Re: date math
This WebDNA talk-list message is from 2005
It keeps the original formatting.
numero = 61838
interpreted = N
texte = Dave, the problem with this is that if a time was appended that is less than the current time, you have a negative integer. This is why, when dealling with Date and Time down to the seconds, you will always do better with "seconds since epoch". Donovan Dave Hurley wrote: > Since you have your date and time fields separated, you may need to > create dates and times with them. By enclosing the whole thing in {} and > setting it as a math variable, it will be in the form of an integer, > which simplifies any calculations: > > [text]Emon=04[/text] > [text]Eday=20[/text] > [text]Eyr=2005[/text] > > [text]EHr=11[/text] > [text]Emin=45[/text] > [text]Esec=45[/text] > > entered date as integer = [Math]Edate={[Emon]/[Eday]/[Eyr]}[/Math] > > entered time as integer = [Math]Etime={[EHr]:[EMin]:[Esec]}[/Math] > > Now do the same for the current date and time: > > today's date as integer = [Math]Tdate={[date]}[/Math] > > today's time as integer = [Math]Ttime={[time]}[/Math] > > Now subtract one from the other: > elapsed days as integer = [Math]elapsedD=[Tdate] - [Edate][/Math]
> > elapsed time as integer = [Math]elapsedT=[Ttime] - [Etime][/Math] > > To convert back to days, hours, minutes and seconds, use the format tag: >
> [elapsedD] days, [Format Seconds_To_Time %H hours, %M minutes and %S > seconds ago.][elapsedT][/Format] > > > Dave Hurley > Biology Department > University of Washington -- =o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o DONOVAN D. BROOKE Eucalyptus Design <-Web Development (specializing in eCommerce), -> <- Graphic Design, Custom Tags and Labels -> ADDRESS:> Donovan Brooke DBA Eucalyptus Design N2862 Summerville Park Rd. Lodi, WI 53555 PH:> 1.608.592.3567 Web:> http://www.euca.us =o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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Associated Messages, from the most recent to the oldest:
Dave, the problem with this is that if a time was appended that is less than the current time, you have a negative integer. This is why, when dealling with Date and Time down to the seconds, you will always do better with "seconds since epoch". Donovan Dave Hurley wrote: > Since you have your date and time fields separated, you may need to > create dates and times with them. By enclosing the whole thing in {} and > setting it as a math variable, it will be in the form of an integer, > which simplifies any calculations: > > [text]Emon=04[/text] > [text]Eday=20[/text] > [text]Eyr=2005[/text] > > [text]EHr=11[/text] > [text]Emin=45[/text] > [text]Esec=45[/text] > > entered date as integer = [math]Edate={[Emon]/[Eday]/[Eyr]}[/Math] > > entered time as integer = [math]Etime={[EHr]:[EMin]:[Esec]}[/Math] > > Now do the same for the current date and time: > > today's date as integer = [math]Tdate={[date]}[/Math] > > today's time as integer = [math]Ttime={[time]}[/Math] > > Now subtract one from the other: > elapsed days as integer = [math]elapsedD=[Tdate] - [Edate][/Math]
> > elapsed time as integer = [math]elapsedT=[Ttime] - [Etime][/Math] > > To convert back to days, hours, minutes and seconds, use the format tag: >
> [elapsedD] days, [Format Seconds_To_Time %H hours, %M minutes and %S > seconds ago.][elapsedT][/Format] > > > Dave Hurley > Biology Department > University of Washington -- =o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o DONOVAN D. BROOKE Eucalyptus Design <-Web Development (specializing in eCommerce), -> <- Graphic Design, Custom Tags and Labels -> ADDRESS:> Donovan Brooke DBA Eucalyptus Design N2862 Summerville Park Rd. Lodi, WI 53555 PH:> 1.608.592.3567 Web:> http://www.euca.us =o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o=o ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Donovan Brooke
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