time 0.3.47

Date and time library. Fully interoperable with the standard library. Mostly compatible with #![no_std].
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

//! Helpers for implementing formatting for ISO 8601.

use std::io;

use crate::convert::*;
use crate::error;
use crate::format_description::well_known::Iso8601;
use crate::format_description::well_known::iso8601::{
    DateKind, EncodedConfig, OffsetPrecision, TimePrecision,
};
use crate::formatting::{
    ComponentProvider, format_float, format_number_pad_zero, write, write_if, write_if_else,
};

/// Format the date portion of ISO 8601.
pub(super) fn format_date<V, const CONFIG: EncodedConfig>(
    output: &mut (impl io::Write + ?Sized),
    value: &V,
    state: &mut V::State,
) -> Result<usize, error::Format>
where
    V: ComponentProvider,
{
    let mut bytes = 0;

    match Iso8601::<CONFIG>::DATE_KIND {
        DateKind::Calendar => {
            let year = value.calendar_year(state);

            if Iso8601::<CONFIG>::YEAR_IS_SIX_DIGITS {
                bytes += write_if_else(output, year < 0, b"-", b"+")?;
                bytes += format_number_pad_zero::<6>(output, year.unsigned_abs())?;
            } else if !(0..=9999).contains(&year) {
                return Err(error::Format::InvalidComponent("year"));
            } else {
                bytes += format_number_pad_zero::<4>(output, year.cast_unsigned())?;
            }
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b"-")?;
            bytes += format_number_pad_zero::<2>(output, u8::from(value.month(state)))?;
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b"-")?;
            bytes += format_number_pad_zero::<2>(output, value.day(state))?;
        }
        DateKind::Week => {
            let year = value.iso_year(state);

            if Iso8601::<CONFIG>::YEAR_IS_SIX_DIGITS {
                bytes += write_if_else(output, year < 0, b"-", b"+")?;
                bytes += format_number_pad_zero::<6>(output, year.unsigned_abs())?;
            } else if !(0..=9999).contains(&year) {
                return Err(error::Format::InvalidComponent("year"));
            } else {
                bytes += format_number_pad_zero::<4>(output, year.cast_unsigned())?;
            }
            bytes += write_if_else(output, Iso8601::<CONFIG>::USE_SEPARATORS, b"-W", b"W")?;
            bytes += format_number_pad_zero::<2>(output, value.iso_week_number(state))?;
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b"-")?;
            bytes +=
                format_number_pad_zero::<1>(output, value.weekday(state).number_from_monday())?;
        }
        DateKind::Ordinal => {
            let year = value.calendar_year(state);

            if Iso8601::<CONFIG>::YEAR_IS_SIX_DIGITS {
                bytes += write_if_else(output, year < 0, b"-", b"+")?;
                bytes += format_number_pad_zero::<6>(output, year.unsigned_abs())?;
            } else if !(0..=9999).contains(&year) {
                return Err(error::Format::InvalidComponent("year"));
            } else {
                bytes += format_number_pad_zero::<4>(output, year.cast_unsigned())?;
            }
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b"-")?;
            bytes += format_number_pad_zero::<3>(output, value.ordinal(state))?;
        }
    }

    Ok(bytes)
}

/// Format the time portion of ISO 8601.
#[inline]
pub(super) fn format_time<V, const CONFIG: EncodedConfig>(
    output: &mut (impl io::Write + ?Sized),
    value: &V,
    state: &mut V::State,
) -> Result<usize, error::Format>
where
    V: ComponentProvider,
{
    let mut bytes = 0;

    // The "T" can only be omitted in extended format where there is no date being formatted.
    bytes += write_if(
        output,
        Iso8601::<CONFIG>::USE_SEPARATORS || Iso8601::<CONFIG>::FORMAT_DATE,
        b"T",
    )?;

    match Iso8601::<CONFIG>::TIME_PRECISION {
        TimePrecision::Hour { decimal_digits } => {
            let hours = (value.hour(state) as f64)
                + (value.minute(state) as f64) / Minute::per_t::<f64>(Hour)
                + (value.second(state) as f64) / Second::per_t::<f64>(Hour)
                + (value.nanosecond(state) as f64) / Nanosecond::per_t::<f64>(Hour);
            format_float(output, hours, 2, decimal_digits)?;
        }
        TimePrecision::Minute { decimal_digits } => {
            bytes += format_number_pad_zero::<2>(output, value.hour(state))?;
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b":")?;
            let minutes = (value.minute(state) as f64)
                + (value.second(state) as f64) / Second::per_t::<f64>(Minute)
                + (value.nanosecond(state) as f64) / Nanosecond::per_t::<f64>(Minute);
            bytes += format_float(output, minutes, 2, decimal_digits)?;
        }
        TimePrecision::Second { decimal_digits } => {
            bytes += format_number_pad_zero::<2>(output, value.hour(state))?;
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b":")?;
            bytes += format_number_pad_zero::<2>(output, value.minute(state))?;
            bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b":")?;
            let seconds = (value.second(state) as f64)
                + (value.nanosecond(state) as f64) / Nanosecond::per_t::<f64>(Second);
            bytes += format_float(output, seconds, 2, decimal_digits)?;
        }
    }

    Ok(bytes)
}

/// Format the UTC offset portion of ISO 8601.
#[inline]
pub(super) fn format_offset<V, const CONFIG: EncodedConfig>(
    output: &mut (impl io::Write + ?Sized),
    value: &V,
    state: &mut V::State,
) -> Result<usize, error::Format>
where
    V: ComponentProvider,
{
    if Iso8601::<CONFIG>::FORMAT_TIME && value.offset_is_utc(state) {
        return Ok(write(output, b"Z")?);
    }

    let mut bytes = 0;

    if value.offset_second(state) != 0 {
        return Err(error::Format::InvalidComponent("offset_second"));
    }
    bytes += write_if_else(output, value.offset_is_negative(state), b"-", b"+")?;
    bytes += format_number_pad_zero::<2>(output, value.offset_hour(state).unsigned_abs())?;

    let minutes = value.offset_minute(state);

    if Iso8601::<CONFIG>::OFFSET_PRECISION == OffsetPrecision::Hour && minutes != 0 {
        return Err(error::Format::InvalidComponent("offset_minute"));
    } else if Iso8601::<CONFIG>::OFFSET_PRECISION == OffsetPrecision::Minute {
        bytes += write_if(output, Iso8601::<CONFIG>::USE_SEPARATORS, b":")?;
        bytes += format_number_pad_zero::<2>(output, minutes.unsigned_abs())?;
    }

    Ok(bytes)
}