BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  What is the Best Way to calculate hours differents?          BorlandTalk.com Forum Index -> C++ Builder (Language C++) View previous topic :: View next topic   Author Message Only me Guest Posted: Thu Dec 07, 2006 2:52 pm    Post subject: What is the Best Way to calculate hours differents? Hi, I have the current time, for example 22:45, and I want that the program will calculate the time in another country where the time is +5:30 hours relative to my time. or, my current time is 2:35 in the morning, and I want to know what is the time in a place where the relative time is -7:15 hours comparing to my time. How can I calculete it? a piece of code will be nice :-) Thanks! Back to top Hans Galema Guest Posted: Thu Dec 07, 2006 5:24 pm    Post subject: Re: What is the Best Way to calculate hours differents? Only me wrote: Quote: Hi, I have the current time, for example 22:45, and I want that the program will calculate the time in another country where the time is +5:30 hours relative to my time. For which countrys on earth the time differs other than multiples of hours? +5.00 is possible. Or +6:00. I never saw something like +5:30. Hans. Back to top Alan Bellingham Guest Posted: Thu Dec 07, 2006 5:50 pm    Post subject: Re: What is the Best Way to calculate hours differents? Hans Galema <notused (AT) notused (DOT) nl> wrote: Quote: Only me wrote: Hi, I have the current time, for example 22:45, and I want that the program will calculate the time in another country where the time is +5:30 hours relative to my time. For which countrys on earth the time differs other than multiples of hours? Oh, a few. India is on +5:30, Burma on +6:30, Central Australia on +9:30 Quote: +5.00 is possible. Or +6:00. I never saw something like +5:30. How about the Chatham Islands - +12:45! (And no, not -11:15, they're on the same day as New Zealand just to the west.) Similarly, the Line Islands, at +14 rather than -10. Alan Bellingham -- ACCU Conference: 11-14 April 2007 - Paramount Oxford Hotel Back to top Only me Guest Posted: Thu Dec 07, 2006 6:02 pm    Post subject: Re: What is the Best Way to calculate hours differents? Quote: You can assign both date-time and the timedifference to a TDateTime instance and then subtract them to get the new date-time. Thanks Hans, can you please just give me the name of the commands that I need? Thanks Only me. Back to top Thorsten Kettner Guest Posted: Thu Dec 07, 2006 6:30 pm    Post subject: Re: What is the Best Way to calculate hours differents? "Only me" <MeOnly (AT) mail (DOT) com> wrote: Quote: Hi, I have the current time, for example 22:45, and I want that the program will calculate the time in another country where the time is +5:30 hours relative to my time. or, my current time is 2:35 in the morning, and I want to know what is the time in a place where the relative time is -7:15 hours comparing to my time. How can I calculete it? a piece of code will be nice :-) Thanks! You can add fractions of a day to a TDateTime: #include <SysUtils.hpp> TDateTime RightNow = Now(); TDateTime NowPlusFiveAndAHalf = RightNow + 5.5 / 24.0; ShowMessage(NowPlusFiveAndAHalf.TimeString()); Back to top Hans Galema Guest Posted: Thu Dec 07, 2006 6:40 pm    Post subject: Re: What is the Best Way to calculate hours differents? Alan Bellingham wrote: Quote: Oh, a few. Na. What a world! Thanks for pointing out. Learned again something. And for the question: You can assign both date-time and the timedifference to a TDateTime instance and then subtract them to get the new date-time. Hans. Back to top MeOnly Guest Posted: Thu Dec 07, 2006 7:06 pm    Post subject: Re: What is the Best Way to calculate hours differents? Quote: If you're interested in something portable, you can look at boost date_time libs. http://boost.org/doc/html/date_time/examples.html#date_time.examples.time_math Na... IT looks too much complicate.... but Thanks. Back to top Me Only Guest Posted: Thu Dec 07, 2006 7:07 pm    Post subject: Re: What is the Best Way to calculate hours differents? Quote: You can add fractions of a day to a TDateTime: #include <SysUtils.hpp TDateTime RightNow = Now(); TDateTime NowPlusFiveAndAHalf = RightNow + 5.5 / 24.0; ShowMessage(NowPlusFiveAndAHalf.TimeString()); Thanks! Back to top Alan Bellingham Guest Posted: Thu Dec 07, 2006 7:45 pm    Post subject: Re: What is the Best Way to calculate hours differents? Hans Galema <notused (AT) notused (DOT) nl> wrote: Quote: Alan Bellingham wrote: Oh, a few. Na. What a world! Wikipedia is your friend. It has a truly mind-boggling map of time zones, and you'll find the most amazing mess in the mid Pacific. Alan Bellingham -- ACCU Conference: 11-14 April 2007 - Paramount Oxford Hotel Back to top Duane Hebert Guest Posted: Thu Dec 07, 2006 7:53 pm    Post subject: Re: What is the Best Way to calculate hours differents? "Only me" <MeOnly (AT) mail (DOT) com> wrote in message news:4577e458$1 (AT) newsgroups (DOT) borland.com... Quote: Hi, I have the current time, for example 22:45, and I want that the program will calculate the time in another country where the time is +5:30 hours relative to my time. or, my current time is 2:35 in the morning, and I want to know what is the time in a place where the relative time is -7:15 hours comparing to my time. How can I calculete it? a piece of code will be nice If you're interested in something portable, you can look at boost date_time libs. http://boost.org/doc/html/date_time/examples.html#date_time.examples.time_math Back to top Thomas Maeder [TeamB] Guest Posted: Thu Dec 07, 2006 10:30 pm    Post subject: Re: What is the Best Way to calculate hours differents? Alan Bellingham <alan (AT) lspace (DOT) org> writes: Quote: For which countrys on earth the time differs other than multiples of hours? Oh, a few. India is on +5:30, Burma on +6:30, Central Australia on +9:30 Not to forget Newfoundland. http://www.timetemperature.com/tzca/newfoundland_time_zone.shtml Back to top Nate Guest Posted: Sat Dec 09, 2006 8:33 am    Post subject: Re: What is the Best Way to calculate hours differents? Thomas Maeder [TeamB] wrote: Quote: Not to forget Newfoundland. http://www.timetemperature.com/tzca/newfoundland_time_zone.shtml I would *never* do that! In fact it was my first thought. Of course you could convert to UTC (GMT) and then convert to the target. 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