seconds to date

[shoba]

hi

i'm provided with time in seconds. this is the time elapsed from the
midnight to jan 1970 till certain date. i would like to know how to
determine that date using this time

thanks in advance

[Karl Heinz Buchegger]

shoba wrote:

hi

i'm provided with time in seconds. this is the time elapsed from the
midnight to jan 1970 till certain date. i would like to know how to
determine that date using this time

a minute has 60 seconds
there are 60 seconds per hour
24 hours make a day
....

--
Karl Heinz Buchegger
kb******@gascad.at

[Peter Gregory]

Karl Heinz Buchegger wrote:

shoba wrote:

hi

i'm provided with time in seconds. this is the time elapsed from the
midnight to jan 1970 till certain date. i would like to know how to
determine that date using this time

a minute has 60 seconds
there are 60 seconds per hour
24 hours make a day
...

but its more complicated with leap-years and century breaks from leap-years.
Search for an algorithm on google, I'm sure you'll find one!

Pete

[Ron Natalie]

"Peter Gregory" <pe***********@durham.ac.uk> wrote in message news:bf**********@sirius.dur.ac.uk...

but its more complicated with leap-years and century breaks from leap-years.
Search for an algorithm on google, I'm sure you'll find one!

Don't forget the leap seconds.

[osmium]

Ron Natalie writes:

Don't forget the leap seconds.

For most purposes that I can think of, I think leap seconds should be
ignored. They are external to our legal system etc. If a bank deposit
was made in the second preceding a leap second, a withdrawal was recorded as
happening either at the same second or the following (civil) second. The
leap second is treated as though it didn't exist except for a few nerds in
Boulder and their time-keeping buddies around the world.

[Ron Natalie]

"osmium" <r1********@comcast.net> wrote in message news:bf************@ID-179017.news.uni-berlin.de...

Ron Natalie writes:

Don't forget the leap seconds.

For most purposes that I can think of, I think leap seconds should be
ignored. They are external to our legal system etc. If a bank deposit
was made in the second preceding a leap second, a withdrawal was recorded as
happening either at the same second or the following (civil) second. The
leap second is treated as though it didn't exist except for a few nerds in
Boulder and their time-keeping buddies around the world.

If you're going to compute time intervals of years down to the second, you want
to do the leap seconds. If you don't care about them, you probably
ought not be using that much precision. Most banks don't do any accounting
in units smaller than a day.

[Peter Gregory]

osmium wrote:

Ron Natalie writes:

Don't forget the leap seconds.

I thought that was a joke at first, later I found leap seconds exist; wow,
I've been missing something special!
For most purposes that I can think of, I think leap seconds should be
ignored.
"Since the first leap second in 1972, all leap seconds have been positive
and there were 22 leap seconds in the 27 years to January, 1999. This
pattern reflects the general slowing trend of the Earth due to tidal
braking."
http://tycho.usno.navy.mil/leapsec.html

You wouldn't want the time to be 22 seconds out though (since it's time
since 1970 we're measuring)
The leap second is treated as though it didn't exist except for a few
nerds in Boulder and their time-keeping buddies around the world.

I'm no buddy to any time-keeper, maybe I should find some! (:

Pete

[Shane Beasley]

sh********@rediffmail.com (shoba) wrote in message news:<ed**************************@posting.google. com>...

i'm provided with time in seconds. this is the time elapsed from the
midnight to jan 1970 till certain date. i would like to know how to
determine that date using this time

<http://dinkumware.com/htm_cpl/time.html>

Store your number of seconds in a time_t variable and pass it to one
of the functions that takes a time_t (or time_t *); then process the
result.

BTW: All C and C++ books should have a section about time functions...
Doesn't yours?

- Shane

[Karl Heinz Buchegger]

Peter Gregory wrote:

Karl Heinz Buchegger wrote:

shoba wrote:

hi

i'm provided with time in seconds. this is the time elapsed from the
midnight to jan 1970 till certain date. i would like to know how to
determine that date using this time

a minute has 60 seconds
there are 60 seconds per hour
24 hours make a day
...

but its more complicated with leap-years and century breaks from leap-years.

Ok. So what? It's still based on simple arithmetic. Depending
on the way the OP solves it exactly, additionaly there *could*
be involved:
arrays (for storing a table containing the number of days per month)
some if's (for determining if there is a leap year)
some loops
arithmetic no more complex then addition, subtraction, multiplication,
division, %

And the whole assignment is a good exercise in comming up with an algorithm.

--
Karl Heinz Buchegger
kb******@gascad.at

[Karl Heinz Buchegger]

osmium wrote:

One bottom line is that cesium is more reliable than the planetary system.

One just needs to accept that in the planetary system the bodies influence
each other :-)

Seriously: If someone thinks that leap seconds are strange, he/she should
look up how many and what time systems astronomers use. For them having
a clock which keeps in perfect sync with the earth rotation is an important
thing.

--
Karl Heinz Buchegger
kb******@gascad.at