Does someone knows how to calculate the total hours between 2 times?
For example if a worker clocks in at 8:00 and out at 16:00, I would like to know that in decimal it's 8.0 hours and it's 8:00 hours.
I'm using C# framework 2.0.
The variables that hold the in and out time are of type string.
TY
DateTime start = new DateTime(2010, 8, 25, 8, 0, 0);
DateTime end = new DateTime(2010, 8, 25, 16, 0, 0);
Console.WriteLine((end - start).TotalHours);
for strings:
DateTime start = DateTime.Parse("8:00");
DateTime end = DateTime.Parse("16:00");
Console.WriteLine((end - start).TotalHours);
I came up with this daylight saving time safe method. The function is correct for both UTC and local timezones. If the DateTimeKind is Unspecified on either of the inputs then the return value is undefined (which is a fancy way of saying it could be incorrect).
private double TotalHours(DateTime earliest, DateTime latest)
{
earliest = (earliest.Kind == DateTimeKind.Local) ? earliest.ToUniversalTime() : earliest;
latest = (latest.Kind == DateTimeKind.Local) ? latest.ToUniversalTime() : latest;
return (latest - earliest).TotalHours;
}
System.DateTime punchIn = new System.DateTime(2010, 8, 25, 8, 0, 0);
System.DateTime punchOut = new System.DateTime(2010, 8, 25, 16, 0, 0);
System.TimeSpan diffResult = punchOut.Subtract(punchIn);
Check out TimeSpan.TotalHours:
TimeSpan difference = datetime2 - datetime1;
double totalHours = difference.TotalHours;
You can do it by subtracting two datetimes and using the TotalHours property of the resulting Timespan. Heres an example:
DateTime start = new DateTime(2010, 8, 25, 8, 0, 0);
DateTime end = new DateTime(2010, 8, 25, 16, 0, 0);
int hours = end.Subtract(start).TotalHours;
Related
There was a problem converting unixtime to DateTime.
I am passing in parameter 1663869600 this is September 22, 22. But in the code, after instrumentation, I get the date 1/20/1970 6:11:09 AM.
Why is that ?
I will convert the date in the following ways:
DateTime start = DateTimeOffset.FromUnixTimeMilliseconds(request.StartTime).DateTime;
var startUtc = DateTime.SpecifyKind(start, DateTimeKind.Utc);
and
DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var startUtc = dtDateTime.AddMilliseconds(request.StartTime).ToLocalTime();
Unix time is number of seconds (not milliseconds) since the epoch (as #Gus correctly mentioned). So the solution is to use FromUnixTimeSeconds instead of FromUnixTimeMilliseconds and AddSeconds instead of AddMilliseconds.
DateTime start = DateTimeOffset.FromUnixTimeSeconds(1663869600).DateTime;
var startUtc = DateTime.SpecifyKind(start, DateTimeKind.Utc);
DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var startUtc2 = dtDateTime.AddSeconds(1663869600).ToLocalTime();
On my website i want to ensure if the time gap is under 1 minute of DateTime st of the below function, an action can be taken otherwise it would be declined. Here's the code for that
DateTime st = MyDate.Value; // current value from database: 2019-12-05 13:20:15.478
DateTime now = DateTime.Now;
TimeSpan span = now.Subtract(st);
int expMin = 1;
if (span.Minutes < expMin)
{
// Do something
}
else
{
// Ignore
}
So based on the above date value the service cant be accessed after 2019-12-05 13:21:15.478
This works locally and on my server but I've seen some reports where some users are accessing the service from another country. Is there another way i should be ensuring the time, no matter which country the user is from, can't be accessed after the one minute timespan?
You need to use DateTimeOffset to consider the timezone of your users.
I assume that "MyDate" is passed by the client. See the following example.
var myDate = new DateTimeOffset(2019, 12, 05, 13, 20, 15, 478, new TimeSpan(0, 2, 0, 0, 0));
var now = new DateTimeOffset(2019, 12, 05, 14, 20, 45, 478, new TimeSpan(0, 3, 0, 0, 0));
var span = now.Subtract(myDate);
int expMin = 1;
if (span.Minutes < expMin)
{
Console.WriteLine("Do something");
}
else
{
Console.WriteLine("Ignore");
}
In my app I've a ticker which runs every 5 seconds. I've also an internal clock and I want to detect when the day chages.
To test, I have tried the following code without success:
DateTime A = new DateTime(2019, 6, 20, 23, 58, 29);
DateTime B = new DateTime(2019, 6, 21, 00, 01, 12);
Int32 dd = (B-A).Days; // it returns 0
double dd = (B-A).TotalDays; // it return 0.00002136213
If I check if TotalDays > 0 I succesfully detect the day change but in the follwing case (with a difference of a minute)
DateTime C = new DateTime(2019, 6, 20, 12, 58, 29);
DateTime D = new DateTime(2019, 6, 20, 12, 59, 29);
the compare fails. Since I need to call a method when day changes, with the example above its called every time and I do not want this behevior. Any hint?
compare Date part of DateTime directly
bool isSameDay = (A.Date == B.Date);
Look at only the Date parts
DateTime A = new DateTime(2019, 6, 20, 23, 58, 29);
DateTime B = new DateTime(2019, 6, 21, 00, 01, 12);
Int32 dd = (B.Date-A.Date).Days;
For your ticker why not use TimeSpan variables to complete your comparison. You set 1 static timespan variable to 24 hours (1 day) and then create a secondary one to store the values. You then set your second timespan variable equal to the subtraction of your two days and this would let you know if a day had gone by.
`
TimeSpan newDayReference = new TimeSpan(24,0,0);
TimeSpan comparison;
//These two variables set to show difference.
DateTime A= DateTime.Now.AddDays(-1);
DateTime B = DateTime.Now;
comparison = B - A;
if(comparison > newDayReference){ //success }
`
the condition is Time in and Time out (e.g 02/01/2015 02:55 'til 02/02/2015 05:55) that is more than a day. I already computed the total hours of Time in and Time out, and I want to know if the total hours has passed between 23:00(11:00PM ) up to 06:00AM and get the total of it
var hours = (datevalue1 - datevalue2).TotalHours;
or
Timespace ts= (datevalue1 - datevalue2);
var hours = ts.Value.TotalHours;
Try this way.. DateTime.Parse().Subtract()
eg:
string startTime = "11:00 PM";
string endTime = "6:00 AM";
TimeSpan duration = DateTime.Parse(endTime).Subtract(DateTime.Parse(startTime));
Console.WriteLine(duration);
Console.ReadKey();
OR
TimeSpan is the object you need:
TimeSpan span = (DateTime.Now - DateTime.Now);
String.Format("{0} days, {1} hours, {2} minutes, {3} seconds",
span.Days, span.Hours, span.Minutes, span.Seconds);
You can calculate it by passing over time. when its night time add it to TimeSpan.
DateTime timeIn = new DateTime(2015, 09, 29, 10, 11, 3); // 29-09-2015 at 10:11:03
DateTime timeOut = new DateTime(2015, 10, 1, 2, 19, 18); // 01-10-2015 at 02:19:38
TimeSpan nightTime = new TimeSpan(); //total amount of night time
TimeSpan passLength = new TimeSpan(0, 0, 0, 1); // length of time to pass at each iteration (1s)
while (timeIn < timeOut) // do it until timeIn reaches timeOut
{
timeIn = timeIn.Add(passLength); // add 1 second to timeIn
if (timeIn.Hour < 6 || timeIn.Hour == 23) // if we are in range of night time
{
nightTime = nightTime.Add(passLength); // add 1 second to night time
}
}
Console.WriteLine(nightTime);
You can do lot of optimizations. for long times its not good idea to add 1 sec each time. you can add 1 day to TimeIn at each iterate then add only 6 hours to night time. after you get close to Timeout decrease length time
Here is a better way. first get days fast. then get rest of the time.
DateTime timeIn = new DateTime(2015, 09, 29, 10, 11, 3); // 29-09-2015 at 10:11:03
DateTime timeOut = new DateTime(2015, 10, 1, 2, 19, 18); // 01-10-2015 at 02:19:38
// Get days
TimeSpan passLength = new TimeSpan(1, 0, 0, 0); // one day per iterate
while (timeIn + passLength < timeOut)
{
timeIn = timeIn.Add(passLength);
nightTime = nightTime.Add(new TimeSpan(0, 7, 0, 0)); // 7 hours of a day passed is considered night time
}
// Get rest of the time
passLength = new TimeSpan(0, 0, 0, 1); // one second per iterate
while (timeIn < timeOut) // do it until timeIn reaches timeOut
{
timeIn = timeIn.Add(passLength); // add 1 second to timeIn
if (timeIn.Hour < 6 || timeIn.Hour == 23) // if we are in range of night time
{
nightTime = nightTime.Add(passLength); // add 1 second to night time
}
}
Console.WriteLine(nightTime);
You shouldn't be worry about rest of the time calculation performance. since the rest of the time is now less than 1 day which is only 86400 seconds.
Less than 86400 iterates should be fine for today's processors speed. how ever you can still optimize it farther away but you don't get much more performance.
A little bit different and faster approach:
static void Main(string[] args)
{
TimeSpan result = new TimeSpan();
DateTime dt1 = new DateTime(2015, 09, 29, 10, 11, 03);
DateTime dt2 = new DateTime(2015, 10, 01, 02, 19, 38);
DateTime d1 = new DateTime(dt1.Year, dt1.Month, dt1.Day, 0, 0, 0); //Date only
DateTime d2 = new DateTime(dt2.Year, dt2.Month, dt2.Day, 0, 0, 0); //Date only
//Count night time in first day
result += DateTime.Compare(dt1, d1.AddHours(6)) > 0 ? new TimeSpan(6, 0, 0) : new TimeSpan(dt1.Hour, dt1.Minute, dt1.Second);
if (DateTime.Compare(dt1, d1.AddHours(23)) > 0) result += new TimeSpan(dt1.Hour - 23, dt1.Minute, dt1.Second);
//Count night time in last day
result += DateTime.Compare(dt2, d2.AddHours(6)) > 0 ? new TimeSpan(6, 0, 0) : new TimeSpan(dt2.Hour, dt2.Minute, dt2.Second);
if (DateTime.Compare(dt2, d2.AddHours(23)) > 0) result += new TimeSpan(dt1.Hour - 23, dt2.Minute, dt2.Second);
//Count night time in middle days
int daysBetween = (int)(d2 - d1).TotalDays - 1;
result += new TimeSpan(daysBetween * 7, 0, 0);
Console.WriteLine("Night time: " + result);
Console.ReadKey();
}
Compare EndTime with your Range(23:00-06:00)
that is in your Case, check wether EndTime 05:55 < 06:00 and EndTime 05:55 > 23:00
You can subtract the DateTime values to get the TimeSpan in between. Then you can get the TotalHours in that
var hours = timeOut.Subtract(timeIn).TotalHours;
For example
timeIn = 29-09-2015 10:11:03;
timeOut = 01-10-2015 02:19:38;
hours = 52.14303137125;
In C# I have from and to DateTime vales and want to check whether a value DateTime is within the range, how can I do this?
lowerBound = "01-Dec-2011 09:45:58"
upperBound = "01-Dec-2011 09:38:58"
value = "01-Dec-2011 09:49:58"
Just use the comparison operators as you would for numbers:
DateTime lowerBound = new DateTime(2011, 12, 1, 9, 38, 58);
DateTime upperBound = new DateTime(2011, 12, 1, 9, 49, 58);
DateTime value = new DateTime(2011, 12, 1, 9, 45, 58);
// This is an inclusive lower bound and an exclusive upper bound.
// Adjust to taste.
if (lowerBound <= value && value < upperBound)
You'll need to be careful that the values are all the same "kind" (UTC, local, unspecific). If you're trying to compare instants in time, (e.g. "did X happen before Y") it's probably best to use UTC.