8 files changed, 737 insertions, 8 deletions
diff --git a/content/about/contact.md b/content/about/contact.md
index f4312fa..23686d5 100644
--- a/content/about/contact.md
+++ b/content/about/contact.md
@@ -12,6 +12,10 @@ work, contact my [professional email][work-mail].  If you are or want to be a
 friend, contact my [personal email][perso-mail].  If in doubt, use the first
 one.
 
+**WARNING**: As of 2025-04-20, loang.net's mail server is *not* working properly.
+I can receive, but not send email from there.
+Please direct your email to the disroot one instead.
+
 [work-mail]: mailto:huyngo@disroot.org
 [perso-mail]: mailto:xarvos@loang.net
 
diff --git a/content/about/rss.md b/content/about/rss.md
index 7633059..1246751 100644
--- a/content/about/rss.md
+++ b/content/about/rss.md
@@ -22,13 +22,6 @@ feeds here:
 - [German](/de/posts/index.xml)
 - [Vietnamese](/vi/posts/index.xml)
 
-## TIL (Today I learned)
-
-- [English](/en/til/index.xml)
-- [French](/fr/til/index.xml)
-- [German](/de/til/index.xml)
-- [Vietnamese](/vi/til/index.xml)
-
 ## Book reviews
 
 - [English](/en/book-reviews/index.xml)
diff --git a/content/book-reviews/tous-les-hommes-sont-mortels.fr.md b/content/book-reviews/tous-les-hommes-sont-mortels.fr.md
new file mode 100644
index 0000000..1ccf02e
--- /dev/null
+++ b/content/book-reviews/tous-les-hommes-sont-mortels.fr.md
@@ -0,0 +1,55 @@
+---
+categories: ["book review"]
+title: "Tous les hommes sont mortels"
+date: 2025-02-08
+tags: [existentialisme]
+isbn: 9782700232707
+book: "Tous les hommes sont mortels"
+authors:
+  - Simone de Beauvoir
+genres:
+  - philosophie
+lang: fr
+layout: books
+---
+
+## Commentaires
+
+J'ai lit ce livre avec si beaucoup de pauses longues que je le trouve difficile
+à se souvenir tous les détails.  Ce n'est pas qu'il est trop difficile à lire
+ou ennuyeux, c'était toute ma faute.  En tout cas, c'est un livre qui pose des
+questions intéressantes des conditions humaines, la vie et la mort, et surtout
+dans une manière approchable.  En voyant l'ennui de l'homme qui abandonna le
+monde des mortels, on trouve notre voie, on apprend qu'est-ce que c'est un
+homme mortel.
+
+## Sommaire (spoiler)
+
+C'est des histoires de Fosca Raymond, qui fut né au 15e siècle.  Comme un des
+dirigeants, il chercha le pouvoir, et il accepta un offre de l'immortalité,
+qui, selon lui au moment, lui donna la chance de gagner contre ses ennemis.
+Mais il expériença bientôt la première malédiction de l'immortalité : la mort
+de ceux qu'il aime.  Quoi qu'il fasse, il ne puisse pas les sauver de leur
+destin.  Ils moururent de la plague, dans la guèrre, ou de vieillesse.
+C'est pire, ceux qu'il aimait, ils le déteste.  Ils le déteste pour saisir
+d'eux leurs choix, leur liberté.  Il pensa qu'il les protégeait de la mort,
+mais comme résultat il ne les laissait vivre.
+
+Un peu siècles plus tard, Fosca accepta le fait qu'il ne peux pas vaincre le
+monde malgré son immortalité.  Il essaya rentre parmi les mortels.  Et il
+réalisa qu'il ne le puisse plus faire : il n'était plus un homme.  Un homme vit
+et meurt.  Lui, il ne fasse ni les deux.  Il ne puisse plus percevoir le monde
+comme un homme, il ne puisse plus comprendre ce que les autres voulurent, et il
+est tout seul parmi les mortels.
+
+Il ne voyait pas pourquoi les hommes luttait.  Ils ne achevera jamais l'idéal.
+Et quand on gagne, on va simplement exiger pour de plus.  Mais c'est être un
+homme mortel : on lutte pour le présent.  Pour toujours, on est vainqueurs;
+demain, on continuera lutter.
+
+Régine le rencontra et elle voulait l'aimer et être aimée par lui.  Elle rêvait
+de vivre pour toujours dans son mémoir.  Mais elle n'était pas sa première.
+Fosca a aimé une femme, Marianne, si beaucoup il essayait de conserver sa
+mémoir à l'avenir.  Mais elle était dans le passé.  Elle ne vit dans le
+présent.  Il ne peut pas la prendre avec lui.  Elle va enfin s'évanouir dans le
+passé.
diff --git a/content/cal/_index.html b/content/cal/_index.html
new file mode 100644
index 0000000..9bbb4fd
--- /dev/null
+++ b/content/cal/_index.html
@@ -0,0 +1,68 @@
+---
+title: Calendar
+disable_feed: true
+---
+
+<noscript>
+	This calendar works locally in your browser and requires JavaScript to remain serverless
+</noscript>
+<div>
+	<label>
+		Solar date:
+		<input id="solar-date" type="date" />
+	</label>
+	<button id="nav-today">Today</button>
+</div>
+<div id="lunar-solar-cal">
+	<div id="solar-cal">
+		<div id="month-year-row">
+			<div id="solar-month-vi" lang=vi></div>
+			<div id="solar-year"></div>
+			<div id="solar-month-en"></div>
+		</div>
+		<hr>
+		<div id="day-area" lang=vi>
+			<button id="nav-day-before">
+				<span class="sr-only">Ngày trước</span>
+			</button>
+			<div>
+				<div id="solar-day"></div>
+				<div id="special-day-vi"></div>
+			</div>
+			<button id="nav-day-after">
+				<span class="sr-only">Ngày tiếp theo</span>
+			</button>
+		</div>
+		<hr>
+		<div id="weekday-row">
+			<div id="solar-weekday-en"></div>
+			<div id="solar-weekday-vi" lang=vi></div>
+			<div id="solar-weekday-zh" lang=zh></div>
+		</div>
+	</div>
+	<hr>
+	<div id="lunar-cal">
+		<div id=lunar-cal-vi lang="vi">
+			<div id="lunar-year-vi"></div>
+			<div id="lunar-month-vi"></div>
+			<div id="lunar-month-zodiac-vi"></div>
+			<div id="lunar-day-zodiac-vi"></div>
+			<div id="solar-term-vi"></div>
+		</div>
+		<div id="lunar-day"></div>
+		<div id=lunar-cal-zh lang="zh">
+			<div id="lunar-year-zh"></div>
+			<div>
+				<span id="lunar-month-zh"></span> ·
+				<span id="lunar-month-zodiac-zh"></span>
+			</div>
+			<div id="lunar-day-zh"></div>
+			<div id="lunar-day-zodiac-zh"></div>
+			<div>
+				<span id="solar-term-zh"></span>
+				<span id="special-day-zh"></span>
+			</div>
+		</div>
+	</div>
+</div>
+<script src="lunar.js"></script>
diff --git a/content/cal/lunar.js b/content/cal/lunar.js
new file mode 100644
index 0000000..4ab5e26
--- /dev/null
+++ b/content/cal/lunar.js
@@ -0,0 +1,522 @@
+// Part 1: Converter functions
+
+// Sin function with degree instead of radian
+function sind(degree) {
+	return Math.sin(degree * Math.PI / 180)
+}
+
+// Convert Gregorian date to Julian day
+function getJulianDay(date) {
+	const year = date.getFullYear()
+	const month = date.getMonth() + 1
+	const day = date.getDate()
+
+	let a = parseInt((14 - month) / 12)
+	let y = year + 4800 - a
+	y = y * 365 + parseInt(y / 4) - parseInt(y / 100) + parseInt(y / 400)
+	let m = month + 12 * a - 3
+	return parseInt(day + (153 * m + 2) / 5) + y - 32045
+}
+
+// Convert Julian day to Gregorian date
+function getDateFromJulianDay(jd) {
+	const a = jd + 32044
+	const b = parseInt((4 * a + 3) / 146097)
+	const c = a - parseInt((b * 146097) / 4)
+	const d = parseInt((4 * c + 3) / 1461)
+	const e = c - parseInt((1461 * d) / 4)
+	const m = parseInt((5 * e + 2) / 153)
+	const dd = e - parseInt((153 * m + 2) / 5) + 1
+	const mm = m + 2 - 12 * parseInt(m / 10)
+	const yy = b * 100 + d - 4800 + parseInt(m / 10)
+	return new Date(yy, mm, dd)
+}
+
+// Get kth new moon day since 1900-01-01 in Julian day
+function getNewMoonDay(k, tzOffset) {
+	const t = k / 1236.85
+	const t2 = t * t
+	const t3 = t2 * t
+
+	let jd1 = 2415020.75933 + 29.53058868 * k + 0.0001178 * t2 - 0.000000155 * t3
+	jd1 += 0.00033 * sind(166.56 + 132.87 * t - 0.009173 * t2)
+
+	const m = 359.2242 + 29.10535608 * k - 0.0000333 * t2 - 0.00000347 * t3
+	const mpr = 306.0253 + 385.81691806 * k + 0.0107306 * t2 + 0.00001236 * t3
+	const f = 21.2964 + 390.67050646 * k - 0.0016528 * t2 - 0.00000239 * t3
+
+	let c1 = (0.1734 - 0.000393 * t) * sind(m) + 0.0021 * sind(2 * m)
+	c1 -= 0.4068 * sind(mpr) + 0.0161 * sind(2 * mpr)
+	c1 -= 0.0004 * sind(3 * mpr)
+	c1 += 0.0104 * sind(2 * f) - 0.0051 * sind(m + mpr)
+	c1 -= 0.0074 * sind(m - mpr) + 0.0004 * sind(2 * f + m)
+	c1 -= 0.0004 * sind(2 * f - m) - 0.0006 * sind(2 * f + mpr)
+	c1 += 0.0010 * sind(2 * f - mpr) + 0.0005 * sind(2 * mpr + m)
+
+	let dt
+	if (t < -11) {
+		dt = 0.001 + 0.000839 * t + 0.0002261 * t2 - 0.00000845 * t3 - 0.000000081 * t * t3
+	} else {
+		dt = -0.000278 + 0.000265 * t + 0.000262 * t2
+	}
+	let jdNew = jd1 + c1 - dt
+	return parseInt(jdNew + 0.5 + tzOffset / 24)
+}
+
+// Get solar term from Julian day, from 0 to 23, corresponding to Chunfen to Jingzhe.
+function getSolarTerm(jd, tzOffset) {
+	t = (jd - 2451545.5 - tzOffset / 24) / 36525
+	t2 = t * t
+	m = 357.52910 + 35999.05030 * t - 0.0001559 * t2 - 0.00000048 * t * t2
+	l0 = 280.46645 + 36000.76983 * t + 0.0003032 * t2
+	dl = (1.914600 - 0.004817 * t - 0.000014 * t2) * sind(m)
+	dl = dl + (0.019993 - 0.000101 * t) * sind(2 * m) + 0.000290 * sind(3 * m)
+	l = l0 + dl
+	l %= 360  // normalize to (0, 360)
+	return parseInt(l * 24 / 360)
+}
+
+// Get the solar longitude of the day, from 0 to 11.
+// 0 is corresponding to 0 degree to 30 degree and solar term Chunfen (spring equinox) - Guyu
+// 1 is corresponding to 30 degree to 60 degree and solar term Guyu - Xiaoman
+// 2 is corresponding to 60 degree to 90 degree and solar term Xiaoman - Xiazhi (summer solstince)
+// etc
+function getSunLongitude(jd, tzOffset) {
+	t = (jd - 2451545.5 - tzOffset / 24) / 36525
+	t2 = t * t
+	m = 357.52910 + 35999.05030 * t - 0.0001559 * t2 - 0.00000048 * t * t2
+	l0 = 280.46645 + 36000.76983 * t + 0.0003032 * t2
+	dl = (1.914600 - 0.004817 * t - 0.000014 * t2) * sind(m)
+	dl = dl + (0.019993 - 0.000101 * t) * sind(2 * m) + 0.000290 * sind(3 * m)
+	l = l0 + dl
+	l %= 360  // normalize to (0, 360 deg)
+	return parseInt(l * 12 / 360)
+}
+
+// Get Julian day for the first day of 11th lunar month of the year.
+function getMonth11(year, tzOffset) {
+	off = getJulianDay(new Date(year, 11, 31)) - 2415021
+	k = parseInt(off / 29.530588853)
+	nm = getNewMoonDay(k, tzOffset)
+	sun_long = getSunLongitude(nm, tzOffset)
+	if (sun_long >= 9) {
+		nm = getNewMoonDay(k-1, tzOffset)
+	}
+	return nm
+}
+
+// Get the leap month offset from the 11th month before it.
+//
+// a11: Julian day of the first day of the 11th month
+function getLeapMonthOffset(a11, tzOffset) {
+	k = parseInt((a11 - 2415021.076998695) / 29.530588853 + 0.5)
+	i = 1
+	arc = getSunLongitude(getNewMoonDay(k + i, tzOffset), tzOffset)
+	last = 0
+	while (arc != last && i < 14) {
+		last = arc
+		i++
+		arc = getSunLongitude(getNewMoonDay(k + i, tzOffset), tzOffset)
+	}
+	return i - 1
+}
+
+function convertSolarToLunar(date, tzOffset) {
+	const jd = getJulianDay(date)
+
+	let k = parseInt((jd - 2415021.076998695) / 29.530588853)
+	let monthStart = getNewMoonDay(k + 1, tzOffset)
+	if (monthStart > jd) {
+		monthStart = getNewMoonDay(k, tzOffset)
+	}
+	let a11 = getMonth11(date.getFullYear(), tzOffset)
+	let b11 = a11
+	let lunarYear
+	if (a11 >= monthStart) {
+		lunarYear = date.getFullYear()
+		a11 = getMonth11(lunarYear - 1, tzOffset)
+	} else {
+		lunarYear = date.getFullYear() + 1
+		b11 = getMonth11(lunarYear, tzOffset)
+	}
+	let lunarDay = jd - monthStart + 1
+	let diff = parseInt((monthStart - a11) / 29)
+	let isLeapMonth = false
+	let lunarMonth = diff + 11
+	if (b11 - a11 > 365) {
+		leapMonthDiff = getLeapMonthOffset(a11, tzOffset)
+		if (diff >= leapMonthDiff) {
+			lunarMonth = diff + 10
+			if (diff == leapMonthDiff) {
+				isLeapMonth = true
+			}
+		}
+	}
+	if (lunarMonth > 12) {
+		lunarMonth -= 12
+	}
+	if (lunarMonth >= 11 && diff < 4) {
+		lunarYear -= 1
+	}
+	return {
+		year: lunarYear,
+		month: lunarMonth,
+		day: lunarDay,
+		isLeap: isLeapMonth,
+		jd: jd
+	}
+}
+
+const CAN_VI = ['Giáp', 'Ất', 'Bính', 'Đinh', 'Mậu', 'Kỷ', 'Canh', 'Tân', 'Nhâm', 'Quý']
+const CAN_ZH = ['甲', '乙', '丙', '丁', '戊', '己', '庚', '辛', '壬', '癸']
+const CHI_VI = ['Tý', 'Sửu', 'Dần', 'Mão', 'Thìn', 'Tỵ', 'Ngọ', 'Mùi', 'Thân', 'Dậu', 'Tuất', 'Hợi']
+const CHI_ZH = ['子', '丑', '寅', '卯', '辰', '巳', '午', '未', '申', '酉', '戌', '亥']
+const TERM_VI = [
+	'Xuân phân',
+	'Thanh minh',
+	'Cốc vũ',
+	'Lập hạ',
+	'Tiểu mãn',
+	'Mang chủng',
+	'Hạ chí',
+	'Tiểu thử',
+	'Đại thử',
+	'Lập thu',
+	'Xử thử',
+	'Bạch lộ',
+	'Thu phân',
+	'Hàn lộ',
+	'Sương giáng',
+	'Lập đông',
+	'Tiểu tuyết',
+	'Đại tuyết',
+	'Đông chí',
+	'Tiểu hàn',
+	'Đại hàn',
+	'Lập xuân',
+	'Vũ thuỷ',
+	'Kinh trập',
+]
+const TERM_ZH = [
+	'春分',
+	'清明',
+	'穀雨',
+	'立夏',
+	'小滿',
+	'芒種',
+	'夏至',
+	'小暑',
+	'大暑',
+	'立秋',
+	'處暑',
+	'白露',
+	'秋分',
+	'寒露',
+	'霜降',
+	'立冬',
+	'小雪',
+	'大雪',
+	'冬至',
+	'小寒',
+	'大寒',
+	'立春',
+	'雨水',
+	'驚蟄'
+]
+
+// Get can/chi of a lunar date
+function getZodiac({year, month, day, jd}) {
+	let yearZodiac = {
+		can: (year + 6) % 10,
+		chi: (year + 8) % 12
+	}
+	let monthZodiac = {
+		can: (year * 12 + month + 3) % 10,
+		chi: (month + 1) % 12
+	}
+	let dayZodiac = {
+		can: (jd + 9) % 10,
+		chi: (jd + 1) % 12
+	}
+	return {yearZodiac, monthZodiac, dayZodiac}
+}
+
+function getZodiacText(zodiac, lang) {
+	switch (lang) {
+		case "vi":
+			return CAN_VI[zodiac.can] + " " + CHI_VI[zodiac.chi]
+		case "zh":
+			return CAN_ZH[zodiac.can] + CHI_ZH[zodiac.chi]
+		default:
+			throw("Unsupported")
+	}
+}
+
+// Part 2: Update DOM
+
+// DOM
+const dateInput = document.querySelector('#solar-date')
+const calendar = document.querySelector('#lunar-solar-cal')
+const solarYearOutput = document.querySelector('#solar-year')
+const solarMonthOutputEN = document.querySelector('#solar-month-en')
+const solarMonthOutputVI = document.querySelector('#solar-month-vi')
+
+const solarDayOutput = document.querySelector('#solar-day')
+const specialDayOutputVI = document.querySelector('#special-day-vi')
+const specialDayOutputZH = document.querySelector('#special-day-zh')
+
+const solarWeekdayOutputEN = document.querySelector('#solar-weekday-en')
+const solarWeekdayOutputVI = document.querySelector('#solar-weekday-vi')
+const solarWeekdayOutputZH = document.querySelector('#solar-weekday-zh')
+
+const lunarYearOutputVI = document.querySelector('#lunar-year-vi')
+const lunarMonthOutputVI = document.querySelector('#lunar-month-vi')
+const lunarMonthZodiacOutputVI = document.querySelector('#lunar-month-zodiac-vi')
+const lunarDayZodiacOutputVI = document.querySelector('#lunar-day-zodiac-vi')
+const solarTermVI = document.querySelector('#solar-term-vi')
+
+const lunarDayOutput = document.querySelector('#lunar-day')
+
+const lunarYearOutputZH = document.querySelector('#lunar-year-zh')
+const lunarMonthOutputZH = document.querySelector('#lunar-month-zh')
+const lunarMonthZodiacOutputZH = document.querySelector('#lunar-month-zodiac-zh')
+const lunarDayOutputZH = document.querySelector('#lunar-day-zh')
+const lunarDayZodiacOutputZH = document.querySelector('#lunar-day-zodiac-zh')
+const solarTermZH = document.querySelector('#solar-term-zh')
+
+const dayBeforeBtn = document.querySelector('#nav-day-before')
+const dayAfterBtn = document.querySelector('#nav-day-after')
+
+const monthFormatEN = new Intl.DateTimeFormat("en-US", {month: "long"})
+const monthFormatVI = new Intl.DateTimeFormat("vi-VN", {month: "long"})
+const weekdayFormatEN = new Intl.DateTimeFormat("en-US", {weekday: "long"})
+const weekdayFormatVI = new Intl.DateTimeFormat("vi-VN", {weekday: "long"})
+const weekdayFormatZH = new Intl.DateTimeFormat("zh-CN", {weekday: "long"})
+
+const SOLAR_MONTH_VI = ["Một", "Hai", "Ba", "Tư", "Năm", "Sáu", "Bảy", "Tám", "Chín", "Mười", "Mười Một", "Mười Hai"]
+const LUNAR_MONTH_VI = ["Giêng", "Hai", "Ba", "Tư", "Năm", "Sáu", "Bảy", "Tám", "Chín", "Mười", "Mười Một", "Chạp"]
+const LUNAR_MONTH_ZH = ["元", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "臘", ]
+const tzOffset = 7
+
+const CHINESE_NUMBERS = "一二三四五六七八九十"
+
+function getChineseDay(day) {
+	if (day <= 10) {
+		return "初" + CHINESE_NUMBERS[day - 1]
+	} else if (day < 20) {
+		return "十" + CHINESE_NUMBERS[(day - 1) % 10]
+	} else if (day == 20) {
+		return "二十"
+	} else if (day < 30) {
+		return "廿" + CHINESE_NUMBERS[(day - 1) % 10]
+	} else {
+		return "三十"
+	}
+}
+
+function isFullMonth(date, lunarDate) {
+	const daysTill30 = 30 - lunarDate.day
+	date.setDate(date.getDate() + daysTill30)
+	let day30 = convertSolarToLunar(date, tzOffset)
+	return day30.month === lunarDate.month
+}
+
+const specialDaysSolar = {
+	"01-01": {
+		vi: "Tết Dương Lịch",
+		zh: "元旦",
+		isHoliday: true
+	},
+	"02-03": {
+		vi: "Ngày thành lập Đảng Cộng Sản Việt Nam",
+		isHoliday: false
+	},
+	"02-14": {
+		vi: "Lễ tình nhân (Valentine)",
+		isHoliday: false
+	},
+	"03-08": {
+		vi: "Ngày Quốc tế Phụ nữ",
+		isHoliday: false
+	},
+	"04-30": {
+		vi: "Ngày Thống nhất",
+		isHoliday: true
+	},
+	"05-01": {
+		vi: "Ngày Quốc tế Lao động",
+		zh: "劳动节",
+		isHoliday: true
+	},
+	"06-01": {
+		vi: "Ngày Quốc tế thiếu nhi",
+		isHoliday: false
+	},
+	"08-19": {
+		vi: "Ngày kỷ niệm Cách mạng Tháng 8 thành công",
+		isHoliday: false
+	},
+	"09-02": {
+		vi: "Ngày Quốc Khánh",
+		isHoliday: true
+	},
+	"10-01": {
+		vi: "Ngày quốc tế người cao tuổi",
+		isHoliday: false
+	},
+	"10-20": {
+		vi: "Ngày Phụ nữ Việt Nam",
+		isHoliday: false
+	},
+	"10-31": {
+		vi: "Halloween",
+		isHoliday: false
+	},
+	"11-19": {
+		vi: "Ngày Quốc tế Nam giới",
+		isHoliday: false
+	},
+	"11-20": {
+		vi: "Ngày Nhà giáo Việt Nam",
+		isHoliday: false
+	},
+	"12-24": {
+		vi: "Đêm Giáng sinh",
+		isHoliday: false
+	},
+	"12-25": {
+		vi: "Giáng sinh",
+		isHoliday: false
+	}
+}
+const specialDaysLunar = {
+	"1-1": {
+		vi: "Tết Nguyên Đán",
+		zh: "春节",
+		isHoliday: true
+	},
+	"1-15": {
+		vi: "Tết Nguyên Tiêu",
+		zh: "元宵节",
+		isHoliday: false
+	},
+	"3-3": {
+		vi: "Tết Hàn thực",
+		isHoliday: false
+	},
+	"3-10": {
+		vi: "Giỗ tổ Hùng Vương",
+		isHoliday: true
+	},
+	"5-5": {
+		vi: "Tết Đoan ngọ",
+		isHoliday: false
+	},
+	"7-7": {
+		vi: "Lễ Thất tịch",
+		zh: "七夕",
+		isHoliday: false
+	},
+	"7-15": {
+		vi: "Lễ Vu Lan",
+		isHoliday: false
+	},
+	"8-15": {
+		vi: "Tết Trung Thu",
+		zh: "中秋节",
+		isHoliday: false
+	},
+	"12-23": {
+		vi: "Tết ông Công ông Táo",
+		isHoliday: false
+	}
+}
+
+function getSpecialDays(date, lunarDate) {
+	const dateStr = date.toISOString().substring(5, 10)
+	const lunarStr = lunarDate.month + "-" + lunarDate.day
+	return [specialDaysSolar[dateStr], specialDaysLunar[lunarStr]]
+}
+
+function updateOutputs() {
+	if (dateInput.valueAsDate === null) {
+		dateInput.valueAsDate = new Date()
+	}
+	const date = dateInput.valueAsDate
+	solarYearOutput.innerText = date.getFullYear()
+	solarMonthOutputEN.innerText = monthFormatEN.format(date)
+	solarMonthOutputVI.innerText = monthFormatVI.format(date)
+	solarDayOutput.innerText = date.getDate()
+	solarWeekdayOutputEN.innerText = weekdayFormatEN.format(date)
+	solarWeekdayOutputVI.innerText = weekdayFormatVI.format(date)
+	solarWeekdayOutputZH.innerText = weekdayFormatZH.format(date)
+
+	const lunarDate = convertSolarToLunar(date, tzOffset)
+	const zodiac = getZodiac(lunarDate)
+	lunarYearOutputVI.innerText = "Năm " + getZodiacText(zodiac.yearZodiac, "vi")
+	lunarYearOutputZH.innerText = getZodiacText(zodiac.yearZodiac, "zh") + "年"
+	lunarMonthOutputVI.innerText = "Tháng " + LUNAR_MONTH_VI[lunarDate.month - 1]
+	lunarMonthOutputZH.innerText = LUNAR_MONTH_ZH[lunarDate.month - 1] + "月"
+	if (lunarDate.isLeap) {
+		lunarMonthOutputVI.innerText += " nhuận"
+	}
+	if (isFullMonth(structuredClone(date), lunarDate)) {
+		lunarMonthOutputVI.innerText += " (đủ)"
+		lunarMonthOutputZH.innerText += "大"
+	} else {
+		lunarMonthOutputVI.innerText += " (thiếu)"
+		lunarMonthOutputZH.innerText += "小"
+	}
+	lunarDayOutput.innerText = lunarDate.day
+	lunarMonthZodiacOutputVI.innerText = "Tháng " + getZodiacText(zodiac.monthZodiac, "vi")
+	lunarMonthZodiacOutputZH.innerText = getZodiacText(zodiac.monthZodiac, "zh") + "月"
+	lunarDayZodiacOutputVI.innerText = "Ngày " + getZodiacText(zodiac.dayZodiac, "vi")
+	lunarDayOutputZH.innerText = getChineseDay(lunarDate.day)
+	lunarDayZodiacOutputZH.innerText = getZodiacText(zodiac.dayZodiac, "zh") + "曰"
+
+	const solarTerm = getSolarTerm(lunarDate.jd, tzOffset)
+	solarTermVI.innerText = "Tiết " + TERM_VI[solarTerm]
+	solarTermZH.innerText = TERM_ZH[solarTerm]
+
+	const specialDays = getSpecialDays(date, lunarDate)
+	specialDayOutputVI.innerText = ""
+	specialDayOutputZH.innerText = ""
+	let isHoliday = false
+	for (let sday of specialDays) {
+		if (sday === undefined) {
+			continue
+		}
+		specialDayOutputVI.innerText += "\n" + sday.vi
+		if (sday.zh) {
+			specialDayOutputZH.innerText += " · " + sday.zh
+		}
+		if (sday.isHoliday) {
+			isHoliday = true
+		}
+	}
+	if (isHoliday || date.getDay() === 0) {
+		calendar.className = "holiday"
+	} else {
+		calendar.className = ""
+	}
+
+}
+
+dayBeforeBtn.onclick = () => {
+	let date = new Date(dateInput.valueAsDate.setDate(dateInput.valueAsDate.getDate() - 1))
+	dateInput.valueAsDate = date
+	updateOutputs()
+}
+dayAfterBtn.onclick = () => {
+	let date = new Date(dateInput.valueAsDate.setDate(dateInput.valueAsDate.getDate() + 1))
+	dateInput.valueAsDate = date
+	updateOutputs()
+}
+document.querySelector("#nav-today").onclick = () => {
+	console.log("a")
+	dateInput.valueAsDate = new Date()
+	updateOutputs()
+}
+document.addEventListener("DOMContentLoaded", updateOutputs)
+
+dateInput.onchange = updateOutputs
diff --git a/content/misc/books.md b/content/misc/books.md
index 6a2a284..7d6bdd2 100644
--- a/content/misc/books.md
+++ b/content/misc/books.md
@@ -28,11 +28,11 @@ I read and liked:
 - <i>Le petit prince</i>, a novella with a childish theme but discuss many
     aspects of life in a lighthearted way.
 - [Ellana][ellana] (<i>Le Pacte des MarchOmbres</i> series) (French)
+- [Tous les hommes sont mortels][hommes-mortels] (French)
 
 Books I'm reading:
 
 - [Ellana: L'envol][ellana-2] (<i>Le Pacte des MarchOmbres</i> series) (French)
-- [Tous les hommes sont mortels][hommes-mortels] (French)
 - <i>The Necromancer</i> (<i>The Secrets of the Immortal Nicholas Flamel</i>
     series)
 
diff --git a/content/posts/2025-02-23-last-post.md b/content/posts/2025-02-23-last-post.md
new file mode 100644
index 0000000..72e4dec
--- /dev/null
+++ b/content/posts/2025-02-23-last-post.md
@@ -0,0 +1,67 @@
+---
+title: "This will be the last post on this RSS feed"
+date: 2025-02-23
+lang: en
+categories: [ blog ]
+tags: []
+translationKey: "2025-02-23-last-post"
+---
+
+I should preface this by saying I am not taking this website down or anything.
+If you are not bothered by all meta stuff, the takeaway is to update your
+<abbr>RSS</abbr> feed link from <https://xrvs.net/en/index.xml> to
+<https://xrvs.net/index.xml>.  It was changed from the latter to the former
+previously, and I believed it did wreck the subscription for some of you (not
+that I believe there are that many of *you*), which I regretted, so I make this
+announcement to not make that mistake again.  It will probably take at least a
+month or more since this post is published until I finish with the update, so
+take your time.
+
+## Motivation
+
+As you can see, this website hasn't received much updates (last post was almost
+a year ago), and it's probably going to stay that way for a while.  There's a
+joke that there are two kinds of personal websites: one that runs on wordpress
+and receive weekly update, and another where there's only two posts, first post
+is "I set up my website with jekyll" and the second post is "I changed from
+jekyll to hugo".  I am trying hard to not be the second one---I promise, these
+changes will not be for the sake of bikeshedding!---but well, it's kinda hard
+to find something to write about when most of your time is spent at work, and
+talking publicly about stuff happening at work is legally risky.
+
+So, I intend to spend more writing reviews on books and games as I read and
+play them.  I am not satisfied with the current state of their the book reviews
+section.  I have a list of books I read in [the misc](/en/misc/books/) and
+another list with [the reviews](/en/book-reviews/), which is a duplication.
+After the update, there will be one list at [/reading/](/reading/), with
+three-column kanban-esque design:
+
+- Backlog: list of books I intend to read, maybe with a reason why I want to
+    reador where I got recommended that book
+- Currently reading: books I'm currently reading, probably with comments as I
+    read (likely contain spoiler)
+- Read: books that I finished reading, with the review.
+
+Note that obviously, I will not update the old posts to backfill the reading
+log or reason I want to read a book, if they're not already there.  Game
+reviews will also be in this format.
+
+The second issue with the book reviews is, I review the book in the language I
+read the book in.  As a result, the reviews are scattered.  I intend to merge
+the languages into one so it'd be easier to track.  It's not like I translate
+posts or enjoy translating them anyways, so I'll also remove any translations
+that happened to be there as well.  I will figure out how to add a filter for
+language in the <abbr>RSS</abbr> feed.  Let me know if you're aware of such a
+way.
+
+Another improvements that I planned is the taxonomy (i.e. tags and categories).
+I'd like the categories to be clearly defined with a hierarchy rather than a
+mess it is right now---it is for this reason that I hide those from the main
+menu bar.
+
+## Change plan summary
+
+- Add new list type "backlog" for books, movies, games etc
+- Improve taxonomy
+- Removing post translations
+- Move site root from /en/ to /
diff --git a/content/sw-notes/ssh-timeout.md b/content/sw-notes/ssh-timeout.md
new file mode 100644
index 0000000..fdb53d9
--- /dev/null
+++ b/content/sw-notes/ssh-timeout.md
@@ -0,0 +1,20 @@
+---
+title: "How to prevent SSH timeout from hanging your terminal"
+date: 2025-03-17
+draft: true
+lang: en
+categories: [ blog ]
+tags: []
+translationKey: "ssh-timeout"
+---
+
+Sometimes, I open an SSH session and then forget about it. When I get back to it, it hangs indefinitely, without a way to close it other than closing the terminal.
+
+To avoid this, add this to the client config:
+
+```sshconfig
+Host *
+        ServerAliveInterval 100
+```
+
+If you're disconnected from the SSH server, you'll get this message `Timeout, server example.com not responding.` and the connection is terminated.