1 // Copyright 2015-2016 Brian Smith.
2 //
3 // Permission to use, copy, modify, and/or distribute this software for any
4 // purpose with or without fee is hereby granted, provided that the above
5 // copyright notice and this permission notice appear in all copies.
6 //
7 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
8 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
10 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
12 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
13 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15 use super::{time::Time, Error};
16
time_from_ymdhms_utc( year: u64, month: u64, day_of_month: u64, hours: u64, minutes: u64, seconds: u64, ) -> Result<Time, Error>17 pub fn time_from_ymdhms_utc(
18 year: u64,
19 month: u64,
20 day_of_month: u64,
21 hours: u64,
22 minutes: u64,
23 seconds: u64,
24 ) -> Result<Time, Error> {
25 let days_before_year_since_unix_epoch = days_before_year_since_unix_epoch(year)?;
26
27 const JAN: u64 = 31;
28 let feb = days_in_feb(year);
29 const MAR: u64 = 31;
30 const APR: u64 = 30;
31 const MAY: u64 = 31;
32 const JUN: u64 = 30;
33 const JUL: u64 = 31;
34 const AUG: u64 = 31;
35 const SEP: u64 = 30;
36 const OCT: u64 = 31;
37 const NOV: u64 = 30;
38 let days_before_month_in_year = match month {
39 1 => 0,
40 2 => JAN,
41 3 => JAN + feb,
42 4 => JAN + feb + MAR,
43 5 => JAN + feb + MAR + APR,
44 6 => JAN + feb + MAR + APR + MAY,
45 7 => JAN + feb + MAR + APR + MAY + JUN,
46 8 => JAN + feb + MAR + APR + MAY + JUN + JUL,
47 9 => JAN + feb + MAR + APR + MAY + JUN + JUL + AUG,
48 10 => JAN + feb + MAR + APR + MAY + JUN + JUL + AUG + SEP,
49 11 => JAN + feb + MAR + APR + MAY + JUN + JUL + AUG + SEP + OCT,
50 12 => JAN + feb + MAR + APR + MAY + JUN + JUL + AUG + SEP + OCT + NOV,
51 _ => unreachable!(), // `read_two_digits` already bounds-checked it.
52 };
53
54 let days_before =
55 days_before_year_since_unix_epoch + days_before_month_in_year + day_of_month - 1;
56
57 let seconds_since_unix_epoch =
58 (days_before * 24 * 60 * 60) + (hours * 60 * 60) + (minutes * 60) + seconds;
59
60 Ok(Time::from_seconds_since_unix_epoch(
61 seconds_since_unix_epoch,
62 ))
63 }
64
days_before_year_since_unix_epoch(year: u64) -> Result<u64, Error>65 fn days_before_year_since_unix_epoch(year: u64) -> Result<u64, Error> {
66 // We don't support dates before January 1, 1970 because that is the
67 // Unix epoch. It is likely that other software won't deal well with
68 // certificates that have dates before the epoch.
69 if year < 1970 {
70 return Err(Error::BadDerTime);
71 }
72 let days_before_year_ad = days_before_year_ad(year);
73 debug_assert!(days_before_year_ad >= DAYS_BEFORE_UNIX_EPOCH_AD);
74 Ok(days_before_year_ad - DAYS_BEFORE_UNIX_EPOCH_AD)
75 }
76
days_before_year_ad(year: u64) -> u6477 fn days_before_year_ad(year: u64) -> u64 {
78 ((year - 1) * 365)
79 + ((year - 1) / 4) // leap years are every 4 years,
80 - ((year - 1) / 100) // except years divisible by 100,
81 + ((year - 1) / 400) // except years divisible by 400.
82 }
83
days_in_month(year: u64, month: u64) -> u6484 pub fn days_in_month(year: u64, month: u64) -> u64 {
85 match month {
86 1 | 3 | 5 | 7 | 8 | 10 | 12 => 31,
87 4 | 6 | 9 | 11 => 30,
88 2 => days_in_feb(year),
89 _ => unreachable!(), // `read_two_digits` already bounds-checked it.
90 }
91 }
92
days_in_feb(year: u64) -> u6493 fn days_in_feb(year: u64) -> u64 {
94 if (year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)) {
95 29
96 } else {
97 28
98 }
99 }
100
101 #[allow(clippy::unreadable_literal)] // TODO: Make this clear.
102 const DAYS_BEFORE_UNIX_EPOCH_AD: u64 = 719162;
103
104 #[cfg(test)]
105 mod tests {
106 #[test]
test_days_before_unix_epoch()107 fn test_days_before_unix_epoch() {
108 use super::{days_before_year_ad, DAYS_BEFORE_UNIX_EPOCH_AD};
109 assert_eq!(DAYS_BEFORE_UNIX_EPOCH_AD, days_before_year_ad(1970));
110 }
111
112 #[test]
test_days_in_month()113 fn test_days_in_month() {
114 use super::days_in_month;
115 assert_eq!(days_in_month(2017, 1), 31);
116 assert_eq!(days_in_month(2017, 2), 28);
117 assert_eq!(days_in_month(2017, 3), 31);
118 assert_eq!(days_in_month(2017, 4), 30);
119 assert_eq!(days_in_month(2017, 5), 31);
120 assert_eq!(days_in_month(2017, 6), 30);
121 assert_eq!(days_in_month(2017, 7), 31);
122 assert_eq!(days_in_month(2017, 8), 31);
123 assert_eq!(days_in_month(2017, 9), 30);
124 assert_eq!(days_in_month(2017, 10), 31);
125 assert_eq!(days_in_month(2017, 11), 30);
126 assert_eq!(days_in_month(2017, 12), 31);
127
128 // leap cases
129 assert_eq!(days_in_month(2000, 2), 29);
130 assert_eq!(days_in_month(2004, 2), 29);
131 assert_eq!(days_in_month(2016, 2), 29);
132 assert_eq!(days_in_month(2100, 2), 28);
133 }
134
135 #[allow(clippy::unreadable_literal)] // TODO: Make this clear.
136 #[test]
test_time_from_ymdhms_utc()137 fn test_time_from_ymdhms_utc() {
138 use super::{time_from_ymdhms_utc, Time};
139
140 // year boundary
141 assert_eq!(
142 Time::from_seconds_since_unix_epoch(1483228799),
143 time_from_ymdhms_utc(2016, 12, 31, 23, 59, 59).unwrap()
144 );
145 assert_eq!(
146 Time::from_seconds_since_unix_epoch(1483228800),
147 time_from_ymdhms_utc(2017, 1, 1, 0, 0, 0).unwrap()
148 );
149
150 // not a leap year
151 assert_eq!(
152 Time::from_seconds_since_unix_epoch(1492449162),
153 time_from_ymdhms_utc(2017, 4, 17, 17, 12, 42).unwrap()
154 );
155
156 // leap year, post-feb
157 assert_eq!(
158 Time::from_seconds_since_unix_epoch(1460913162),
159 time_from_ymdhms_utc(2016, 4, 17, 17, 12, 42).unwrap()
160 );
161 }
162 }
163