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Show HN: One Page Calendar 2020

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Re: Show HN: One Page Calendar 2020

#91

Post by surround »

kseistrup wrote: post #78

This reminds me of the Doomsday algorithm¹. The doomsday for 2020 falls on a saturday, which is aligned neatly as the diagonal in the one page calendar. Once you know the doomsday of a given year, you can calculate the day of week for any date in that year in your head. [1] http://rudy.ca/doomsday.html

You should submit that to HN.

Re: Show HN: One Page Calendar 2020

#92

Post by bscphil »

j1elo wrote: post #36
j1elo wrote: post #33

For the last 3 years I've been printing several copies of the Compact Calendar by David Seah [1]. It's as its name implies a compact form calendar that spans the whole year in a single page, and leaves enough side space to annotate stuff as needed. It's very cool and useful, although it would be nice having an open-source based version (i.e. LibreOffice), for those of us that don't have an MS Office license... [1]: h…

Wow I just discovered that it's uBlock Origin that totally breaks the page layout. Which means that for some reason this page's CSS are detected as an ad source, and blocked! Curious, as it seems to be a plain and simple static site. EDIT: It is the "AdGuard Annoyances" optional list, which is disabled by default but I like to enable: https://kb.adguard.com/en/general/adguard-ad-filters#annoyan...

It's also blocked by Fanboy's annoyances list. It's a generic blocker, /wp-gdpr, probably designed to block a Wordpress plugin's GDPR banner. My guess is this site is using such a plugin, and then stuck the rest of its CSS in the plugin's folder instead of a generic folder like CSS, so it ends up blocked there too. You can whitelist this URL on the site if you want without having to whitelist the site as a whole.

Re: Show HN: One Page Calendar 2020

#94

Post by sh87 »

j1elo wrote: post #33

For the last 3 years I've been printing several copies of the Compact Calendar by David Seah [1]. It's as its name implies a compact form calendar that spans the whole year in a single page, and leaves enough side space to annotate stuff as needed. It's very cool and useful, although it would be nice having an open-source based version (i.e. LibreOffice), for those of us that don't have an MS Office license... [1]: h…

I print a bunch of these (sometimes multiple calendars on a page) and stick them up on the wall. Very useful to separate events / agendas of different classes on separate calendars e.g. birthdays, travel plans, project deadlines, appointments, goal tracking, habit tracking all go on different calendars but on the same wall.

Much cleaner than putting them all on the same calendar and fight for space.

Re: Show HN: One Page Calendar 2020

#98

Post by tzs »

kseistrup wrote: post #78

This reminds me of the Doomsday algorithm¹. The doomsday for 2020 falls on a saturday, which is aligned neatly as the diagonal in the one page calendar. Once you know the doomsday of a given year, you can calculate the day of week for any date in that year in your head. [1] http://rudy.ca/doomsday.html

Here's a probably faster/easier way for most people to compute the Doomsday for a given year.

The Doomsday is the sum of a factor determined by the century part of the year and a factor determined by year within the century.

The century factor is:

  Century  Factor

  20xx     2
  21xx     0
  22xx     5
  23xx     3
This pattern repeats every 4 centuries indefinitely forward, and however far back you can go in your jurisdiction before you hit whatever calendar that was used there before the Gregorian calendar. (If you want a formula for this, it is 2 + (C % 4) x 5, where C is the first two digits of the year, but since there are only 4 items in the pattern, and most people will actually only care about one or two centuries, I'd just memorize the relevant factors).

For the factor determined by the year within the century, let T be the tens digit of that year and U the ones digit.

If T is even, the factor is:

  2 x T + U + LE(U)
I'll cover LE below.

If T is odd, the factor is:

  2 x T + 3 + U + LO(U)
LO() and LE() are corrections to take into account leap years in years where U != 0. Leap years when U = 0 are already accounted for in the 2 x T. Here are LE() and LO().

  LE(U) = 0 if U
Or in English, in even decades add 1 if U >= 4, and add another 1 if U >= 8. In odd decades, add 1 if U >= 2, and another 1 if U >= 6.

Example: 2020. Century 20 factor = 2, T=2, U=0. T is even. Doomsday is 2 + 2 x 2 + 0 + 0 = 6 (Saturday).

Here are the years used for some of the examples in the link you gave.

2019. T=1, U=9. We've got an odd T, and a leap year correction of 2. Century is still 20. That gives us 2 + 2 x 1 + 3 + 2 + 2 = 4 (Thursday). I've taken the liberty of reducing mod 7 along the way, so used 2 instead of 9 when adding in U. Note that when figuring the leap year factor you have to use the actual U, not U mod 7.

2018. 2 + 2 + 3 + 1 + 2 = 3 (Wednesday).

2017. 2 + 2 + 3 + 0 + 2 = 2 (Tuesday).

2069. 2 + 2 x 6 + 2 + 2 = 4 (Thursday).

1929. 3 for 19xx. 3 + 2 x 2 + 2 + 2 = 4 (Thursday).

1999. 3 + 2 x 2 + 3 + 2 + 2 = 0 (Sunday).

1982. 3 + 2 x 1 + 2 = 0 (Sunday).

1969. 3 + 2 x 6 + 2 + 2 = 5 (Friday).

2167. 0 + 2 x 6 + 0 + 1 = 6 (Saturday).

Re: Show HN: One Page Calendar 2020

#99

Post by OJFord »

It took me stupidly long to work out how to read it, which I think was just because days don't progress in the usual way, i.e. avoided if months were swapped to the rows, and days read across.

Another improvement IMO would be to list e.g. 'June (30)', since at the moment the #days in each month is lost to compression.

Re: Show HN: One Page Calendar 2020

#100

Post by andai »

jez wrote: post #75
j1elo wrote: post #33

For the last 3 years I've been printing several copies of the Compact Calendar by David Seah [1]. It's as its name implies a compact form calendar that spans the whole year in a single page, and leaves enough side space to annotate stuff as needed. It's very cool and useful, although it would be nice having an open-source based version (i.e. LibreOffice), for those of us that don't have an MS Office license... [1]: h…

Oh cool! I happened to build something similar a while back, because I was frustrated with the way that the Unix `cal` program laid out all the months in a 3 x 4 grid instead of in a continuous format: https://github.com/jez/calz So for example to get the same year-long calendar view as the Compact Calendar would have, I can type calz 2020 calz has a couple other features too which make it nicer to use than `cal`, bu…

I have calz now. Thanks!

Now I just need a really long e-ink screen.

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