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//! Date formatting
const int = @import("int.zig");
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 MONTH_NAMES = [_][]const u8{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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 format(timestamp: u64, buf: []u8) []u8 {
if (timestamp == 0) {
const default = "01 Jan 1970 00:00";
for (default, 0..) |c, i| {
buf[i] = c;
}
return buf[0..default.len];
}
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;
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: usize = 0;
var day: u64 = remaining_days + 1;
for (days_in_months, 0..) |days, m| {
if (day <= days) {
month = m;
break;
}
day -= days;
}
var pos: usize = 0;
if (day < 10) {
buf[pos] = '0';
pos += 1;
}
const day_str = int.toStr(day, buf[pos..]);
pos += day_str.len;
buf[pos] = ' ';
pos += 1;
for (MONTH_NAMES[month]) |c| {
buf[pos] = c;
pos += 1;
}
buf[pos] = ' ';
pos += 1;
const year_str = int.toStr(year, buf[pos..]);
pos += year_str.len;
buf[pos] = ' ';
pos += 1;
if (hours < 10) {
buf[pos] = '0';
pos += 1;
}
const hour_str = int.toStr(hours, buf[pos..]);
pos += hour_str.len;
buf[pos] = ':';
pos += 1;
if (minutes < 10) {
buf[pos] = '0';
pos += 1;
}
const min_str = int.toStr(minutes, buf[pos..]);
pos += min_str.len;
return buf[0..pos];
}
fn isLeapYear(year: u64) bool {
return (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0);
}
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