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Forum Index : Microcontroller and PC projects : DAY OF WEEK ERRORS
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OA47 Guru  Joined: 11/04/2012 Location: AustraliaPosts: 926 |
I have copied a formula from the web to get the day of week from the date. The code is giving me a zero response (Sunday) can anyone see where I have made the error? Sub GetDayOfWeek D=Val(Left$(Date$,2)) M=Val(Mid$(Date$,4,2)) C=Val(Mid$(Date$,7,2)) Y=Val(Mid$(Date$,9,2)) W=(D+(2.6*M-0.2)-2*C+Y+Y/4+C/4) Mod 7 Return 0A47 |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1873 |
Have a look in Fruit of the Shed there is a function in there for it. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| morgs67 Regular Member  Joined: 10/07/2019 Location: AustraliaPosts: 75 |
This is what I use- (could be a bit wordy!) 'Tomohiko Sakamoto's Algorithm - lookup table Dim integer MonthLookup(11) = (0,3,2,5,0,3,5,1,4,6,2,4) Dim MonthNames$(11) = ("January","February","March","April","May","June","July","August","September","October","November","December") 'Tomohiko Sakamoto's Algorithm - dayname lookup table Dim DayNames$(6) = ("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday") ' Tomohiko Sakamoto's Algorithm- Finding the day of the week Function DayOfWeek$(d,m,y) Local dow = 0 LOCAL am = m LOCAL ay = y 'if month is less than 3 reduce year by 1 if am<3 then ay = ay-1 dow = (ay + (ay\4) - (ay\100) + (ay\400) + MonthLookup(am-1)+d)MOD 7 DayOfWeek$ = DayNames$(dow) End Function Good for the Georgian calendar. Tony Footnote added 2024-04-09 13:20 by morgs67 @palcal Would that be Gregorian. -ooops spellcheck |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1873 |
Would that be Gregorian. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
Depending on the version of MMBasic this may be a little shorter:- > date$="09-04-2024" > ? DAY$(date$) Tuesday > @OA47 in your first post see if changing "Return" to "End Sub" makes any difference. Edit. No, just the same. Edited 2024-04-09 13:35 by phil99 |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 926 |
Thanks Phil, I had not caught up with DAY$(DATE$) and that works perfectly as I am using mm.ver=5.070725 in this project. Changing RETURN to End Sub did not change the result, it must have been an old programmers Freudian slip.  0A47 |
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| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
With a minor change the Sub seems to work. >date$="01-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 01-04-2024 1 4 24 1 Monday > date$="02-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 02-04-2024 2 4 24 2 Tuesday > date$="03-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 03-04-2024 3 4 24 3 Wednesday > date$="04-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 04-04-2024 4 4 24 4 Thursday > date$="05-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 05-04-2024 5 4 24 5 Friday > date$="06-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 06-04-2024 6 4 24 6 Saturday > date$="07-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 07-04-2024 7 4 24 0 Sunday > date$="08-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 08-04-2024 8 4 24 1 Monday > date$="09-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 09-04-2024 9 4 24 2 Tuesday > date$="10-04-2024" : GetDayOfWeek : ? date$,D,M,Y,W, DAY$(date$) 10-04-2024 10 4 24 3 Wednesday > LIST Sub GetDayOfWeek D=Val(Left$(Date$,2)) M=Val(Mid$(Date$,4,2)) C=Val(Mid$(Date$,7,2)) Y=Val(Mid$(Date$,9,2)) W=(D+(2.6*M-0.2)-2*C+Y+Y/4+C/4 +2) Mod 7 End Sub > |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 926 |
Phil, I am not sure why the addition of 2 makes it work but well done. 0A47 |
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| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
By chance it happened to produce 0 on Tuesday and 1 om Wednesday so added an offset. |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
Here's one from "Microblocks" who was a quite prolific and very capable TBS member for a number of years. Unfortunately he is no longer with us. It looks a bit long but there's a lot of padding there that can be shortened. Sub dayndate 'day-of-week code thanks to "MicroBlocks" at TBS forum. Local integer year,month,day,dayofweek,a,m,y Local string DOW$(6) length 3 = ("Sun","Mon","Tue","Wed","Thu","Fri","Sat") Local string dispdayndate$ curdate$ = Date$ Year=Val(Mid$(curdate$,7,4)) Month=Val(Mid$(curdate$,4,2)) Day=Val(Mid$(curdate$,1,2)) a = Int((14-month)/12) m = month + 12*a - 2 y = year - a DayOfWeek = (day+y+Int(y/4)-Int(y/100)+Int(y/400)+Int(31*m/12))Mod 7 dispdayndate$ = DOW$(DayOfWeek)+" "+curdate$ Text MM.HRes/2,MM.VRes-MM.Info(FONTHEIGHT),dispdayndate$,CB End Sub Greg |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 926 |
Greg, years ago I was in regular contact with Microblocks we had a good trade happening, I would supply him with electronic magazines and he could source the 28 pin micromites from just around the corner from where he lived. IIRC his christian name was Jean. 0A47 |
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| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
This one:- W=(D+(2.6*M-0.2)-2*C+Y+Y/4+C/4 +2) Mod 7 ignores the century and 4 century corrections. This one:- DayOfWeek = (day+y+Int(y/4)-Int(y/100)+Int(y/400)+Int(31*m/12))Mod 7 ignores the 16 century correction next due in 3200. Keep an eye out for that ;-) |
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Quazee137 Guru Joined: 07/08/2016 Location: United StatesPosts: 571 |
Here's what I've used for some time. Works going forward in time. Function dow(d As Integer,m As Integer,y As Integer) As Integer ' 1 2 3 4 5 6 7 ' sun mon tue wed the fri sat If m < 3 Then m=m + 12 y=y-1 End If dow = 1 + (d + ((26 * m+1)/10) - (2 * (y\100)) + y + (y\4) + (y\400) ) Mod 7 End Function |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4226 |
As hinted before: print day$(date$) Volhout PicomiteVGA PETSCII ROBOTS |
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| paceman Guru Joined: 07/10/2011 Location: AustraliaPosts: 1329 |
Graeme - yes I knew he was Jean, and he was pretty young when he passed away. He helped me with some programming stuff and helped a lot more Thai students with his electronics school where he was living in Thailand. Greg |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 926 |
It seems his Microblcks username is still registered in the member list but his original TZadvantage no longer exists. 0A47 |
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