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// Copyright 2026 The Casdoor Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::time::{SystemTime, UNIX_EPOCH};
/// Get the current time in RFC 3339 format (UTC), e.g. `2026-01-02T15:04:05Z`, which is the
/// format Casdoor uses for fields like `created_time`.
pub fn get_current_time() -> String {
let secs = SystemTime::now()
.duration_since(UNIX_EPOCH)
.map(|duration| duration.as_secs() as i64)
.unwrap_or_default();
format_rfc3339(secs)
}
fn format_rfc3339(secs: i64) -> String {
let days = secs.div_euclid(86400);
let secs_of_day = secs.rem_euclid(86400);
let (year, month, day) = civil_from_days(days);
format!(
"{year:04}-{month:02}-{day:02}T{:02}:{:02}:{:02}Z",
secs_of_day / 3600,
secs_of_day % 3600 / 60,
secs_of_day % 60
)
}
// Converts days since 1970-01-01 to a (year, month, day) date, see
// https://howardhinnant.github.io/date_algorithms.html#civil_from_days
fn civil_from_days(days: i64) -> (i64, i64, i64) {
let z = days + 719468;
let era = z.div_euclid(146097);
let doe = z.rem_euclid(146097);
let yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
let doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
let mp = (5 * doy + 2) / 153;
let day = doy - (153 * mp + 2) / 5 + 1;
let month = if mp < 10 { mp + 3 } else { mp - 9 };
let year = yoe + era * 400 + i64::from(month <= 2);
(year, month, day)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_format_rfc3339() {
assert_eq!(format_rfc3339(0), "1970-01-01T00:00:00Z");
assert_eq!(format_rfc3339(951782400), "2000-02-29T00:00:00Z");
assert_eq!(format_rfc3339(1767366245), "2026-01-02T15:04:05Z");
}
}