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Comparing my Table Date, Time fields with System Date&Time.

Posted on 2002-07-25
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Last Modified: 2010-04-04
My Dbase Table have fields 'ST_TIME' Character (10) for Time and 'ST_DATE' Date(8) field for Date. I am using these field to save System Input Time and Date from my application.
I have a calculation in my logic to compare this table 'ST_DATE, 'ST_TIME' with the system present Date&Time. If the difference is more than 48 hours I have some logic to do(like closing the record).
 So how can I compare that table 'ST_DATE', 'ST_TIME' with system present Date&Time to find 48 hours difference.
My Table is saving time like :- 11:56:32PM
                   date like :- 25/07/2002

 Please help me to calculate/compare 48 hours time difference. For ex.if do
(Table.FieldByName('ST_TIME').AsSting - TimetoStr(Time)).

 I am getting errors. Please tell me the way to do this.
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Question by:VENKAT
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11 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7176635
try

if time-strtotime(Table.FieldByName('ST_TIME').AsSting) > 2 then ...

but attention
your apptimeformat or systemtimeformat must
be set to this format

11:56:32PM

meikl ;-)
0
 
LVL 27

Accepted Solution

by:
kretzschmar earned 20 total points
ID: 7176642
oops something missed->ST_Date

replace this

if time-strtotime(Table.FieldByName('ST_TIME').AsSting) > 2 then ...

with

if now-(
   Trunc(strtodate(Table.FieldByName('ST_DATE').AsSting))+  
   Frac(strtotime(Table.FieldByName('ST_TIME').AsSting))
   ) > 2 then ...

just from head, not tested

meikl ;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7176645
but attention
your apptimeformat or systemtimeformat and
your appdateformat or systemdateformat
must be set to your format

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LVL 1

Author Comment

by:VENKAT
ID: 7176690
hi kretzschmar
       thank u. But How can I check with my Date and Time both with present Date and Time to get 48 hours difference.
0
 
LVL 1

Author Comment

by:VENKAT
ID: 7176694
hi kretzschmar
       thank u. But How can I check with my Date and Time both with present Date and Time to get 48 hours difference.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7176699
now() gives you the current-datetime,
see above, the if statement does all for you

one day is represented by 1

meikl ;-)
0
 
LVL 1

Author Comment

by:VENKAT
ID: 7176701
hi kretzschmar
       thank u. But How can I check with my Date and Time both with present Date and Time to get 48 hours difference.
0
 
LVL 1

Author Comment

by:VENKAT
ID: 7176705
sorry I think my page was refresh..i will check first.
0
 
LVL 1

Author Comment

by:VENKAT
ID: 7176711
I used like this...my ST_DATE is date field which have date like 25/07/2002.
        if now - (
          Trunc(TimeTable.FieldByName('ST_DATE').AsDateTime)+
          Frac(strtotime(TimeTable.FieldByName('ST_TIME').AsString))
          ) > 2 then
...Now I am getting error like 25/07/2002 is not valid DateTime.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7176718
well,
your system-shortdateformat seems
to be other than dd/mm/yyyy

at appstart (for ex. in the create-event of your mainform)
set the dateformat appwide with

shortdateformat := 'dd/mm/yyyy';
dateseparator := '/';

meikl ;-)
0
 
LVL 1

Author Comment

by:VENKAT
ID: 7176782
thank u..success.
0

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