Today is Thrusday, April 10th, which day of the week is September 3rd? It is actually easy to calculate these things, without the computer's help:
As today is Thursday, 17th, 24th and 31st are also Thursdays. April has only 30 days, so 31st of April is actually May 1st (and it is a Thursday).
Continue with Thursdays: May 1st, 8th, 15th, 22nd, 29th, 36th. May 36th is (36 - 31) = 5th of June.
June 5th, 12th, 19th, 26th, 33rd [-30] = July 3rd, 10th, 17th, 24th, 31st, July 38th = August 7th, 14th, 21st, 28th, 35th, which is September 4th - those were all Thursdays, so September 3rd is a Wednesday.
To go faster we could add several weeks at a time - like 3 or 4 to not overshoot a month completely. 3 weeks (21 days) probably is easier to add, arithmetics-wise, than 28 days.
Let's check October 17th: September 3rd is Wednesday, so September 24th is, too and so is September 45th, which is October 15th. Therefore, October 17th is a Friday.
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2 comments:
An alternate method is to flip 6 months ahead on your calendar and just read it off.
Of course, if I didn't have my computer, laptop, pda, GPS or cell phone I guess that your method would work. Or, maybe I'm just too connected to technology.
Oh, it is certainly not a replacement for an electronic calendar, it is for those rare moments when I don't have one on/near me - like when I'm in the bed, almost ready to fall asleep but suddenly have an urge to know which day of the week a friend's birthday will be on.
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