Calculate difference in dates

[Frank]

For my website i would like to display the age of my son in years,
months, days and hours.

For now i manage to get a result for totals. Like the total number of
days.

This is the beginning:

starttime = Date.parse("Aug 10,2003, 07:07")
sdt = new Date(starttime)
starttime= Math.ceil((star ttime) / 1000 / 60 / 60 / 24 )
ndt = new Date()

y = sdt.getYear()
m = sdt.getMonth() + 1
d = sdt.getDate()
h = starttime

Thanx

[Dr John Stockton]

JRS: In article <opsdj5hefsx13k vk@atlantis>, dated Mon, 30 Aug 2004
18:22:38, seen in news:comp.lang. javascript, Michael Winter <M.Winter@bl
ueyonder.co.inv alid> posted :

On Mon, 30 Aug 2004 17:19:23 +0100, Dr John Stockton
<sp**@merlyn.d emon.co.uk> wrote:

JRS: In article <opsdh37io1x13k vk@atlantis>, dated Sun, 29 Aug 2004
16:01:43, seen in news:comp.lang. javascript, Michael Winter
<M.******@bluey onder.co.invali d> posted :

On 29 Aug 2004 08:18:46 -0700, Frank <fa*****@hotmai l.com> wrote:
[snip]
starttime = Date.parse("Aug 10,2003, 07:07")

It would be safer to use numbers, rather than a string as there is no
exact definition for string date formats. I'm certain that the format
above will cause problems in some browsers.

Can anyone provide an actual example of failure? ISTM worth settling
the point of whether all javascript systems, however configured, can
read a date with English-MON DD YYYY in arbitrary order and
reasonable punctuation.

Would it be possible? As there is no definition on what should result, or
be accepted, in any of the string-related methods, it would be up to the
developers to decide what should be a reasonable format. That said, I
agree: it would be nice to know.

Certainly it would be possible. The three-letter abbreviation must be
the month; ignoring case, jan..dec, all else being an error. The four
digits must be the year, so the other field the day.

There is the question of what punctuation is reasonable; in mine, f,eb
gives NaN, but fe,b is OK (and GMT+2); an isolatable letter appears to
be taken as offset (j excluded).

My MSIE4 system accepts
Feb 3 2222 YES
Feb 3st 2222 NO
Feb 3nd 2222 NO
Feb 3rd 2222 NO
Feb 3th 2222 YES
where the last two are alarming.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demo n.co.uk/> - w. FAQish topics, links, acronyms
PAS EXE etc : <URL:http://www.merlyn.demo n.co.uk/programs/> - see 00index.htm
Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.

[Dr John Stockton]

JRS: In article <14************ *************** *****@4ax.com>, dated
Mon, 6 Sep 2004 06:22:12, seen in news:comp.lang. javascript, Otter
<Ot***@nospam.n et> posted :

On 29 Aug 2004 08:18:46 -0700, fa*****@hotmail .com (Frank) wrote:

For my website i would like to display the age of my son in years,
months, days and hours.

Frank - if you ever get/got this to work could you please post the
code? I've been looking to do the exact same thing for a good two
years now. Every once in a while I seach the net for code but the
best I can find only gives total number of days, months, etc (ie: 30
months, 919 days, etc). In fact this is the very reason I'm reading
this group now!

Evertjan wrote :-

Read the faq:

<http://www.merlyn.demo n.co.uk/js-date0.htm#DC>
and
<http://www.merlyn.demo n.co.uk/js-date1.htm#diff>

but perhaps he missed
<URL:http://www.merlyn.demo n.co.uk/js-dates.htm#Intro > !

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

[Dr John Stockton]

JRS: In article <BD************ ***********@btc lick.com>, dated Mon, 6
Sep 2004 15:46:19, seen in news:comp.lang. javascript, Ian Sedwell
<ia*********@bt click.com> posted :

This won't immediately solve your problems, but it will go a long way to
showing you what's involved. Anyway, it's more fun to do some of the work
yourselves :-)
It seems rather a pointless contribution. Did you write it yourself?

Code posted in News should not be allowed to be line-wrapped by the
posting software; the poster should wrap it by hand himself. Or
herself.
// This function returns the time in 12-hour clock format.
A silly thing to do.

// Mos people using this site are not likely to be familiar with the 24-hour
clock,
Most people here know it well; even the Americans.

function showTheHour (theHour) {
if ((theHour > 0) && (theHour < 13)) {
return theHour;
}
else {
if (theHour == 0) {
return theHour;
}
else {
return (theHour - 12);
}
}
}
ISTM that the above code does not do the customary thing for the first
hour of the day; but I've not run the code.

On 2004/09/06 12:22, in article 14************* *************** ****@4ax.com,
"Otter" <Ot***@nospam.n et> wrote:

Responses should go after trimmed quotes.

Carefully reading a newsgroup FAQ before posting to the group is
strongly recommended; anyone who posts an answer palpably inferior to
one indicated by the FAQ is liable to be considered, and described as,
injudicious.

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demo n.co.uk/> - FAQish topics, acronyms, & links.
Proper <= 4-line sig. separator as above, a line exactly "-- " (SonOfRFC1036)
Do not Mail News to me. Before a reply, quote with ">" or "> " (SonOfRFC1036)

[Ian Sedwell]

On 2004/09/06 20:56, in article Yl************* *@merlyn.demon. co.uk, "Dr
John Stockton" <sp**@merlyn.de mon.co.uk> wrote:

JRS: In article <BD************ ***********@btc lick.com>, dated Mon, 6
Sep 2004 15:46:19, seen in news:comp.lang. javascript, Ian Sedwell
<ia*********@bt click.com> posted :

This won't immediately solve your problems, but it will go a long way to
showing you what's involved. Anyway, it's more fun to do some of the work
yourselves :-)
It seems rather a pointless contribution. Did you write it yourself?

Yes I did.
Code posted in News should not be allowed to be line-wrapped by the
posting software; the poster should wrap it by hand himself. Or
herself.

// This function returns the time in 12-hour clock format.
A silly thing to do.

Please explain that to my client and everyone else who prefers the 12-hour
clock. I prefer the 24-hour clock personally, but then I had it drummed into
my head during flying training.

// Mos people using this site are not likely to be familiar with the 24-hour
clock,
Most people here know it well; even the Americans.

Why should we expect the Americans to have an inferior intelligence?

function showTheHour (theHour) {
if ((theHour > 0) && (theHour < 13)) {
return theHour;
}
else {
if (theHour == 0) {
return theHour;
}
else {
return (theHour - 12);
}
}
}
ISTM that the above code does not do the customary thing for the first
hour of the day; but I've not run the code.

It works very well.

On 2004/09/06 12:22, in article 14************* *************** ****@4ax.com,
"Otter" <Ot***@nospam.n et> wrote:

Responses should go after trimmed quotes.

Carefully reading a newsgroup FAQ before posting to the group is
strongly recommended; anyone who posts an answer palpably inferior to
one indicated by the FAQ is liable to be considered, and described as,
injudicious.

I hope that no one ever describes you as an arrogant toe-rag. That would be
palpably injudicious.

[Mick White]

Ian Sedwell wrote:

function showTheHour (theHour) {
if ((theHour > 0) && (theHour < 13)) {
return theHour;
}
else {
if (theHour == 0) {
return theHour;
}
else {
return (theHour - 12);
}
}
}

function showTheHour (theHour){
return theHour==0?12:t heHour<13?theHo ur:theHour-12;
}

If "theHour" is 0, then it is "12" am, no?
Mick
ISTM that the above code does not do the customary thing for the first
hour of the day; but I've not run the code.

It works very well.

On 2004/09/06 12:22, in article 14************* *************** ****@4ax.com,
"Otter" <Ot***@nospam.n et> wrote:

Responses should go after trimmed quotes.

Carefully reading a newsgroup FAQ before posting to the group is
strongly recommended; anyone who posts an answer palpably inferior to
one indicated by the FAQ is liable to be considered, and described as,
injudicious .

I hope that no one ever describes you as an arrogant toe-rag. That would be
palpably injudicious.

[Lee]

Otter said:

On 29 Aug 2004 08:18:46 -0700, fa*****@hotmail .com (Frank) wrote:

For my website i would like to display the age of my son in years,
months, days and hours.

Frank - if you ever get/got this to work could you please post the
code? I've been looking to do the exact same thing for a good two
years now. Every once in a while I seach the net for code but the
best I can find only gives total number of days, months, etc (ie: 30
months, 919 days, etc).

It's tough to find because it's not a reasonable way to
measure time.

The length of "three months" can vary by up to three days,
depending on where that period happens to fall in the
calendar year.

If you want to measure time in months, you shouldn't try
to do so in precision greater than half a month.

[Otter]

On Mon, 06 Sep 2004 15:09:43 -0500, Kent Feiler <zz**@zzzz.co m> wrote:

http://users.stans.net/kfeiler/stuff/clocks/clocks.htm

It's not exactly what you want, but it's close.

Thanks for that.

Back when I first tried looking for a solution I found a countdown
timer which I used, then modified after the birth to start counting up
(i literally dont know anything about javascript but was able to
figure out enough to make the necessary changes). The only problem is
that it only counts up in terms of days.

I've since replaced the code with a much more streamlined day counter.

I've looked high and low for a javascript counter which can break down
to years/month/days since an event happened but I have yet to find
one. I am assuming now that it can't be done otherwise I'm sure I
would have come across one by now. Found lots of unanswered requests
for the same by others.

I HAVE seen one in cgi-bin but I know even less about that, and I
don't think my service provider allows their use anyway.
http://www.muquit.com/muquit/softwar...2.6/Count.html

An example of what I'm trying to accomplish appears as the last item
here:
http://www.muquit.com/muquit/softwar.../examples.html

Maybe I'll have to start investigating this option.

-Otter

[Lasse Reichstein Nielsen]

Mick White <mw******@BOGUS rochester.rr.co m> writes:

function showTheHour (theHour){
return theHour==0?12:t heHour<13?theHo ur:theHour-12;
}

Then you could also do:

return ((theHour - 1) % 12) + 1;

which is shorter, although not necessarily faster :)

(Please trim your quotes)
/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

[Dr John Stockton]

JRS: In article <BD************ ***********@btc lick.com>, dated Mon, 6
Sep 2004 23:38:44, seen in news:comp.lang. javascript, Ian Sedwell
<ia*********@bt click.com> posted :

On 2004/09/06 20:56, in article Yl************* *@merlyn.demon. co.uk, "Dr
John Stockton" <sp**@merlyn.de mon.co.uk> wrote:

JRS: In article <BD624545.CDE5% ia*********@btc lick.com>, dated Mon, 6
Sep 2004 15:46:19, seen in news:comp.lang. javascript, Ian Sedwell
<ia*********@bt click.com> posted :

This won't immediately solve your problems, but it will go a long way to
showing you what's involved. Anyway, it's more fun to do some of the work
yourselves :-)

It seems rather a pointless contribution. Did you write it yourself?

Yes I did.

You would have done better to read, with care, the newsgroup FAQ
instead.

// Mos people using this site are not likely to be familiar with the 24-hour
clock,

Most people here know it well; even the Americans.

Why should we expect the Americans to have an inferior intelligence?

Familiarity and intelligence are different concepts. President Bush may
or may not be of similar intelligence to President Putin; but he is
undoubtedly far less familiar with the Russian language. Pres.P is
probably less familiar with the New York Subways - though, given their
backgrounds, one should not be too sure of that.

function showTheHour (theHour) {
if ((theHour > 0) && (theHour < 13)) {
return theHour;
}
else {
if (theHour == 0) {
return theHour;
}
else {
return (theHour - 12);
}
}
}

ISTM that the above code does not do the customary thing for the first
hour of the day; but I've not run the code.

It works very well.

Perhaps what it should give and what you think it should give are not
the same. I don't think that it gives what I think that it should give.

The code would not be needed if the 24-hour clock was used.

H12 = LZ(1+(H24+11)%1 2)+ [' am', ' pm'][+(H24>11)]

--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

[Mick White]

Lasse Reichstein Nielsen wrote:

Mick White <mw******@BOGUS rochester.rr.co m> writes:

function showTheHour (theHour){
return theHour==0?12:t heHour<13?theHo ur:theHour-12;
}

Then you could also do:

return ((theHour - 1) % 12) + 1;

Yes, you could, but it would be wrong. What if theHour is 0 (zero)?
Mick