My question is How can i calculate time duration between sunrise and sunset?
Then how can i divide this duration(sunrise to sunset) into 8 equal parts(Hr: Min)?
All i need is starting and ending time of every part. And i want to write this code in VB.NET
because in VB.NET i can easily design the GUI.
Thanks
A quick search for "sunrise VB.NET" came up with a few results, such as this one.
You can use TimeSpan. Add the sunrise and sunset to it, and then use timespan.Seconds, timespan.Hours etc
To devide it into 8 equal parts, just use timespan.Seconds / 8 and then calculate that into hours, minutes and seconds
If you don't already have the sunrise and sunset time, you can use this project to calculate it: http://www.codeproject.com/KB/cs/SunTime.aspx
Related
I am applying the VRP example of optaplanner with time windows and I get feasible solutions whenever I define time windows in a range of 24 hours (00:00 to 23:59). But I am needing:
Manage long trips, where I know that the duration between leaving the depot to the first visit, or durations between visits, will be more than 24 hours. So currently it does not give me workable solutions, because the TW format is in 24 hour format. It happens that when applying the scoring rule "arrivalAfterDueTime", always the "arrivalTime" is higher than the "dueTime", because the "dueTime" is in a range of (00:00 to 23:59) and the "arrivalTime" is the next day.
I have thought that I should take each TW of each Customer and add more TW to it, one for each day that is planned.
Example, if I am planning a trip for 3 days, then I would have 3 time windows in each Customer. Something like this: if Customer 1 is available from [08:00-10:00], then say it will also be available from [32:00-34:00] and [56:00-58:00] which are the equivalent of the same TW for the following days.
Likewise I handle the times with long, converted to milliseconds.
I don't know if this is the right way, my consultation would be more about some ideas to approach this constraint, maybe you have a similar problematic and any idea for me would be very appreciated.
Sorry for the wording, I am a Spanish speaker. Thank you.
Without having checked the example, handing multiple days shouldn't be complicated. It all depends on how you model your time variable.
For example, you could:
model the time stamps as a long value denoted as seconds since epoch. This is how most of the examples are model if I remember correctly. Note that this is not very human-readable, but is the fastest to compute with
you could use a time data type, e.g. LocalTime, this is a human-readable time format but will work in the 24-hour range and will be slower than using a primitive data type
you could use a date time data tpe, e.g LocalDateTime, this is also human-readable and will work in any time range and will also be slower than using a primitive data type.
I would strongly encourage to not simply map the current day or current hour to a zero value and start counting from there. So, in your example you denote the times as [32:00-34:00]. This makes it appear as you are using the current day midnight as the 0th hour and start counting from there. While you can do this it will affect debugging and maintainability of your code. That is just my general advice, you don't have to follow it.
What I would advise is to have your own domain models and map them to Optaplanner models where you use a long value for any time stamp that is denoted as seconds since epoch.
I have two times : actual_arr and sched_arr. Both times are in the format char (YYYYMMDDHH24MISS).
Now I've to calculate the punctuality of each movement. The rows are stored as below :
MovtName Actual_Arr Sched_Arr
mvt1 20140206215900 20140206210000
Now my definition of punctuality is (in percentage) : (actual time - sched time)/sched time*100.
I know how to calculate the difference for each movement. The code snippet I used is :
Trunc((To_Date(actual_arr,'YYYYMMDDHH24MISS')-To_Date(sched_arr,'YYYYMMDDHH24MISS'))*24*60,2)
This gives the delay in minutes.
Now what do I divide this value with? This is what I cannot wrap my head around. How do I convert the sched_arr into minutes? Or in other words what is the valid denominator for the equation for punctuality?
If anybody has a more correct definition for punctuality and how to calculate it, I'm all ears.
Thanks in advance.
For a single meeting, just use the lateness in minutes as a measurement of punctuality.
When you have multiple meetings you can start to define punctuality in non-dimensional terms, such as the percentage of meetings which started more then five minutes late.
I have a time stored as a decimal(9,2) column in an sql-server 2005 database.
The time is represented like
Time timeInDecimal
1H 20Min 1.33
1H 30Min 1.50
and so on
I´m looking for an easy way to check whether the number of minutes except whole hours is not evenly divided by 5.
The value I'm hoping to find is where the time is 1H:23Min but not 1H:25MIN.
I just wan´t to compare the minute part of the time.
The way I do now is:
RIGHT(CONVERT(varchar(5),DATEADD(minute,ROUND(timeInDecimal * 60,0),0),108),1) not in ('0','5')
But it does hardly seems to be the ideal way to deal with this.
Feels like I can use the modulo operator for this, but how?
Or is there an even better way?
Hope for a quick answer.
Kind Regards
Andreas
Using the modulus operator, twice:
ROUND((timeInDecimal % 1) * 60, 0) % 5 <> 0
That will:
Get the fractional part and convert it to minutes.
Round it to the nearest minute (.33 hours -> 20 minutes, not 19.80).
Check whether that's divisible by 5.
I would like to be able to (on button click) start a countdown (in minute intervals, that also updates every minute) from the current time to a timespan that already exists. How can I do this?
I read somewhere there are a few different timers, I need a solution that I can use in windows phone 7 as well as in a windows forms application.
I'm aware there are a lot of existing questions, I just can't seem to find one that does this exact thing - if someone could point me in the right direction even?
Thanks
You can calculate the number of minutes and seconds between two timespans, then you can subtract a number of seconds or minutes from this new timespan each second to determine a new timespan, this new timespan will reduce each time the subtraction occurs. Once this new timespan reduces to 0, you know the time is up or the countdown has completed.
how to add hours , minutes amd secs in same function in sybase..
SELECT dateadd(hh,3,getdate()
in this i need to add 3.5 [3hrs,30mins]. How to do that? can any one help me.
Can you add 210 minutes instead?
More specifically, convert to the smallest unit, and add that. You can't add fractions of units.
For some people, a more legible way would be:
SELECT dateadd(mi,30,dateadd(hh,3,getdate()))