![]() This formatting is best explained by the example code. The Formatting string can comprise a mix of ordinary characters (that are passed unchanged to the result string), and data formatting characters. Formatting is defined by the Formatting string. These functions do allow for specifying manual offsets against UTC, but then you would need to keep track of those offsets - which PascalTZ does for you. The FormatDateTime function provides rich formatting of a TDateTime value DateTime into a string. the functions use current daylight saving time etc to convert to/from UTC time). This means the fractional part of a day (hours, minutes, etc.) is dropped. These functions can be useful and an alternative for PascalTZ if you are not interested in historical/future date/times (i.e. DaysBetween returns the number of whole days between ANow and AThen. Since 2.6.2, FPC has the functions LocalTimeToUniversal and UniversalTimeToLocal in the dateutils unit to convert between local time and UTC time. Could you not just subtract one from the other (assuming the Time part was zeroed) Ken Pemberton. Modified LGPL (same as the FPC RTL and the Lazarus LCL).īug reports and suggestions can be logged at GitHub:PascalTZ issues. This library was originally published by José Mejuto in 2009 and is maintained by Denis Kozlov since 2015. TimeZoneExists ( 'Australia/Darwin' )) PascalTZ. Or, you can create a record: type dater Record month: byte day : byte year: integer End var mydate: dater Thus, knowing the format ( mm.dd.yyyy) you can easily validate it. Date1 : Date2 : Result would be: 0 years, 0 moths, 11 days I tried to do it on my own, but without success. If you're using Turbo Pascal, then the only thing you can do is check the string character by character. TimeZoneExists ( 'Africa/Lagos' )) WriteLn ( 'Australia/Darwin exists? ', PascalTZ. i'm searching a pascal datetime function that simulates an Excel function: 'DateDif' Excel for example knows the function DateDif that returns the number of Years, month and days between Date1 and date2. Convert ( DateTime, 'Europe/Paris', 'America/Chicago' ) WriteLn ( 'Time in Chicago: ', DateTimeToStr ( DateTime )) // Check if a time zone exists WriteLn ( 'Africa/Lagos exists? ', PascalTZ. GMTToLocalTime ( DateTime, 'Europe/Paris' ) WriteLn ( 'Time in Paris: ', DateTimeToStr ( DateTime )) // Convert Paris time to Chicago time DateTime := PascalTZ. DatabasePath := 'tzdata' // Current local and UTC time DateTime := Now WriteLn ( 'Local time: ', DateTimeToStr ( DateTime )) DateTime := LocalTimeToUniversal ( DateTime ) WriteLn ( 'UTC time: ', DateTimeToStr ( DateTime )) // Convert current time to Paris time DateTime := PascalTZ. Declaration: Procedure PackTime (var T: datetime var P: longint). The fractional part reflects the fraction of a 24-hour day without regard to the sign of the TDateTime. Reference guide for standard Free Pascal units. The integer part is the number of days that have passed since December 30, 1899, and can be a negative number. data sources and axis transformations) are implemented via separate components instead of through simple chart properties. One substantial difference is that some features (e.g. ![]() It is comparable in features, but not specifically compatible, with Delphi's TeeChart package. It is printed in 2 volumes with a total of 935 pages. TAChart is a package for drawing graphs, charts and other diagrams. Create // Load time zone database from "tzdata" directory // Download from: PascalTZ. TDateTime is stored as a double, the integer part representing days and the fractional part being fraction of a day. The Free Pascal and Lazarus foundation will receive 50 of the profits The book is all about Lazarus and FPC necessities. Uses SysUtils, DateUtils, uPascalTZ var PascalTZ : TPascalTZ DateTime : TDateTime begin PascalTZ := TPascalTZ. Program RFC1123_TimeFormat uses SysUtils, DateUtils function RFC1123TimeFormat ( aDateTime : TDateTime isLocalTime : boolean ) : string const ShortDayNamesEnglish : array of string = ( 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat' ) ShortMonthNamesEnglish : array of string = ( 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ) var day, month : string someDateTime : TDateTime begin if isLocalTime then someDateTime := LocalTimeToUniversal ( aDateTime ) else someDateTime := aDateTime day := ShortDayNamesEnglish month := ShortMonthNamesEnglish result := day + ', ' + FormatDateTime ( 'dd', someDateTime ) + ' ' + month + ' ' + FormatDateTime ( 'yyyy hh:nn:ss', someDateTime ) + ' GMT' end var someDate : TDateTime begin someDate := EncodeDate ( 2018, 10, 23 ) WriteLn ( RFC1123TimeFormat ( now, true )) WriteLn ( RFC1123TimeFormat ( someDate, false )) ReadLn end.
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