I'm writing a service but I want to have config settings to make sure that the service does not run within a certain time window on one day of the week. eg Mondays between 17:00 and 19:00.
Is it possible to create a datetime that represents any monday so I can have one App config key for DontProcessStartTime and one for DontProcessEndTime with a values like "Monday 17:00" and "Monday 19:00"?
Otherwise I assume I'll have to have separate keys for the day and time for start and end of the time window.
Any thoughts?
thanks
You could use a utility that will parse your weekday text into a System.DayOfWeek enumeration, example here. You can then use the Enum in a comparison against the DateTime.Now.DayOfWeek
You can save the day of the week and start hour and endhour in your config file, and then use a function similar to the following:
public bool ShouldRun(DateTime dateToCheck)
{
//These should be read from your config file:
var day = DayOfWeek.Monday;
var start = 17;
var end = 19;
return !dateToCheck.DayOfWeek == day &&
!(dateToCheck.Hour >= start && dateToCheck.Hour < end);
}
You can use DayOfTheWeek property of the DateTime.
And to check proper time you can use DateTime.Today (returns date-time set to today with time set to 00:00:00) and add to it necessary amount of hours and minutes.
The DateTime object cannot handle a value that means all mondays. It would have to be a specific Monday. There is a DayOfWeek enumeration. Another object that may help you is a TimeSpan object. You could use the DayOfWeek combined with TimeSpan to tell you when to start, then use another TimeSpan to tell you how long
This is very rough code, but illustrates that you can check a DateTime object containing the current time as you wish to do:
protected bool IsOkToRunNow()
{
bool result = false;
DateTime currentTime = DateTime.Now;
if (currentTime.DayOfWeek != DayOfWeek.Monday && (currentTime.Hour <= 17 || currentTime.Hour >= 19))
{
result = true;
}
return result;
}
Related
I wanted to find if two DateTime are within a week.
One of them is the current system Datetime, which I got it by using:
DateTime CurrentDateTime = new DateTime();
CurrentDateTime = DateTime.Now;
The other DateTime will just be a selected date. Assuming it is stored in a variable called : ExportDate.
So, I can find the difference between them by doing
ExportDate.Subtract(CurrentDateTime)
But I cannot change this value into a int for comparing...
So how should I compare this to DateTime to see if this two dates are greater then 0Days, and less then 7Days.
Subtracting two datetimes gives you a TimeSpan. This class comes with a property called TotalDays.
Gets the value of the current TimeSpan structure expressed in whole and fractional days.
Src: https://msdn.microsoft.com/en-Us/library/system.timespan(v=vs.110).aspx
You can use to count the number of days I guess.
Regards,
Seb
Try to compare the TotalDays of the resulting TimeSpan. Depending on which is later, the result must be between -7 and 7. Use Math.Abs to avoid comparing the value against both bounds:
bool isWithinWeek = Math.Abs(ExportDate - CurrentDate).TotalDays) < 7
If the time of day is irrelevant, compare only the dates:
bool isWithinWeek = Math.Abs(ExportDate.Date - CurrentDate.Date).TotalDays) < 7
You can use
(ExportDate - CurrentDateTime).TotalDays <= 7
You can simply use the DayOfYear property of DateTime to get the day in the year and then check if the difference is less than 7 or not. You can try:
bool isWithinAWeek = Math.Abs(currentDateTime.DayOfYear-exportDate.DayOfYear)>7?false:true;
What is the best way to compare two DateTime in a specific format and trigger code if DateTime has passed.
My DateTime is formatted as 4/26/2017 10:00:00 AM
DateTime currentDateTime = DateTime.Now;
DateTime eventDateTime = DateTime.Parse("4/26/2017 10:00:00 AM");
int result = DateTime.Compare(currentDateTime, eventDateTime);
if (result < 0)
Response.Write( "is earlier than Do Nothing");
else if (result == 0)
Response.Write("is the same time as: Do Nothing");
else
Response.Write("Time is greater, Trigger Action ");
Is the above code fine for comparison or we can improve it.
For my opinion, the method you suggested is the most efficiant and accepted way to compare 2 DateTime variables in C#, considering you need to take action if the 2 dates are also equal.
Side note:
If you only needed to compare the 2 DateTime without the equal condition, you could just write:
if (currentDateTime < eventDateTime)
Response.Write("is earlier than Do Nothing");
else
Response.Write("Time is greater, Trigger Action");
which is a bit cleaner and more efficiant.
To compare Dates, your method is efficient one because according to MSDN
The CompareTo method compares the Ticks property of the current instance and value but ignores their Kind property. Before comparing DateTime objects, make sure that the objects represent times in the same time zone.
So as it does compare Ticks of two instances of DateTime, so it is the efficient method for comparison.
As a side note, if you want to find interval between DateTime Instances then you can use DateTime.Subtraction it will give TimeSpan of both DateTime instances. So you can find total difference in their minutes, hours, days, seconds, milliseconds by using TimeSpan properties.
DateTime date1 = new DateTime(2010, 1, 1, 8, 0, 15);
DateTime dateNow = DateTime.Now;
TimeSpan interval = dateNow.Subtract(date1);
double totalHours= interval.TotalHours;
double totalMinutes = interval.TotalMinutes;
double totalSeconds= interval.TotalSeconds;
double totalMilliseconds= interval.TotalMilliseconds;
You can use nested if else statement as below:
if (currentDateTime < eventDateTime)
Response.Write("is earlier than Do Nothing");
else if(currentDateTime > eventDateTime)
Response.Write("time is greater, Trigger Action");
else
Response.Write("is the same time as: Do Nothing");
I have application that needs to be run on working days, and within working hours.
In application configuration, I've set start time in format
Monday-Friday
9:00AM-5:30PM
Now, I have a problem how to check if current day is within day boundare is (for the time is easy - parse time with DateTime.ParseExact and simple branch will do), but I don't know how to parse days.
I've tried with:
DayOfWeek day = DateTime.Now.DayOfWeek;
if (day >= (DayOfWeek)Enum.Parse(typeof(DayOfWeek), sr.start_day) &&
day <= (DayOfWeek)Enum.Parse(typeof(DayOfWeek), sr.end_day))
{ /* OK */ }
sr.start_day and sr.end_day are strings
but the problem occurred during weekend testing - apparently, in DayOfWeek enum, Sunday is first day of the week (refering to the comments on MSDN page
I suppose I could do some gymnastics with current code, but I am looking for the most readable code available.
Edit
Sorry for the misunderstanding - working days are not from Monday to Friday - they are defined as strings in config file, and they can be even from Friday to Saturday - which breaks my original code.
if ((day >= DayOfWeek.Monday) && (day <= DayOfWeek.Friday))
{
// action
}
From Hans Passant's comment on my original question:
Just add 7 to the end day if it is less than the start day. Similarly,
add 7 to day if it is less than the start day.
DayOfWeek day = DateTime.Now.DayOfWeek;
DayOfWeek start_day = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), sr.start_day);
DayOfWeek end_day = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), sr.end_day);
if (end_day < start_day)
end_day += 7;
if (day < start_day)
day += 7;
if (day >= start_day && day <= end_day)
{
//Action
}
extention for DateTime
public static bool IsWeekend(this DateTime date)
{
return new[] {DayOfWeek.Sunday, DayOfWeek.Saturday}.Contains(date.DayOfWeek);
}
This is an elegant solution for the problem. It's a class that can easily be imported into other projects. The coding allows the programmer to dynamically assign what days to check for and pass them as a string array to the class. The data can come from a database or be hard coded when you pass it to an instance of this class for processing. It returns the values of True if you're off work and False if you're working that day. Below the class I provided a simple example of implementation. This class features: Dynamic allocation of what days you have off, Simple error handler by setting strings to lowercase before comparing them, Easily integrated with a database that has your work schedule where your days off may not always be the same. Easily integrated as a hard coded number of days off.
// The Class To Check If You're Off Work
class DayOffChecker
{
public bool CheckDays(List<string> DaysOff)
{
string CurrentDay = DateTime.Now.DayOfWeek.ToString();
CurrentDay.ToLower();
foreach (string DayCheck in DaysOff)
{
DayCheck.ToLower();
if (CurrentDay == DayCheck)
{
return (true);
}
}
return (false);
}
}
// Example usage code:
class Program
{
List<string> DaysOff = List<string>();
DaysOff.Add("Saturday"); // Add some values to our list.
DaysOff.Add("Sunday");
DayOffChecker CheckToday = new DayOffChecker();
if(CheckToday.CheckDays(DaysOff))
{
Console.WriteLine("You're Off Today!!!");
}
}
We can also follow similar approach of checking if a given hour is between two hours. Following is the algorithm
checkIfFallsInRange(index,start,end)
bool normalPattern = start <= end ;
if ( normalPattern)
return index>=start && index<=end;
else
return index>=start || index <=end;
My simple solution to determining if the current day is a workday or not is:
public static bool IsWorkDay(this DateTime dt)
{
return IsWorkDay(dt, DayOfWeek.Sunday, DayOfWeek.Saturday);
}
public static bool IsWorkDay(this DateTime dt, params DayOfWeek[] noneWorkDays)
{
return !noneWorkDays.Contains(dt.DayOfWeek);
}
It assumes Sunday / Saturday are non-work days. Otherwise the user can specify the non-work days. And is an extension for easy of use.
Note: To avoid a loop could created a bit flag.
DayOfWeek Day = DateTime.Today.DayOfWeek;
int Time = DateTime.Now.Hour;
if (Day != DayOfWeek.Saturday && Day != DayOfWeek.Sunday)
{
if (Time >= 8 && Time <= 16)
{
//It is Weekdays work hours from 8 AM to 4 PM
{
}
else
{
// It is Weekend
}
You can use the DayOfWeek enumeration in order to see if a date is Sunday or Saturday. http://msdn.microsoft.com/en-us/library/system.dayofweek.aspx I hope this can help.
The line below will return "Sunday"
string nameOfTheDay = DateTime.Now.ToString("dddd", new System.Globalization.CultureInfo("en-GB")).ToLower();
if(nameOfTheDay != "sunday" && nameOfTheDay != "saturday")
{
//Do Stuff
}
public bool IsWeekend(DateTime dateToCheck)
{
DayOfWeek day = (DayOfWeek) dateToCheck.Day;
return ((day == DayOfWeek.Saturday) || (day == DayOfWeek.Sunday));
}
So I'm trying to figure out what I'm doing wrong with this logic. It seems straightforward and my breakpoints indicate that the evaulation in the 'if' statement is resolving as True, but sum.ppStart et al aren't getting 14 days added to them.
It's probably something simple, but any help would be appreciated.
//Determine the start/end days of each week of the pay period and retrieve a list of those entries
DateTime[] weeks = timeTools.calcPP(0);
DateTime today = DateTime.Now.Date;
if (today > weeks[3])
{
weeks[0].AddDays(14);
weeks[3].AddDays(14);
weeks[4].AddDays(14);
}
sum.ppStart = weeks[0];
sum.ppEnd = weeks[3];
sum.payDate = weeks[4];
AddDays returns a new instance of DateTime, the existing value is not changed, it is an immutable structure. When using the function, capture the result
DateTime myDate = ...
myDate = myDate.AddDays(14);
That is because you're not using the result of the AddDays method. The signature is
public DateTime AddDays(double days)
or so (see link). You need to do this:
weeks[0] = weeks[0].AddDays(14);
You need to assign the values:
if (today > weeks[3])
{
weeks[0] = weeks[0].AddDays(14);
weeks[3] = weeks[3].AddDays(14);
weeks[4] = weeks[4].AddDays(14);
}
Is there any easy way to get a DateTime's "TimeMin" and "TimeMax"?
TimeMin: The very first moment of the day. There is no DateTime that occurs before this one and still occurs on the same day.
TimeMax: The very last moment of the day. There is no DateTime that occurs after this one and still occurs on the same day.
These values would be helpful for filtering and doing date-related queries.
Here are two extensions I use to do exactly that.
/// <summary>
/// Gets the 12:00:00 instance of a DateTime
/// </summary>
public static DateTime AbsoluteStart(this DateTime dateTime)
{
return dateTime.Date;
}
/// <summary>
/// Gets the 11:59:59 instance of a DateTime
/// </summary>
public static DateTime AbsoluteEnd(this DateTime dateTime)
{
return AbsoluteStart(dateTime).AddDays(1).AddTicks(-1);
}
This allows you to write:
DateTime.Now.AbsoluteEnd() || DateTime.Now.AbsoluteStart()
or
DateTime partyTime = new DateTime(1999, 12, 31);
Console.WriteLine("Start := " + partyTime.AbsoluteStart().ToString());
Console.WriteLine("End := " + partyTime.AbsoluteEnd().ToString());
I'd use the following:
DateTime now = DateTime.Now;
DateTime startOfDay = now.Date;
DateTime endOfDay = startOfDay.AddDays(1);
and use < endOfDay instead of <= endOfDay. This will mean that it will work regardless of whether the precision is minutes, seconds, milliseconds, ticks, or something else. This will prevent bugs like the one we had on StackOverflow (though the advice was ignored).
Note that it is important to only call DateTime.Now once if you want the start and end of the same day.
try
//midnight this morning
DateTime timeMin = DateTime.Now.Date;
//one tick before midnight tonight
DateTime timeMax = DateTime.Now.Date.AddDays(1).AddTicks(-1)
If you are using this for filtering, as your comments suggest, it is probably a good idea to save DateTime.Now into a variable, just in case the date ticks over between the two calls. Very unlikely but call it enough times and it will inevitably happen one day (night rather).
DateTime currentDateTime = DateTime.Now;
DateTime timeMin = currentDateTime.Date;
DateTime timeMax = currentDateTime.Date.AddDays(1).AddTicks(-1)
One small tweak to hunter's solution above...
I use the following extension method to get the end of the day:
public static DateTime EndOfDay(this DateTime input) {
return input.Date == DateTime.MinValue.Date ? input.Date.AddDays(1).AddTicks(-1) : input.Date.AddTicks(-1).AddDays(1);
}
This should handle cases where the DateTime is either DateTime.MinValue or DateTime.MaxValue. If you call AddDays(1) on DateTime.MaxValue, you will get an exception. Similarly, calling AddTicks(-1) on DateTime.MinValue will also throw an exception.
You must be careful to use
(new DateTime()).AddDays(1).AddTicks(-1);
when it is passed to stored procedure.
It could happen that the value will be approximated to next day.
Like other answerers, I'm not quite sure what you're asking for, but incase you want the smallest possible time and the largest possible time, (not just in a day), then there's DateTime.MinValue and DateTime.MaxValue which return 1/1/0001 12:00:00 AM
and 12/31/9999 11:59:59 PM respectively.
I would advise that you look at this answer:
How can I specify the latest time of day with DateTime
If your original DateTimes also potentially include times, using the AddDays() method will add a full 24 hours, which may not be precisely what you want.
public static DateTime ToEndOfDay(this DateTime time)
{
var endOfDaySpan = TimeSpan.FromDays(1).Subtract(TimeSpan.FromMilliseconds(1));
return time.Date.Add(endOfDaySpan);
}
Please note that if you're passing this time to sql server you should use
dateTime.Date.AddDays(1).AddMilliseconds(-3);
See:
How do I get the last possible time of a particular day
DateTime.Today.AddDays(1).AddSeconds(-1);
Not very exact, but fixed my problems. Now we can use AddMilliseconds, AddTicks and etc. I think it will just vary on what would satisfy your need.