From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=0.7 required=5.0 tests=BAYES_00,MSGID_RANDY, T_FILL_THIS_FORM_SHORT autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,cfd23c10fd537a80 X-Google-Attributes: gid103376,public From: Robert Dewar Subject: Re: C date package Date: 2000/05/10 Message-ID: <8fahfv$mgt$1@nnrp1.deja.com> X-Deja-AN: 621384390 References: <39176D85.603D7AEC@research.canon.com.au> <39178DEA.FD2C20FA@research.canon.com.au> <8f92o1$6v$1@nnrp1.deja.com> <3918BB77.693C70D6@research.canon.com.au> X-Http-Proxy: 1.0 x27.deja.com:80 (Squid/1.1.22) for client 205.232.38.14 Organization: Deja.com - Before you buy. X-Article-Creation-Date: Wed May 10 02:28:30 2000 GMT X-MyDeja-Info: XMYDJUIDrobert_dewar Newsgroups: comp.lang.ada X-Http-User-Agent: Mozilla/4.61 [en] (OS/2; I) Date: 2000-05-10T00:00:00+00:00 List-Id: In article <3918BB77.693C70D6@research.canon.com.au>, Geoff Bull wrote: > Oops, I posted to comp.lang.ada by mistake! > This was a thread on team-ada discussing which started with > the "2038 bug". > Fair enough, weak was probably the wrong word (maybe I should > used "basic") > - it doesn't even split out hours and minutes. By the way, have a look at the package GNAT.Calendar in GNAT 3.13 which fills in some of the gaps. In fact let me post the spec here. There is also a GNAT.Calendar.Time_IO that allows flexible output of times -- This package extends Ada.Calendar to handle Hour, Minute, Second, -- Second_Duration and Day_Of_Week and Day_In_Year from Calendar.Time. -- Second_Duration precision depends on the target clock precision. -- -- GNAT.Calendar provides the same kind of abstraction found in -- Ada.Calendar. It provides Split and Time_Of to build and split a Time -- data. And it provides accessor functions to get only one of Hour, Minute, -- Second, Second_Duration. Other functions are to access more advanced -- valueas like Day_Of_Week, Day_In_Year and Week_In_Year. with Ada.Calendar; with Interfaces.C; package GNAT.Calendar is type Day_Name is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday); subtype Hour_Number is Natural range 0 .. 23; subtype Minute_Number is Natural range 0 .. 59; subtype Second_Number is Natural range 0 .. 59; subtype Second_Duration is Ada.Calendar.Day_Duration range 0.0 .. 1.0; subtype Day_In_Year_Number is Positive range 1 .. 366; subtype Week_In_Year_Number is Positive range 1 .. 53; function Hour (Date : Ada.Calendar.Time) return Hour_Number; function Minute (Date : Ada.Calendar.Time) return Minute_Number; function Second (Date : Ada.Calendar.Time) return Second_Number; function Sub_Second (Date : Ada.Calendar.Time) return Second_Duration; -- Hour, Minute, Sedond and Sub_Second returns the complete time data for -- the Date (H:M:S.SS). See Ada.Calendar for Year, Month, Day accessors. -- Second_Duration precision depends on the target clock precision. function Day_Of_Week (Date : Ada.Calendar.Time) return Day_Name; -- Return the day name. function Day_In_Year (Date : Ada.Calendar.Time) return Day_In_Year_Number; -- Returns the day number in the year. (1st January is day 1 and 31st -- December is day 365 or 366 for leap year). function Week_In_Year (Date : Ada.Calendar.Time) return Week_In_Year_Number; -- Returns the week number in the year with Monday as first day of week procedure Split (Date : Ada.Calendar.Time; Year : out Ada.Calendar.Year_Number; Month : out Ada.Calendar.Month_Number; Day : out Ada.Calendar.Day_Number; Hour : out Hour_Number; Minute : out Minute_Number; Second : out Second_Number; Sub_Second : out Second_Duration); -- Split the standard Ada.Calendar.Time data in date data (Year, Month, -- Day) and Time data (Hour, Minute, Second, Sub_Second) function Time_Of (Year : Ada.Calendar.Year_Number; Month : Ada.Calendar.Month_Number; Day : Ada.Calendar.Day_Number; Hour : Hour_Number; Minute : Minute_Number; Second : Second_Number; Sub_Second : Second_Duration := 0.0) return Ada.Calendar.Time; -- Returns an Ada.Calendar.Time data built from the date and time values. -- C timeval conversion -- C timeval represent a duration (used in Select for example). This -- structure is composed of a number of seconds and a number of micro -- seconds. The timeval structure is not exposed here because its -- definition is target dependent. Interface to C programs is done via a -- pointer to timeval structure. type timeval is private; function To_Duration (T : access timeval) return Duration; function To_Timeval (D : Duration) return timeval; private -- This is a dummy declaration that should be the largest possible timeval -- structure of all supported targets. type timeval is array (1 .. 2) of Interfaces.C.long; function Julian_Day (Year : Ada.Calendar.Year_Number; Month : Ada.Calendar.Month_Number; Day : Ada.Calendar.Day_Number) return Integer; -- Compute Julian day number. -- -- The code of this function is a modified version of algorithm -- 199 from the Collected Algorithms of the ACM. -- The author of algorithm 199 is Robert G. Tantzen. end GNAT.Calendar; -- This package augments standard Ada.Text_IO with facilities for input -- and output of time values in standardized format. package GNAT.Calendar.Time_IO is Picture_Error : exception; type Picture_String is new String; -- This is a string to describe date and time output format. The string is -- a set of standard character and special tag that are replaced by the -- corresponding values. It follows the GNU Date specification. Here are -- the recognized directives : -- -- % a literal % -- n a newline -- t a horizontal tab -- -- Time fields: -- -- %H hour (00..23) -- %I hour (01..12) -- %k hour ( 0..23) -- %l hour ( 1..12) -- %M minute (00..59) -- %p locale's AM or PM -- %r time, 12-hour (hh:mm:ss [AP]M) -- %s seconds since 1970-01-01 00:00:00 UTC -- (a nonstandard extension) -- %S second (00..59) -- %T time, 24-hour (hh:mm:ss) -- -- Date fields: -- -- %a locale's abbreviated weekday name (Sun..Sat) -- %A locale's full weekday name, variable length -- (Sunday..Saturday) -- %b locale's abbreviated month name (Jan..Dec) -- %B locale's full month name, variable length -- (January..December) -- %c locale's date and time (Sat Nov 04 12:02:33 EST 1989) -- %d day of month (01..31) -- %D date (mm/dd/yy) -- %h same as %b -- %j day of year (001..366) -- %m month (01..12) -- %U week number of year with Sunday as first day of week -- (00..53) -- %w day of week (0..6) with 0 corresponding to Sunday -- %W week number of year with Monday as first day of week -- (00..53) -- %x locale's date representation (mm/dd/yy) -- %y last two digits of year (00..99) -- %Y year (1970...) -- -- By default, date pads numeric fields with zeroes. GNU date -- recognizes the following nonstandard numeric modifiers: -- -- - (hyphen) do not pad the field -- _ (underscore) pad the field with spaces ISO_Date : constant Picture_String; US_Date : constant Picture_String; European_Date : constant Picture_String; function Image (Date : Ada.Calendar.Time; Picture : Picture_String) return String; -- Return Date as a string with format Picture. -- raise Picture_Error if picture string is wrong procedure Put_Time (Date : Ada.Calendar.Time; Picture : Picture_String); -- Put Date with format Picture. -- raise Picture_Error if picture string is wrong private ISO_Date : constant Picture_String := "%Y/%m/%d"; US_Date : constant Picture_String := "%m/%d/%y"; European_Date : constant Picture_String := "%d/%m/%y"; end GNAT.Calendar.Time_IO; Sent via Deja.com http://www.deja.com/ Before you buy.