Month Calendar with Lunar Dates and ISO Weeks

The Calendar panel of the date tool is a Monday-first month grid: 42 cells, with days outside the current month dimmed. Every cell carries the day number plus a second line — a festival, a solar term, or the lunar day — and statutory rest days and make-up workdays are badged off and wk. Clicking a day fills six cards: Gregorian, Lunar, Ganzhi, Zodiac, Solar terms and Week · DOY, followed by a festival or holiday line. In the English interface the ganzhi cycle is romanised (pinyin) and the solar terms and zodiac are shown in English; the traditional auspicious/inauspicious lists are Chinese-language almanac content and appear only in the Chinese interface.

Updated 2026-10-01Reviewed by CalcX Editorial Team5 sources3 min read

How to use it

Move through monthswith the arrow buttons or the year and month selects; Today returns to the browser's date.
Click any cellto select it; the cards below always describe the selected day, including dimmed days from the neighbouring month.
Read the badges first.off marks a statutory day off and wk a make-up workday; the colored line under the grid names the festival or the holiday.
Check Week · DOYwhen a reference number is needed: the card shows the ISO week and the day of the year, and Solar terms brackets the selected day between two terms with their dates.

Worked examples

You open	The panel reads
May 2026	42 cells from 2026-04-27 to 2026-06-07; 31 in-month days; off badges on 1–5 May, wk on 9 May
Select 2026-05-04	Week · DOY W19 · day 124; holiday line — day off; solar-terms bracket dates 04-20 → 05-05
Select 2026-05-09	Week · DOY W19 · day 129; wk — makeup workday
Select 2026-12-31	Week · DOY W53 · day 365
Select 2027-01-01	Week · DOY W53 · day 1

The Week · DOY card follows ISO week-years, not calendar years: 31 December 2026 and 1 January 2027 both read W53, and 3 January 2027 still does; only Monday 4 January opens 2027-W01. A date can therefore belong to the week-year before or after the one printed on its own grid header. The May 2026 badges are equally literal: 1–5 May are statutory days off, and Saturday 9 May is a make-up workday, so the holiday block is five rest days plus one working weekend day.

Limits

One month at a time.: The grid is fixed at 42 cells, so edge cells belong to neighbouring months — May 2026 opens on 27 April. There is no multi-month or year view, and cells are not printed.
Lunisolar cards are traditional values.: Lunar dates, the romanised ganzhi cycle and the English solar-term and zodiac names come from lunisolar tables; the auspicious/inauspicious lists are Chinese-language content shown only in the Chinese interface, where they are labelled as folklore. Use the Gregorian, holiday and week readings for planning.
What it does not do.: It will not measure the distance between two picked days or count business days across a block. For that, pair the grid with Date Difference; to count down to a birthday on it, use Countdown & Age.

Where it helps

Checking a lunar date

Family dates often follow the lunisolar calendar: click the solar date and read the Lunar and Zodiac cards, then confirm the next occurrence in Countdown & Age, which tracks the next lunar birthday.

Planning a holiday block

Badges make a statutory break visible at a glance — which days are off, and which weekend day is a make-up workday — before a leave request or a production schedule is written.

References

ISO, ISO 8601-1:2019, Date and time — Representations for information interchange, iso.org （访问日期：2026-10-01）— week and day-of-year notation.
Wikipedia, ISO week date （访问日期：2026-10-01）— why 1 January can sit in week 53.
Wikipedia, Chinese calendar （访问日期：2026-10-01）— lunisolar months, the ganzhi cycle and almanac days.
Wikipedia, Solar term （访问日期：2026-10-01）— the 24 terms shown as green grid labels.
Wikipedia, Public holidays in China （访问日期：2026-10-01）— the off and wk badges.