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

// Copyright (c) 2022, Yuri6037
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of time-tz nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use time::{OffsetDateTime, PrimitiveDateTime, UtcOffset};

pub trait TimeZone
{
    fn get_offset_utc(&self, date_time: &OffsetDateTime) -> UtcOffset;
}

pub trait OffsetDateTimeExt
{
    fn to_timezone<T: TimeZone>(&self, tz: &T) -> OffsetDateTime;
}

pub trait PrimitiveDateTimeExt
{
    fn assume_timezone<T: TimeZone>(&self, tz: &T) -> OffsetDateTime;
}

impl PrimitiveDateTimeExt for PrimitiveDateTime {
    fn assume_timezone<T: TimeZone>(&self, tz: &T) -> OffsetDateTime {
        let offset = tz.get_offset_utc(&self.assume_utc());
        self.assume_offset(offset)
    }
}

impl OffsetDateTimeExt for OffsetDateTime {
    fn to_timezone<T: TimeZone>(&self, tz: &T) -> OffsetDateTime {
        let offset = tz.get_offset_utc(self);
        self.to_offset(offset)
    }
}

mod timezone_impl;
mod timezones;
mod binary_search;

pub use timezone_impl::Tz;
pub use timezones::get;

#[cfg(test)]
mod tests {
    use crate::get;
    use time::macros::datetime;
    use crate::PrimitiveDateTimeExt;
    use crate::OffsetDateTimeExt;

    #[test]
    fn london_to_berlin() {
        let london = get("Europe/London").unwrap();
        let berlin = get("Europe/Berlin").unwrap();
        let dt = datetime!(2016-10-8 17:0:0).assume_timezone(&london);
        let converted = dt.to_timezone(&berlin);
        let expected = datetime!(2016-10-8 18:0:0).assume_timezone(&berlin);
        assert_eq!(converted, expected);
    }
}