macjeff Posted May 16, 2023 Posted May 16, 2023 I need to calculate Easter. Here are the rules The simple standard definition of Easter is that it is the first Sunday after the full Moon that occurs on or after the spring equinox. If the full Moon falls on a Sunday then Easter is the next Sunday. Timedata does month and season. Climacell does moon phase. ** Yes I know there is a google holidays but it only flags which days are holidays- yes or no. And the issue is other holidays fall in the same period. So I need to know for sure if its easter. So how can I calculate using TimeData and Climacell when Easter is. So I know its Spring and I know its March or April. Now how do I say (AFTER) the first full moon???
Michel Kohanim Posted May 17, 2023 Posted May 17, 2023 I think it'll be great to have a holiday node server. Perhaps a node server for https://www.timeanddate.com/calendar/ ? With kind regards, Michel
Ross Posted May 18, 2023 Posted May 18, 2023 @macjeff 1) I found an Excel formula for Easter online (assumes the Year is in A1): =FLOOR("5/"&DAY(MINUTE(A1/38)/2+56)&"/"&A2,7)-34 I can't vouch for it, but I've checked several dates and they appear correct. Now, you "just" need to put it into ISY math. 2 There is a HolidaysGoogle node server. I don't use it, but Easter might be included. 3) The Timedata node server has a "Days since Unix Epoch" number. You could brute force enter 25 variables with the next 25 Easter days and run a formula at 12:00:01am checking to see if this DsUE= one of those 25 variables. This will keep you going until the year 2048. The EISY might be a museum piece by then. Good luck, Ross
macjeff Posted May 18, 2023 Author Posted May 18, 2023 1 hour ago, Ross said: @macjeff 1) I found an Excel formula for Easter online (assumes the Year is in A1): =FLOOR("5/"&DAY(MINUTE(A1/38)/2+56)&"/"&A2,7)-34 I can't vouch for it, but I've checked several dates and they appear correct. Now, you "just" need to put it into ISY math. 2 There is a HolidaysGoogle node server. I don't use it, but Easter might be included. 3) The Timedata node server has a "Days since Unix Epoch" number. You could brute force enter 25 variables with the next 25 Easter days and run a formula at 12:00:01am checking to see if this DsUE= one of those 25 variables. This will keep you going until the year 2048. The EISY might be a museum piece by then. Good luck, Ross Although I really appreciate the efforts this is too much for my math skills. I like Michel's idea unless someone has a program they have written in the ISY they would share.
Geddy Posted May 18, 2023 Posted May 18, 2023 @macjeff is Easter the ONLY date you want to figure? Why not just program with specific dates? Dates through 2033... Year Holiday Weekday Date 2023 Easter Sunday Apr 9 2024 Easter Sunday Mar 31 2025 Easter Sunday Apr 20 2026 Easter Sunday Apr 5 2027 Easter Sunday Mar 28 2028 Easter Sunday Apr 16 2029 Easter Sunday Apr 1 2030 Easter Sunday Apr 21 2031 Easter Sunday Apr 13 2032 Easter Sunday Mar 28 2033 Easter Sunday Apr 17 uncheck "daily" and you get the yyyy/mm/dd option. Just plug those into your program(s) for Easter.
macjeff Posted May 18, 2023 Author Posted May 18, 2023 8 minutes ago, Geddy said: @macjeff is Easter the ONLY date you want to figure? Why not just program with specific dates? Dates through 2033... Year Holiday Weekday Date 2023 Easter Sunday Apr 9 2024 Easter Sunday Mar 31 2025 Easter Sunday Apr 20 2026 Easter Sunday Apr 5 2027 Easter Sunday Mar 28 2028 Easter Sunday Apr 16 2029 Easter Sunday Apr 1 2030 Easter Sunday Apr 21 2031 Easter Sunday Apr 13 2032 Easter Sunday Mar 28 2033 Easter Sunday Apr 17 uncheck "daily" and you get the yyyy/mm/dd option. Just plug those into your program(s) for Easter. I am sure there will be others. Again I love Michels suggestion. I guess I could enter all of those
MrBill Posted May 18, 2023 Posted May 18, 2023 It seems it would be pretty simple for a node server to achieve this, as there is a python library for holiday calculations.https://python-holidays.readthedocs.io/en/latest/ perhaps the developer of time and date node server could add holidays. US Easter might be missing (seems to only have UK Easter on a Monday), but Good Friday is correct so Easter can be known that way. Hopefully that information is out of date and US Easter is included.
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