How do I mask out all but the _time_ components of a time_t value?
Specifically, I have the following:
time_t wTime = 1226764757;
I happen to know that this is November 16, 2008 @ 8:59:17, but I have
many other such items from which I want to use only the _time_ portion
(e.g. 8:59:17). How do I eliminate the "date" portions of either the
time_t value or the number I assign to it? TIA 4 3506
On Nov 20, 8:03*am, mrc2...@cox.net (Mike Copeland) wrote:
* *How do I mask out all but the _time_ components of a time_t value?*
Specifically, I have the following:
* * * * time_t wTime = 1226764757;
* *I happen to know that this is November 16, 2008 @ 8:59:17, but I have
many other such items from which I want to use only the _time_ portion
(e.g. 8:59:17). *How do I eliminate the "date" portions of either the
time_t value or the number I assign to it? *TIA
Is number of seconds since midnight what you want? time(0) % 86400?
m.
On 2008-11-20 02:03:33 -0500, mr*****@cox.net (Mike Copeland) said:
How do I mask out all but the _time_ components of a time_t value?
Specifically, I have the following:
time_t wTime = 1226764757;
I happen to know that this is November 16, 2008 @ 8:59:17, but I have
many other such items from which I want to use only the _time_ portion
(e.g. 8:59:17). How do I eliminate the "date" portions of either the
time_t value or the number I assign to it? TIA
Use gmtime() or localtime() to convert it to a tm.
--
Pete
Roundhouse Consulting, Ltd. ( www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
( www.petebecker.com/tr1book)
On 2008-11-20 02:56:08 -0500, "miso.lipta k" <mi*********@gm ail.comsaid:
On Nov 20, 8:03Â*am, mrc2...@cox.net (Mike Copeland) wrote:
>Â* Â*How do I mask out all but the _time_ components of a time_t value?
Â*
>Specifically , I have the following: Â* Â* Â* Â* time_t wTime = 1226764757; Â* Â*I happen to know that this is November 16, 2008 @ 8:59:17, but I h
ave
>many other such items from which I want to use only the _time_ portion (e.g. 8:59:17). Â*How do I eliminate the "date" portions of either the time_t value or the number I assign to it? Â*TIA
Is number of seconds since midnight what you want? time(0) % 86400?
m.
The requirement (from the C standard) is that time_t is an "arithmetic
type capable of representing times ...". That's all. It doesn't have to
represent seconds, nor does it have to be based on midnight.
--
Pete
Roundhouse Consulting, Ltd. ( www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
( www.petebecker.com/tr1book)
On Nov 20, 8:56 am, "miso.lipta k" <miso.lip...@gm ail.comwrote:
On Nov 20, 8:03 am, mrc2...@cox.net (Mike Copeland) wrote:
How do I mask out all but the _time_ components of a time_t
value? Specifically, I have the following:
time_t wTime = 1226764757;
I happen to know that this is November 16, 2008 @ 8:59:17,
but I have many other such items from which I want to use
only the _time_ portion (e.g. 8:59:17). How do I eliminate
the "date" portions of either the time_t value or the number
I assign to it? TIA
Is number of seconds since midnight what you want? time(0) %
86400?
That depends on how precise and how portable you have to be.
Not all days have exactly 86400 seconds, and time_t can be any
numeric type, with any representation---if it uses the
representation that was current in MS-DOS, your results are
meaningless, and if it is a double, your solution won't even
compile. (But for a lot of uses, it's adequate. It's what I
currently do---but in my case, even if I'm a minute or so off,
it's no big deal, and I only have to support
Unix-likes---Solaris and Linux.)
--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: a_geek |
last post by:
Hello,
I'm writing a small program that needs to check Unix timestamps for
falling into an interval (typical usage: ./program 2005-03, you get
the idea). Now, I create two time stamps from the user's input to
create the interval's borders using mktime(). Trying to check the sanity
of my program, I also converted the values back to tuples using
localtime(). Unfortunately, I get back one of them with the DST flag
set, and the other with...
|
by: New Guy |
last post by:
Hello,
First, I want to apologize for posting this message to multiple
groups. (1) I have a hard time finding any info and (2) this is not a
school assignment.
I am trying to create in my Oracle test database a "time" table that
would have time buckets. What I mean is that, it would have some
structure like this
|
by: PK9 |
last post by:
I have a string variable that holds the equivalent of a DateTime value. I
pulled this datetime from the database and I want to strip off the time
portion before displaying to the user.
I am using C#
eg.
- String variable "strMyDate" holds the value "1/1/2005 12:00:00 AM" from
the database.
- I do not care about the time portion, I only want "1/1/2005" for display.
|
by: rnn98 |
last post by:
hi,
my multithread application, running under solaris box, is crashing
eventually.
I tried to spot and substitute functions not "thread safe", but I
guess my search wasn't good enough. I have put localtime_r and
asctime_r where I was using localtime and asctime. But I didn't find
any correspondent _r function to "time".Also, I found that "readdir"
is not thread safe. But what about "scandir"?
Thanks for any help
|
by: Reney |
last post by:
I am using Access Database in my program. The column in the table that I am
going to use has date/time value with Medium Time selected. (HH:mm). The
program is recording a clock in time to this field, which is the time when
the entry is made. If you check the database, it shows the correct time in
the correct format. But when you are calling it with a dataset and showing
with a datagrid, it doesn't show the time value but it always shows...
| |
by: Micah Williamson |
last post by:
Does anyone know how to make it so that a time entered
as a string, and stored in a string record in an access
2000 database can be kept as a string?
When ever I enter a time like 1:00:00 PM into a bound text
box, then I update the access database, the value changes
to a date with time attached. Access then takes the time
portion away, and only leaves the date.
The dataset recognizes the field in the database as text,
|
by: teddysnips |
last post by:
One of my clients has asked me to make a change to one of their Access
applications.
The application is a Front End/Back End standard app. I didn't
develop it, but looking at it tells me that it was done entirely using
the Wizards. There is no log-in procedure.
They want to amend it so that only one person can be logged in at any
one time. So, if Joe Bloggs tries to open the application, and Fred
Jones has already connected, Joe...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
| |
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |