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
use chrono::NaiveDate;
use chrono::NaiveDateTime;
use chrono::format::ParseError;
pub const NAIVE_DATE_STRING_FORMAT : &str = "%Y-%m-%d";
pub fn date_to_string(ndt: NaiveDate) -> String {
ndt.format(NAIVE_DATE_STRING_FORMAT).to_string()
}
pub fn date_from_string<S>(s: S) -> Result<NaiveDate, ParseError>
where S: AsRef<str>
{
NaiveDate::parse_from_str(s.as_ref(), NAIVE_DATE_STRING_FORMAT)
}
pub const NAIVE_DATETIME_STRING_FORMAT : &str = "%Y-%m-%d %H:%M:%S";
pub fn datetime_to_string(ndt: &NaiveDateTime) -> String {
ndt.format(NAIVE_DATETIME_STRING_FORMAT).to_string()
}
pub fn datetime_from_string<S>(s: S) -> Result<NaiveDateTime, ParseError>
where S: AsRef<str>
{
NaiveDateTime::parse_from_str(s.as_ref(), NAIVE_DATETIME_STRING_FORMAT)
}
pub fn try_to_parse_datetime_from_string<S, Formats, Format>(s: S, fmts: Formats) -> Option<NaiveDateTime>
where S: AsRef<str>,
Formats: Iterator<Item = Format>,
Format: AsRef<str>
{
fmts.fold(None, |a, f| a.or_else(|| NaiveDateTime::parse_from_str(s.as_ref(), f.as_ref()).ok()))
}
#[test]
fn test_try_to_parse_datetime_from_string() {
let formats = vec![
"%Y%m%dT%H%M%S",
"%Y%m%dT%H%M%SZ"
];
let text = "20190730T160527Z";
assert!(try_to_parse_datetime_from_string(text, formats.iter()).is_some())
}