On 29 August 2012 07:48, keerthi <[email protected]> wrote: > @colin here i found in console > >>> @bio = Biometric.find(36457) > => #<Biometric id: 36457, rfid: 0, userid: 3, date_time: "2012-08-29 > 09:30:00", checkin_checkout: nil, forget: nil, reason: nil, entered_by: nil, > created_at: "2012-08-29 09:30:00", updated_at: "2012-08-29 09:30:00", > RealCheckIn: nil, MACHINENO: nil> >>> @first = @bio.date_time.to_i > => 1346232600 >>> @now = Time.now > => Wed Aug 29 12:13:46 +0530 2012 >>> @time_now = @now.to_i > => 1346222626 >>> @time_now - @first > => -9974 > > @first = @bio.date_time > => Wed, 29 Aug 2012 09:30:00 UTC +00:00 > with out converting to to_i > >>> @now = Time.now > => Wed Aug 29 12:16:48 +0530 2012 > with out converting to_i > > as i found was my date from database is in UTC format and when it comes to > Time.now its not UTC > > > how can i solve it
First a slight correction. The time in the database is not in UTC /format/ it is just in UTC. UTC is not a time format it is a time zone. Assuming that the column type is datetime (look in db/schema.db to check) it should not be a problem. When you subtract the times it should allow for the different time zones and give you the correct difference in seconds, provided that the time in the database is correct for UTC. If that is not working for you please give an example of it not working. If it makes it easier for you to understand what is going on you can convert Time.now to utc by using Time.now.utc. That will not change the result when you subtract the utc time in the database of course, as it is still the same time, just represented in a different time zone. Colin > > Cheers > > > > > > On Tue, Aug 28, 2012 at 9:28 PM, Colin Law <[email protected]> wrote: >> >> On 28 August 2012 16:40, sameena Khan <[email protected]> >> wrote: >> > @colin if i have two timings9:30 PM and 10:52 i got correct output here >> > it >> > is 10 hours : 38mins >> > and if i give Time.now as one input and 10:30 AM as another input i got >> > 2 >> > hours : mins >> >> The best thing is to put in some diagnostic code and work out what is >> happening. Remember Time.now is not a time of day it is a date and >> time. Hopefully your other times are also full date and time objects. >> >> Colin >> >> > >> > >> > i dont think it is timezone issue because if there are two fixed inputs >> > and >> > if i subtract them with my code i get the correct output the only issue >> > is >> > with Time.now as a input i guess. i wanna calculate the working hours >> > with >> > mins of an employee. As i explained before if the employee checkin and >> > checkout time is there i can able to calculate it and if i wanna show >> > right >> > from his checkin until he checkout every min of his working hours and >> > mins i >> > have to go for Time.now as another input. >> > >> > On Tue, Aug 28, 2012 at 8:05 PM, Colin Law <[email protected]> >> > wrote: >> >> >> >> On 28 August 2012 15:18, Khan <[email protected]> wrote: >> >> > Hey everyone >> >> > >> >> > i am trying to subtract two different times.i am getting >> >> > right >> >> > when i have two fixed times. >> >> > here is my code >> >> > >> >> > >> >> > def hour_min(last,first) >> >> > >> >> > difference = last - first >> >> > seconds = difference % 60 >> >> > difference = (difference - seconds) / 60 >> >> > minutes = difference % 60 >> >> > difference = (difference - minutes) / 60 >> >> > hours = difference % 24 >> >> > >> >> > return hours,minutes >> >> > >> >> > end >> >> > if last =9:30 PM and first = 10:52 i get after subtraction 10 hours : >> >> > 38 >> >> > mins but the problem is with Time.now >> >> > if last = Time.now and first = 10:30 am it is give improper output >> >> > >> >> > >> >> > >> >> > this is my view >> >> > <% hour_min = hour_min(Time.now.to_i,cin.first.to_i)%> >> >> >> >> You should not need to call to_i, just pass in the times, the >> >> difference of two times is the difference in seconds. >> > >> > >> > If i don't call with to_i the output will be with decimal(i.e., 3.o >> > hours ) >> > to convert them i went with to_i >> >> >> >> >> >> > <%="#{hour_min[0]}Hour : #{hour_min[1]}Min"%> >> >> > >> >> > My problem is if i have two fixed timings i am getting correct but >> >> > when >> >> > i >> >> > have to calculate with Time.now i am getting wrong answer can any one >> >> > help >> >> > me out >> >> >> >> Have a look at the Rails Guide on debugging which will show you >> >> techniques that can be used to debug the code. I would start just by >> >> running the console (rails c) and try calling your method with various >> >> values and see what happens. You can use puts in the method to print >> >> intermediate results and see what is happening. >> >> >> >> What results are you getting? Is it a number of hours out? If so >> >> then I guess it is a time zone issue. >> >> >> >> Colin >> >> >> >> -- >> >> You received this message because you are subscribed to the Google >> >> Groups >> >> "Ruby on Rails: Talk" group. >> >> To post to this group, send email to [email protected]. >> >> To unsubscribe from this group, send email to >> >> [email protected]. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> >> >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups >> > "Ruby on Rails: Talk" group. >> > To post to this group, send email to [email protected]. >> > To unsubscribe from this group, send email to >> > [email protected]. >> > For more options, visit https://groups.google.com/groups/opt_out. >> > >> > >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Ruby on Rails: Talk" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
