Hora en un dbgrid

ronalg · #8 22-12-2005

Supongo que para meter datos al campo del tipo DATE haces algo asi:

Código Delphi [-]table.insert;
table.fieldbyname('hora').value:=Now;
o
table.fieldbyname('hora').value:=date();
o
table.fieldbyname('hora').value:=today();
o
table.fieldbyname('hora').value:=time;
o
//si estas usando un componente calendario
table.fieldbyname('hora').value:=calendario.date;
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table.post

todos estos (now, date(), today(), time) contiene valores del tipo TDateTime que esta definido asi:

Código Delphi [-]type TDateTime = type Double;

Cita:

Description

Most VCL objects represent date and time values using the TDateTime type. The integral part of a TDateTime value is the number of days that have passed since 12/30/1899. The fractional part of a TDateTime value is fraction of a 24 hour day that has elapsed.

Following are some examples of TDateTime values and their corresponding dates and times:

0 12/30/1899 12:00 am
2.75 1/1/1900 6:00 pm
-1.25 12/29/1899 6:00 am
35065 1/1/1996 12:00 am
To find the fractional number of days between two dates, simply subtract the two values, unless one of the TDateTime values is negative. Similarly, to increment a date and time value by a certain fractional number of days, add the fractional number to the date and time value if the TDateTime value is positive.
When working with negative TDateTime values, computations must handle time portion separately. The fractional part reflects the fraction of a 24-hour day without regard to the sign of the TDateTime value. For example, 6:00 am on 12/29/1899 is –1.25, not –1 + 0.25, which would be –0.75. There are no TDateTime values between –1 and 0.

osea que contiene si o si la fecha y la hora siempre.

para sacar solo la hora sin la fecha debes hacer uso de DATEOF y para sacar solo la hora de TIMEOF, estas funciones estan en la unidad "DateUtils" que debes ponerla a mano en el USES de tu unidad.

Código Delphi [-]table.insert;
table.fieldbyname('hora').value:=timeof(Now);
o
table.fieldbyname('hora').value:=timeof(date());
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table.fieldbyname('hora').value:=timeof(today());
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table.fieldbyname('hora').value:=timeof(time);
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table.post

Esto extraera solo la hora.

espero te sirva