap();
let b = string_to_timestamp_nanos("1997-01-31T09:26:56.123").unwrap();
let c = string_to_timestamp_nanos("1997-01-31T14:26:56.123+05:00").unwrap();

assert_eq!(a, b);
assert_eq!(b, c);