MoonBit date-time formatting: epoch-milliseconds to ISO 8601 and RFC 5322 timestamps, UTC only

date

time

iso8601

rfc5322

timestamp

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Author

chensuiyi

Version

0.3.0

License

MIT

Repository

github.com/chenbimo/moonbit

Last updated

7 hours ago

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#chensuiyi/dateku

Epoch-millisecond timestamps for MoonBit: ISO 8601 / RFC 5322 formatting, UTC component access, construction, shifts, and calendar queries. UTC only.

#Install

moon add chensuiyi/dateku

#Features

iso8601 / rfc5322: civil-from-days algorithm; leap-century rules and millisecond boundaries tested
Components: year / month / day / hour / minute / second / millisecond
make_epoch: construct from UTC parts; out-of-range components roll over; the exact inverse of iso8601
Shifts: add_days / add_hours / add_minutes / add_seconds (negative shifts backwards)
Day queries: start_of_day / is_same_day; calendar: is_leap_year / days_in_month
Deliberately out of scope: timezones, localization, parsing

#Scenarios

Log line timestamps (ISO 8601)
Email Date headers (RFC 5322)
Status lines and TTL windows: shift by hours/days, test same-day

#API

Function	Description
now_ms()	Current epoch milliseconds
now_unix()	Current epoch seconds
iso8601(epoch_ms)	2026-10-03T08:15:30.123Z
rfc5322(epoch_ms)	Sat, 03 Oct 2026 08:15:30 +0000
year(epoch_ms)	UTC year
month(epoch_ms)	UTC month, 1-12
day(epoch_ms)	UTC day of month, 1-31
hour(epoch_ms)	UTC hour, 0-23
minute(epoch_ms)	UTC minute, 0-59
second(epoch_ms)	UTC second, 0-59
millisecond(epoch_ms)	UTC millisecond, 0-999
make_epoch(y, m, d, ...)	Construct epoch ms; parts roll over
is_leap_year(y)	Gregorian leap year
days_in_month(y, m)	28-31, 0 for invalid month
add_days / add_hours / add_minutes / add_seconds(e, n)	Shift, negative = backwards
start_of_day(e)	UTC midnight of that day
is_same_day(a, b)	Same UTC day

@dateku.iso8601(1791015330123UL)   // "2026-10-03T08:15:30.123Z"
@dateku.rfc5322(1791015330000UL)   // "Sat, 03 Oct 2026 08:15:30 +0000"

// Components
let e = @dateku.make_epoch(2026, 10, 3, hour=8, minute=15, second=30)
@dateku.year(e)     // 2026
@dateku.hour(e)     // 8

// Shifts and day queries
let tomorrow = @dateku.add_days(e, 1)
@dateku.is_same_day(e, tomorrow)              // false
@dateku.start_of_day(e) == @dateku.make_epoch(2026, 10, 3)  // true

// Calendar
@dateku.is_leap_year(2024)        // true
@dateku.days_in_month(2026, 2)    // 28

#Author

陈随易 (@chenbimo) · mooncakes: chensuiyi

#License

MIT

#chensuiyi/dateku

MoonBit 时间戳库:ISO 8601 / RFC 5322 格式化、UTC 分量读取、构造、平移与日历查询,仅 UTC。

#安装

moon add chensuiyi/dateku

#功能

iso8601 / rfc5322:civil-from-days 算法,闰世纪规则与毫秒边界均有测试
分量读取:year / month / day / hour / minute / second / millisecond
make_epoch:按 UTC 分量构造,越界分量自然进位;与 iso8601 精确互逆
平移:add_days / add_hours / add_minutes / add_seconds(负数回退)
日查询:start_of_day / is_same_day;日历:is_leap_year / days_in_month
刻意不做:时区、本地化、解析

#场景

日志行时间戳(ISO 8601)
邮件 Date 头(RFC 5322)
状态行与 TTL 窗口:按时/天平移、同日判定

#API

函数	说明
now_ms()	当前 epoch 毫秒
now_unix()	当前 epoch 秒
iso8601(epoch_ms)	2026-10-03T08:15:30.123Z
rfc5322(epoch_ms)	Sat, 03 Oct 2026 08:15:30 +0000
year(epoch_ms)	UTC 年
month(epoch_ms)	UTC 月,1-12
day(epoch_ms)	UTC 日,1-31
hour(epoch_ms)	UTC 时,0-23
minute(epoch_ms)	UTC 分,0-59
second(epoch_ms)	UTC 秒,0-59
millisecond(epoch_ms)	UTC 毫秒,0-999
make_epoch(y, m, d, ...)	构造 epoch 毫秒,分量越界进位
is_leap_year(y)	格里高利闰年
days_in_month(y, m)	28-31,月份非法返回 0
add_days / add_hours / add_minutes / add_seconds(e, n)	平移,负数回退
start_of_day(e)	当日 UTC 零点
is_same_day(a, b)	同一 UTC 日

#用法示例

@dateku.iso8601(1791015330123UL)   // "2026-10-03T08:15:30.123Z"
@dateku.rfc5322(1791015330000UL)   // "Sat, 03 Oct 2026 08:15:30 +0000"

// 分量读取
let e = @dateku.make_epoch(2026, 10, 3, hour=8, minute=15, second=30)
@dateku.year(e)     // 2026
@dateku.hour(e)     // 8

// 平移与日查询
let tomorrow = @dateku.add_days(e, 1)
@dateku.is_same_day(e, tomorrow)              // false
@dateku.start_of_day(e) == @dateku.make_epoch(2026, 10, 3)  // true

// 日历
@dateku.is_leap_year(2024)        // true
@dateku.days_in_month(2026, 2)    // 28

#作者

陈随易 (@chenbimo)

#协议

MIT

add_days

source

fn add_days(epoch_ms : UInt64, days : Int) -> UInt64

Shift epoch_ms by a number of days (negative shifts backwards).

add_hours

source

fn add_hours(epoch_ms : UInt64, hours : Int) -> UInt64

Shift epoch_ms by a number of hours (negative shifts backwards).

add_minutes

source

fn add_minutes(epoch_ms : UInt64, minutes : Int) -> UInt64

Shift epoch_ms by a number of minutes (negative shifts backwards).

add_seconds

source

fn add_seconds(epoch_ms : UInt64, seconds : Int) -> UInt64

Shift epoch_ms by a number of seconds (negative shifts backwards).

day

source

fn day(epoch_ms : UInt64) -> Int

UTC day of month of epoch_ms, 1-31.

days_in_month

source

fn days_in_month(year : Int, month : Int) -> Int

Number of days in the given UTC month, 0 for an invalid month.

hour

source

fn hour(epoch_ms : UInt64) -> Int

UTC hour of epoch_ms, 0-23.

is_leap_year

source

fn is_leap_year(year : Int) -> Bool

Gregorian leap-year rule.

is_same_day

source

fn is_same_day(a : UInt64, b : UInt64) -> Bool

True when both instants fall on the same UTC day.

iso8601

source

fn iso8601(epoch_ms : UInt64) -> String

Format epoch milliseconds as an ISO 8601 UTC timestamp: 2026-10-03T08:15:30.123Z.

make_epoch

source

fn make_epoch(year : Int, month : Int, day : Int, hour? : Int, minute? : Int, second? : Int, millisecond? : Int) -> UInt64

Construct epoch milliseconds from UTC components. Out-of-range components roll over naturally (like make_epoch(2026, 13, 1) being January of the next year).

millisecond

source

fn millisecond(epoch_ms : UInt64) -> Int

UTC millisecond of epoch_ms, 0-999.

minute

source

fn minute(epoch_ms : UInt64) -> Int

UTC minute of epoch_ms, 0-59.

month

source

fn month(epoch_ms : UInt64) -> Int

UTC month of epoch_ms, 1-12.

now_ms

source

fn now_ms() -> UInt64

Current wall-clock time in epoch milliseconds.

now_unix

source

fn now_unix() -> UInt64

Current Unix time in whole seconds.

rfc5322

source

fn rfc5322(epoch_ms : UInt64) -> String

Format epoch milliseconds as an RFC 5322 date-time header: Sat, 03 Oct 2026 08:15:30 +0000. Email needs the weekday and month names spelled out, which the ISO timestamp does not carry.

second

source

fn second(epoch_ms : UInt64) -> Int

UTC second of epoch_ms, 0-59.

start_of_day

source

fn start_of_day(epoch_ms : UInt64) -> UInt64

Epoch milliseconds of UTC midnight for the day of epoch_ms.

year

source

fn year(epoch_ms : UInt64) -> Int

UTC year of epoch_ms.

Source Files

dateku.mbt

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dateku

#chensuiyi/dateku

#Install

#Features

#Scenarios

#API

#Author

#License

#chensuiyi/dateku

#安装

#功能

#场景

#API

#用法示例

#作者

#协议

#add_days

#add_hours

#add_minutes

#add_seconds

#day

#days_in_month

#hour

#is_leap_year

#is_same_day

#iso8601

#make_epoch

#millisecond

#minute

#month

#now_ms

#now_unix

#rfc5322

#second

#start_of_day

#year

Source Files

add_days

add_hours

add_minutes

add_seconds

day

days_in_month

hour

is_leap_year

is_same_day

iso8601

make_epoch

millisecond

minute

month

now_ms

now_unix

rfc5322

second

start_of_day

year