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devel / comp.lang.xharbour / Date + one year

SubjectAuthor
* Date + one yearOtto Haldi
`* Date + one yearRobert Campsmith
 `* Date + one yeardlzc
  `- Date + one yearRobert Campsmith

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Date + one year

<2afd9695-c269-413d-bc84-197f2094ab62n@googlegroups.com>

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Subject: Date + one year
From: otto.hal...@gmail.com (Otto Haldi)
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 by: Otto Haldi - Mon, 31 Oct 2022 14:29 UTC

Hello,
What is the easiest way to add a year to a date?
If I do Date()+365, I will have an error with bisexual years.

Re: Date + one year

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From: drrob...@sturec.com (Robert Campsmith)
Newsgroups: comp.lang.xharbour
Subject: Re: Date + one year
Date: Mon, 7 Nov 2022 14:05:37 -0500
Organization: Aioe.org NNTP Server
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 by: Robert Campsmith - Mon, 7 Nov 2022 19:05 UTC

I use...

LOCAL nDaysInYear := 365.25

dNewYear := dOldYear + nDaysInYear

To calculate someone's age

nAge := INT( ( dDob - dTargetDate ) / nDaysInYear )

Good Luck,
-- Robert

On 10/31/2022 10:29 AM, Otto Haldi wrote:
> Hello,
> What is the easiest way to add a year to a date?
> If I do Date()+365, I will have an error with bisexual years.

Re: Date + one year

<32380e44-4e68-4d31-b406-a186538c30fan@googlegroups.com>

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Subject: Re: Date + one year
From: dlz...@cox.net (dlzc)
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 by: dlzc - Tue, 8 Nov 2022 15:14 UTC

On Monday, November 7, 2022 at 12:05:40 PM UTC-7, Robert wrote:
> I use...
>
>
> LOCAL nDaysInYear := 365.25
>
> dNewYear := dOldYear + nDaysInYear
>
> To calculate someone's age
>
> nAge := INT( ( dDob - dTargetDate ) / nDaysInYear )

Fails when the dates surround 1900, or 2100, but good enough over YOUR lifetime. And it is the reverse of what is being asked for. Likely also fail near February 28 - March 1 more often than you'd like.

David A. Smith

Re: Date + one year

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From: drrob...@sturec.com (Robert Campsmith)
Newsgroups: comp.lang.xharbour
Subject: Re: Date + one year
Date: Tue, 15 Nov 2022 14:29:26 -0500
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 by: Robert Campsmith - Tue, 15 Nov 2022 19:29 UTC

Thanks David,

As I may have mentioned, I use this to calculate someone's age as of a
certain date. Not calculating the orbit to Mars. Just thought it might
be a useful shortcut. You are correct in that to calculate EXACTLY one
year you must go thorough all the what-if tests.

-- Robert

On 11/8/2022 10:14 AM, dlzc wrote:
> On Monday, November 7, 2022 at 12:05:40 PM UTC-7, Robert wrote:
>> I use...
>>
>>
>> LOCAL nDaysInYear := 365.25
>>
>> dNewYear := dOldYear + nDaysInYear
>>
>> To calculate someone's age
>>
>> nAge := INT( ( dDob - dTargetDate ) / nDaysInYear )
>
> Fails when the dates surround 1900, or 2100, but good enough over YOUR lifetime. And it is the reverse of what is being asked for. Likely also fail near February 28 - March 1 more often than you'd like.
>
> David A. Smith

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