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//! Time operations
const sys = @import("sys");
const types = @import("types.zig");
const ERROR_RESULT: u64 = @bitCast(@as(i64, -1));
const SECONDS_PER_DAY: u64 = 86400;
const SECONDS_PER_HOUR: u64 = 3600;
const SECONDS_PER_MINUTE: u64 = 60;
const DAYS_PER_4_YEARS: u64 = 1461;
const DAYS_NORMAL = [_]u64{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
const DAYS_LEAP = [_]u64{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
pub fn now() ?u64 {
const result = sys.syscall(.gettime, .{});
if (result == ERROR_RESULT) {
return null;
}
return result;
}
pub fn parts(timestamp: u64) types.DateTime {
const days_since_epoch = timestamp / SECONDS_PER_DAY;
const seconds_today = timestamp % SECONDS_PER_DAY;
const hours = seconds_today / SECONDS_PER_HOUR;
const minutes = (seconds_today % SECONDS_PER_HOUR) / SECONDS_PER_MINUTE;
const seconds = seconds_today % SECONDS_PER_MINUTE;
var year: u64 = 1970;
var remaining_days = days_since_epoch;
const four_year_cycles = remaining_days / DAYS_PER_4_YEARS;
year += four_year_cycles * 4;
remaining_days = remaining_days % DAYS_PER_4_YEARS;
while (remaining_days >= 365) {
const is_leap = isLeapYear(year);
const days_this_year: u64 = if (is_leap) 366 else 365;
if (remaining_days >= days_this_year) {
remaining_days -= days_this_year;
year += 1;
} else {
break;
}
}
const is_leap = isLeapYear(year);
const days_in_months = if (is_leap) DAYS_LEAP else DAYS_NORMAL;
var month: u8 = 1;
var day: u64 = remaining_days + 1;
for (days_in_months, 0..) |days, m| {
if (day <= days) {
month = @intCast(m + 1);
break;
}
day -= days;
}
return types.DateTime{
.year = year,
.month = month,
.day = @intCast(day),
.hour = @intCast(hours),
.minute = @intCast(minutes),
.second = @intCast(seconds),
};
}
fn isLeapYear(year: u64) bool {
return (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0);
}
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