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datetime.rs
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use crate::numbers::{float_parse_bytes, IntFloat};
use crate::TimeConfigBuilder;
use crate::{time::TimeConfig, Date, ParseError, Time};
use std::cmp::Ordering;
use std::fmt;
use std::str::FromStr;
use std::time::SystemTime;
/// A DateTime
///
/// Combines a [Date], [Time].
/// Allowed values:
/// * `YYYY-MM-DDTHH:MM:SS` - all the above time formats are allowed for the time part
/// * `YYYY-MM-DD HH:MM:SS` - `T`, `t`, ` ` and `_` are allowed as separators
/// * `YYYY-MM-DDTHH:MM:SSZ` - `Z` or `z` is allowed as timezone
/// * `YYYY-MM-DDTHH:MM:SS+08:00`- positive and negative timezone are allowed,
/// as per ISO 8601, U+2212 minus `−` is allowed as well as ascii minus `-` (U+002D)
/// * `YYYY-MM-DDTHH:MM:SS+0800` - the colon (`:`) in the timezone is optional
///
/// # Comparison
///
/// `DateTime` supports equality (`==`) and inequality (`>`, `<`, `>=`, `<=`) comparisons.
///
/// See [DateTime::partial_cmp] for how this works.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct DateTime {
/// date part of the datetime
pub date: Date,
/// time part of the datetime
pub time: Time,
}
impl fmt::Display for DateTime {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.date)?;
write!(f, "T")?;
write!(f, "{}", self.time)?;
Ok(())
}
}
impl FromStr for DateTime {
type Err = ParseError;
#[inline]
fn from_str(s: &str) -> Result<Self, Self::Err> {
// Delegate to parse_str, which is more permissive - users can call parse_str_rfc3339 directly instead if they
// want to be stricter
Self::parse_str(s)
}
}
impl PartialOrd for DateTime {
/// Compare two datetimes by inequality.
///
/// `DateTime` supports equality (`==`, `!=`) and inequality comparisons (`>`, `<`, `>=` & `<=`).
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt1 = DateTime::parse_str("2020-02-03T04:05:06.07").unwrap();
/// let dt2 = DateTime::parse_str("2020-02-03T04:05:06.08").unwrap();
///
/// assert!(dt2 > dt1);
/// ```
///
/// # Comparison with Timezones
///
/// When comparing two datetimes, we want "less than" or "greater than" refer to "earlier" or "later"
/// in the absolute course of time. We therefore need to be careful when comparing datetimes with different
/// timezones. (If it wasn't for timezones, we could omit all this extra logic and thinking and just compare
/// struct members directly as we do with [Date] and [crate::Duration]).
///
/// From [wikipedia](https://en.wikipedia.org/wiki/UTC_offset#Time_zones_and_time_offsets)
///
/// > The UTC offset is an amount of time subtracted from or added to UTC time to specify the local solar time...
///
/// So, we can imagine that at 3pm in the UK (UTC+0) (in winter, to avoid DST confusion) it's 4pm in France (UTC+1).
///
/// Thus to compare two datetimes in absolute terms we need to **SUBTRACT** the timezone offset.
///
/// As if timezones weren't complicated enough, there are three extra considerations here:
/// 1. **naïve vs. non-naïve:** We also have to consider the case where one datetime has a timezone and the other
/// does not (e.g. is "timezone "naïve"). When comparing naïve datetimes to non-naïve, this library
/// assumes the naïve datetime has the same timezone as the non-naïve, this is different to other
/// implementations (e.g. python) where such comparisons fail.
/// 2. **Direction:** As described in PostgreSQL's docs, in the POSIX Time Zone Specification
/// "The positive sign is used for zones west of Greenwich", which is opposite to the ISO-8601 sign convention.
/// In other words, the offset is reversed, see the end of
/// [this blog](http://blog.untrod.com/2016/08/actually-understanding-timezones-in-postgresql.html)
/// and the [PostgreSQL docs](https://www.postgresql.org/docs/14/datetime-posix-timezone-specs.html) for more
/// info.
/// 3. **Equality comparison:** None of this logic is used for equality (`==`) comparison where we can just compare
/// struct members directly, e.g. require the timezone offset to be the same for two datetimes to be equal.
///
/// ## Timezone Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt_uk_3pm = DateTime::parse_str("2000-01-01T15:00:00Z").unwrap();
/// let dt_france_4pm = DateTime::parse_str("2000-01-01T16:00:00+01:00").unwrap();
///
/// assert!(dt_uk_3pm >= dt_france_4pm); // the two dts are actually the same instant
/// assert!(dt_uk_3pm <= dt_france_4pm); // the two dts are actually the same instant
/// assert_ne!(dt_uk_3pm, dt_france_4pm); // no equal because timezones much match for equality
///
/// let dt_uk_330pm = DateTime::parse_str("2000-01-01T15:30:00Z").unwrap();
///
/// assert!(dt_uk_330pm > dt_uk_3pm);
/// assert!(dt_uk_330pm > dt_france_4pm);
///
/// // as described in point 1 above, naïve datetimes are assumed to
/// // have the same timezone as the non-naïve
/// let dt_naive_330pm = DateTime::parse_str("2000-01-01T15:30:00").unwrap();
/// assert!(dt_uk_3pm < dt_naive_330pm);
/// assert!(dt_france_4pm > dt_naive_330pm);
/// ```
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
match (self.time.tz_offset, other.time.tz_offset) {
(Some(_), Some(_)) => match self.timestamp_tz().partial_cmp(&other.timestamp_tz()) {
Some(Ordering::Equal) => self.time.microsecond.partial_cmp(&other.time.microsecond),
otherwise => otherwise,
},
_ => match self.date.partial_cmp(&other.date) {
Some(Ordering::Equal) => self.time.partial_cmp(&other.time),
otherwise => otherwise,
},
}
}
}
impl DateTime {
/// Parse a datetime from a string
///
/// # Arguments
///
/// * `str` - The string to parse
///
/// # Examples
///
/// ```
/// use speedate::{DateTime, Date, Time};
///
/// let dt = DateTime::parse_str("2022-01-01T12:13:14Z").unwrap();
/// assert_eq!(
/// dt,
/// DateTime {
/// date: Date {
/// year: 2022,
/// month: 1,
/// day: 1,
/// },
/// time: Time {
/// hour: 12,
/// minute: 13,
/// second: 14,
/// microsecond: 0,
/// tz_offset: Some(0),
/// },
/// }
/// );
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14Z");
/// ```
///
/// With a non-zero timezone
/// (we also use a different separator and omit the colon in timezone here):
///
/// ```
/// use speedate::{DateTime, Date, Time};
///
/// let dt = DateTime::parse_str_rfc3339("2000-02-29 12:13:14-0830").unwrap();
/// assert_eq!(
/// dt,
/// DateTime {
/// date: Date {
/// year: 2000,
/// month: 2,
/// day: 29,
/// },
/// time: Time {
/// hour: 12,
/// minute: 13,
/// second: 14,
/// microsecond: 0,
/// tz_offset: Some(-30600),
/// },
/// }
/// );
/// assert_eq!(dt.to_string(), "2000-02-29T12:13:14-08:30");
/// ```
/// (note: the string representation is still canonical ISO8601)
#[inline]
pub fn parse_str_rfc3339(str: &str) -> Result<Self, ParseError> {
Self::parse_bytes_rfc3339(str.as_bytes())
}
/// As with [DateTime::parse_str] but also supports unix timestamps.
///
/// # Arguments
///
/// * `bytes` - The bytes to parse
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt = DateTime::parse_str("2022-01-01T12:13:14Z").unwrap();
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14Z");
///
/// let dt = DateTime::parse_str("1641039194").unwrap();
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14");
/// ```
pub fn parse_str(str: &str) -> Result<Self, ParseError> {
Self::parse_bytes(str.as_bytes())
}
/// Parse a datetime from bytes using RFC 3339 format
///
/// # Arguments
///
/// * `bytes` - The bytes to parse
///
/// # Examples
///
/// ```
/// use speedate::{DateTime, Date, Time};
///
/// let dt = DateTime::parse_bytes_rfc3339(b"2022-01-01T12:13:14Z").unwrap();
/// assert_eq!(
/// dt,
/// DateTime {
/// date: Date {
/// year: 2022,
/// month: 1,
/// day: 1,
/// },
/// time: Time {
/// hour: 12,
/// minute: 13,
/// second: 14,
/// microsecond: 0,
/// tz_offset: Some(0),
/// },
/// }
/// );
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14Z");
/// ```
pub fn parse_bytes_rfc3339(bytes: &[u8]) -> Result<Self, ParseError> {
DateTime::parse_bytes_rfc3339_with_config(bytes, &TimeConfigBuilder::new().build())
}
/// Same as `parse_bytes_rfc3339` with with a `TimeConfig` parameter.
///
/// # Arguments
///
/// * `bytes` - The bytes to parse
/// * `config` - The `TimeConfig` to use
///
/// # Examples
///
/// ```
/// use speedate::{DateTime, Date, Time, TimeConfigBuilder};
///
/// let dt = DateTime::parse_bytes_rfc3339_with_config(b"2022-01-01T12:13:14Z", &TimeConfigBuilder::new().build()).unwrap();
/// assert_eq!(
/// dt,
/// DateTime {
/// date: Date {
/// year: 2022,
/// month: 1,
/// day: 1,
/// },
/// time: Time {
/// hour: 12,
/// minute: 13,
/// second: 14,
/// microsecond: 0,
/// tz_offset: Some(0),
/// },
/// }
/// );
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14Z");
/// ```
pub fn parse_bytes_rfc3339_with_config(bytes: &[u8], config: &TimeConfig) -> Result<Self, ParseError> {
// First up, parse the full date if we can
let date = Date::parse_bytes_partial(bytes)?;
// Next parse the separator between date and time
let sep = bytes.get(10).copied();
if sep != Some(b'T') && sep != Some(b't') && sep != Some(b' ') && sep != Some(b'_') {
return Err(ParseError::InvalidCharDateTimeSep);
}
// Next try to parse the time
let time = Time::parse_bytes_offset(bytes, 11, config)?;
Ok(Self { date, time })
}
/// As with [DateTime::parse_bytes_rfc3339] but also supports unix timestamps.
///
/// # Arguments
///
/// * `bytes` - The bytes to parse
///
/// # Examples
///
/// ```
/// use speedate::{DateTime, Date, Time};
///
/// let dt = DateTime::parse_bytes(b"2022-01-01T12:13:14Z").unwrap();
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14Z");
///
/// let dt = DateTime::parse_bytes(b"1641039194").unwrap();
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14");
/// ```
pub fn parse_bytes(bytes: &[u8]) -> Result<Self, ParseError> {
DateTime::parse_bytes_with_config(bytes, &TimeConfigBuilder::new().build())
}
/// Same as `DateTime::parse_bytes` but supporting TimeConfig
///
/// # Arguments
///
/// * `bytes` - The bytes to parse
/// * `config` - The TimeConfig to use when parsing the time portion
///
/// # Examples
///
/// ```
/// use speedate::{DateTime, Date, Time, TimeConfigBuilder};
///
/// let dt = DateTime::parse_bytes_with_config(b"2022-01-01T12:13:14Z", &TimeConfigBuilder::new().build()).unwrap();
/// assert_eq!(dt.to_string(), "2022-01-01T12:13:14Z");
/// ```
pub fn parse_bytes_with_config(bytes: &[u8], config: &TimeConfig) -> Result<Self, ParseError> {
match Self::parse_bytes_rfc3339_with_config(bytes, config) {
Ok(d) => Ok(d),
Err(e) => match float_parse_bytes(bytes) {
IntFloat::Int(int) => Self::from_timestamp_with_config(int, 0, config),
IntFloat::Float(float) => {
let micro = (float.fract() * 1_000_000_f64).round() as u32;
Self::from_timestamp_with_config(float.floor() as i64, micro, config)
}
IntFloat::Err => Err(e),
},
}
}
/// Like `from_timestamp` but with a `TimeConfig`.
///
/// ("Unix Timestamp" means number of seconds or milliseconds since 1970-01-01)
///
/// Input must be between `-11_676_096_000` (`1600-01-01T00:00:00`) and
/// `253_402_300_799_000` (`9999-12-31T23:59:59.999999`) inclusive.
///
/// If the absolute value is > 2e10 (`20_000_000_000`) it is interpreted as being in milliseconds.
///
/// That means:
/// * `20_000_000_000` is `2603-10-11T11:33:20`
/// * `20_000_000_001` is `1970-08-20T11:33:20.001`
/// * `-20_000_000_000` gives an error - `DateTooSmall` as it would be before 1600
/// * `-20_000_000_001` is `1969-05-14T12:26:39.999`
///
/// # Arguments
///
/// * `timestamp` - timestamp in either seconds or milliseconds
/// * `timestamp_microsecond` - microseconds fraction of a second timestamp
/// * `config` - the `TimeConfig` to use
///
/// Where `timestamp` is interrupted as milliseconds and is not a whole second, the remainder is added to
/// `timestamp_microsecond`.
///
/// # Examples
///
/// ```
/// use speedate::{DateTime, TimeConfigBuilder};
///
/// let d = DateTime::from_timestamp_with_config(1_654_619_320, 123, &TimeConfigBuilder::new().build()).unwrap();
/// assert_eq!(d.to_string(), "2022-06-07T16:28:40.000123");
///
/// let d = DateTime::from_timestamp_with_config(1_654_619_320_123, 123_000, &TimeConfigBuilder::new().build()).unwrap();
/// assert_eq!(d.to_string(), "2022-06-07T16:28:40.246000");
/// ```
pub fn from_timestamp_with_config(
timestamp: i64,
timestamp_microsecond: u32,
config: &TimeConfig,
) -> Result<Self, ParseError> {
let (mut second, extra_microsecond) = Date::timestamp_watershed(timestamp)?;
let mut total_microsecond = timestamp_microsecond
.checked_add(extra_microsecond)
.ok_or(ParseError::TimeTooLarge)?;
if total_microsecond >= 1_000_000 {
second = second
.checked_add(total_microsecond as i64 / 1_000_000)
.ok_or(ParseError::TimeTooLarge)?;
total_microsecond %= 1_000_000;
}
let date = Date::from_timestamp_calc(second)?;
// rem_euclid since if `timestamp_second = -100`, we want `time_second = 86300` (e.g. `86400 - 100`)
let time_second = second.rem_euclid(86_400) as u32;
Ok(Self {
date,
time: Time::from_timestamp_with_config(time_second, total_microsecond, config)?,
})
}
/// Create a datetime from a Unix Timestamp in seconds or milliseconds
///
/// ("Unix Timestamp" means number of seconds or milliseconds since 1970-01-01)
///
/// Input must be between `-11_676_096_000` (`1600-01-01T00:00:00`) and
/// `253_402_300_799_000` (`9999-12-31T23:59:59.999999`) inclusive.
///
/// If the absolute value is > 2e10 (`20_000_000_000`) it is interpreted as being in milliseconds.
///
/// That means:
/// * `20_000_000_000` is `2603-10-11T11:33:20`
/// * `20_000_000_001` is `1970-08-20T11:33:20.001`
/// * `-20_000_000_000` gives an error - `DateTooSmall` as it would be before 1600
/// * `-20_000_000_001` is `1969-05-14T12:26:39.999`
///
/// # Arguments
///
/// * `timestamp` - timestamp in either seconds or milliseconds
/// * `timestamp_microsecond` - microseconds fraction of a second timestamp
///
/// Where `timestamp` is interrupted as milliseconds and is not a whole second, the remainder is added to
/// `timestamp_microsecond`.
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let d = DateTime::from_timestamp(1_654_619_320, 123).unwrap();
/// assert_eq!(d.to_string(), "2022-06-07T16:28:40.000123");
///
/// let d = DateTime::from_timestamp(1_654_619_320_123, 123_000).unwrap();
/// assert_eq!(d.to_string(), "2022-06-07T16:28:40.246000");
/// ```
pub fn from_timestamp(timestamp: i64, timestamp_microsecond: u32) -> Result<Self, ParseError> {
Self::from_timestamp_with_config(timestamp, timestamp_microsecond, &TimeConfigBuilder::new().build())
}
/// Create a datetime from the system time. This method uses [std::time::SystemTime] to get
/// the system time and uses it to create a [DateTime] adjusted to the specified timezone offset.
///
/// # Arguments
///
/// * `tz_offset` - timezone offset in seconds, must be less than `86_400`
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let now = DateTime::now(0).unwrap();
/// println!("Current date and time: {}", now);
/// ```
pub fn now(tz_offset: i32) -> Result<Self, ParseError> {
let t = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.map_err(|_| ParseError::SystemTimeError)?;
let mut now = Self::from_timestamp(t.as_secs() as i64, t.subsec_micros())?;
now.time.tz_offset = Some(0);
if tz_offset == 0 {
Ok(now)
} else {
now.in_timezone(tz_offset)
}
}
/// Clone the datetime and set a new timezone offset.
///
/// The returned datetime will represent a different point in time since the timezone offset is changed without
/// modifying the date and time. See [DateTime::in_timezone] for alternative behaviour.
///
/// # Arguments
///
/// * `tz_offset` - optional timezone offset in seconds, set to `None` to create a naïve datetime.
///
/// This method will return `Err(ParseError::OutOfRangeTz)` if `abs(tz_offset)` is not less than 24 hours `86_400`.
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt = DateTime::parse_str("2022-01-01T12:13:14Z").unwrap();
///
/// let dt2 = dt.with_timezone_offset(Some(-8 * 3600)).unwrap();
/// assert_eq!(dt2.to_string(), "2022-01-01T12:13:14-08:00");
/// ```
pub fn with_timezone_offset(&self, tz_offset: Option<i32>) -> Result<Self, ParseError> {
Ok(Self {
date: self.date.clone(),
time: self.time.with_timezone_offset(tz_offset)?,
})
}
/// Create a new datetime in a different timezone with date & time adjusted to represent the same moment in time.
/// See [DateTime::with_timezone_offset] for alternative behaviour.
///
/// The datetime must have a offset, otherwise a `ParseError::TzRequired` error is returned.
///
/// # Arguments
///
/// * `tz_offset` - new timezone offset in seconds.
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt_z = DateTime::parse_str("2000-01-01T15:00:00Z").unwrap();
///
/// let dt_utc_plus2 = dt_z.in_timezone(7200).unwrap();
/// assert_eq!(dt_utc_plus2.to_string(), "2000-01-01T17:00:00+02:00");
/// ```
pub fn in_timezone(&self, tz_offset: i32) -> Result<Self, ParseError> {
if tz_offset.abs() >= 24 * 3600 {
Err(ParseError::OutOfRangeTz)
} else if let Some(current_offset) = self.time.tz_offset {
let new_ts = self.timestamp() + (tz_offset - current_offset) as i64;
let mut new_dt = Self::from_timestamp(new_ts, self.time.microsecond)?;
new_dt.time.tz_offset = Some(tz_offset);
Ok(new_dt)
} else {
Err(ParseError::TzRequired)
}
}
/// Unix timestamp (seconds since epoch, 1970-01-01T00:00:00) omitting timezone offset
/// (or equivalently comparing to 1970-01-01T00:00:00 in the same timezone as self)
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt = DateTime::from_timestamp(1_654_619_320, 123).unwrap();
/// assert_eq!(dt.to_string(), "2022-06-07T16:28:40.000123");
/// assert_eq!(dt.timestamp(), 1_654_619_320);
///
/// let dt = DateTime::parse_str("1970-01-02T00:00").unwrap();
/// assert_eq!(dt.timestamp(), 24 * 3600);
/// ```
pub fn timestamp(&self) -> i64 {
self.date.timestamp() + self.time.total_seconds() as i64
}
/// Unix timestamp assuming epoch is in zulu timezone (1970-01-01T00:00:00Z) and accounting for
/// timezone offset.
///
/// This is effectively [Self::timestamp] minus [Self.time::tz_offset], see [Self::partial_cmp] for details on
/// why timezone offset is subtracted. If [Self.time::tz_offset] if `None`, this is the same as [Self::timestamp].
///
/// # Examples
///
/// ```
/// use speedate::DateTime;
///
/// let dt_naive = DateTime::parse_str("1970-01-02T00:00").unwrap();
/// assert_eq!(dt_naive.timestamp_tz(), 24 * 3600);
///
/// let dt_zulu = DateTime::parse_str("1970-01-02T00:00Z").unwrap();
/// assert_eq!(dt_zulu.timestamp_tz(), 24 * 3600);
///
/// let dt_plus_1 = DateTime::parse_str("1970-01-02T00:00+01:00").unwrap();
/// assert_eq!(dt_plus_1.timestamp_tz(), 23 * 3600);
/// ```
pub fn timestamp_tz(&self) -> i64 {
match self.time.tz_offset {
Some(tz_offset) => self.timestamp() - (tz_offset as i64),
None => self.timestamp(),
}
}
}