I am at a bit of a loss as to the best approach. Let's say I have the following:
//Get the first and last day of the month -- ex February
int month = DateTime.ParseExact("February", "MMMM", new CultureInfo("en-US")).Month;
var now = DateTime.Now;
var firstOfMonth = new DateTime(now.Year, month, 1);
var lastOfMonth = new DateTime(now.Year, month, DateTime.DaysInMonth(now.Year, month));
var coverageStartDate = new DateTime(now.Year, 1, 1);
var coverageEndDate = new DateTime(now.Year, 2, 15);
I am trying to create a check to see if the date range of coverageStartDate and coverageEndDate falls in the month of February. Keep in mind that the values could also look like:
var coverageStartDate = new DateTime(now.Year, 2, 3);
var coverageEndDate = new DateTime(now.Year, 2, 10);
As long as there is a single date in the coverage start / end date range falls in the month of February, I would want to return true.
With DateTime you can use >=, <=, etc.
Adopting your code, I would do something like this:
var firstOfMonth = new DateTime(now.Year, month, 1, 0, 0, 0);
var lastOfMonth = new DateTime(now.Year, month, DateTime.DaysInMonth(now.Year, month), 23, 59, 59);
var coverageStartDate = new DateTime(now.Year, 1, 1);
var coverageEndDate = new DateTime(now.Year, 2, 15);
if(coverageStartDate <= lastOfMonth && coverageEndDate >= firstOfMonth)
{
// Do something
}
This code does not requires that years have to be the same, so the coverage time can span multiple years.
Related
Here the DateTimeOffset instances represent the same time, but one instance has DST and other doesn't.
I would like to compare instances without DST, so the result would be True.
using System;
var today = DateTime.Today;
// Today YYYY-MM-01
var firstDayMonth = new DateTimeOffset(
new DateTime(today.Year, today.Month, 1, 0, 0, 0, today.Kind).AddHours(12));
// Add year offset from 2000
DateTimeOffset withYearOffset = firstDayMonth.AddYears(2000 - firstDayMonth.Year);
// Add month offset from 1
var withMonthOffset = withYearOffset.AddMonths(1 - withYearOffset.Month);
// Add day offset from 1
var calculated_dt_2000_1_1_12_0_0 = withMonthOffset.AddDays(1 - withMonthOffset.Day);
// 01.01.2000 12:00:00 +03:00
Console.WriteLine(calculated_dt_2000_1_1_12_0_0);
var dt_2000_1_1_12_0_0 = new DateTimeOffset(new DateTime(2000, 1, 1).AddHours(12));
// 01.01.2000 12:00:00 + 02:00
Console.WriteLine(dt_2000_1_1_12_0_0);
// False
Console.WriteLine(calculated_dt_2000_1_1_12_0_0.Equals(dt_2000_1_1_12_0_0));
Converting to UTC solves the problem.
var calculated_dt_2000_1_1_12_0_0 = withMonthOffset.ToUniversalTime().AddHours(firstDayMonth.Offset.Hours);
var dt_2000_1_1_12_0_0_withOffset = new DateTimeOffset(new DateTime(2000, 1, 1).AddHours(12));
var dt_2000_1_1_12_0_0 = dt_2000_1_1_12_0_0_withOffset.ToUniversalTime().AddHours(dt_2000_1_1_12_0_0_withOffset.Offset.Hours);
For example, I will be given a time on hours with type DateTime hours like this
for the starter
my starttime is 00:00
endtime is 02:00
and every time 30 minutes I like to input the value into a List<DateTime>
so, how can I get the value to put into a list that is look like this?
00:00
00:30
01:00
01:30
02:00
My Code
DateTime starTime = new DateTime();
DateTime endTimes = new DateTime();
DateTime interval = new DateTime();
List<DateTime> intervals = new List<DateTime>();
starTime = DateTime.ParseExact(fulldate + "00:00",
"yyyy/MM/dd HH:mm",
CultureInfo.InvariantCulture);
endTimes = DateTime.ParseExact(fulldate + "02:00",
"yyyy/MM/dd HH:mm",
CultureInfo.InvariantCulture); ;
interval = starTime;
for (int i = 0; i < 24; i++)
{
interval.AddHours(0.5);
intervals.Add(interval);
if (interval.ToString("HH:mm") == endTimes.ToString("HH:mm"))
{
break;
}
}
Can anyone help me to solve this?
With some assumption (that end time is on the same day, that your end time is always something that can be devided by 30 mins, ...) this would work.
var start = new TimeSpan(0, 0, 0);
var end = new TimeSpan(2, 0, 0);
var current = start;
List<DateTime> values = new List<DateTime>();
var startDate = DateTime.Now.Date; // editited after #pinkflowydx33's comment
values.Add(startDate + start);
while (current < end)
{
current = current.Add(new TimeSpan(0, 30, 0));
values.Add(startDate + current);
}
foreach (var v in values)
{
Console.WriteLine(v);
}
i prepared that type of solution. - It's loop over number, which represent - times of valueToChange - in this specific case between 30 minutes - and add to the startDate - 30 minutes and also saving to list.
using System;
public class Program
{
public static void Main()
{
List<DateTime> intervals = new List<DateTime>();
var changeValue = 30;
var startDate = new DateTime(2010, 05, 12, 13, 00, 00);
var endDate = new DateTime(2010, 05, 12, 14, 00, 00);
var timeIntervals = System.Math.Abs(startDate.Subtract(endDate).TotalMinutes / changeValue);
for (int i = 0; i < timeIntervals; i++)
{
startDate.AddMinutes(30);
intervals.Add(startDate)
}
}
}
In this case the start and end date are divided by 30 minutes without rest - so if there will be 13:00 and 13:12 - it's doesn't add the value to List - cause the value doesn't > 30.
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;
I have here 2 datepicker for start date and end date.
how can I get the first day and last day of the current month
rdpStartDate.SelectedDate = DateTime.Now;
rdpEndDate.SelectedDate = DateTime.Now;
DateTime now = DateTime.Now;
var startDate = new DateTime(now.Year, now.Month, 1);
var endDate = startDate.AddMonths(1).AddDays(-1);
var now = DateTime.Now;
var first = new DateTime(now.Year, now.Month, 1);
var last = first.AddMonths(1).AddDays(-1);
You could also use DateTime.DaysInMonth method:
var last = new DateTime(now.Year, now.Month, DateTime.DaysInMonth(now.Year, now.Month));
var myDate = DateTime.Now;
var startOfMonth = new DateTime(myDate.Year, myDate.Month, 1);
var endOfMonth = startOfMonth.AddMonths(1).AddDays(-1);
That should give you what you need.
Try this code it is already built in c#
int lastDay = DateTime.DaysInMonth (2014, 2);
and the first day is always 1.
Good Luck!
An alternative way is to use DateTime.DaysInMonth to get the number of days in the current month as suggested by #Jade
Since we know the first day of the month will always 1 we can use it as default for the first day with the current Month & year as current.year,current.Month,1.
var now = DateTime.Now; // get the current DateTime
//Get the number of days in the current month
int daysInMonth = DateTime.DaysInMonth (now.Year, now.Month);
//First day of the month is always 1
var firstDay = new DateTime(now.Year,now.Month,1);
//Last day will be similar to the number of days calculated above
var lastDay = new DateTime(now.Year,now.Month,daysInMonth);
//So
rdpStartDate.SelectedDate = firstDay;
rdpEndDate.SelectedDate = lastDay;
string firstdayofyear = new DateTime(DateTime.Now.Year, 1, 1).ToString("MM-dd-yyyy");
string lastdayofyear = new DateTime(DateTime.Now.Year, 12, 31).ToString("MM-dd-yyyy");
string firstdayofmonth = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).ToString("MM-dd-yyyy");
string lastdayofmonth = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).AddMonths(1).AddDays(-1).ToString("MM-dd-yyyy");
I have following line to group my collection:
group c by new { date = GetGroupingDateKey(DateRangeType, c.ReadDate), name = c.Name } into g
and I use following function to get grouping date key:
private static DateTime GetGroupingDateKey(MeterReadingsTimeIntervals DateRangeType, DateTime Date)
{
DateTime date = new DateTime();
switch (DateRangeType)
{
case MeterReadingsTimeIntervals.Hourly:
date = new DateTime(Date.Year, Date.Month, Date.Day, Date.Hour, 0, 0);
break;
case MeterReadingsTimeIntervals.Daily:
date = new DateTime(Date.Year, Date.Month, Date.Day, 0, 0, 0);
break;
case MeterReadingsTimeIntervals.Weekly:
// ???
break;
case MeterReadingsTimeIntervals.Monthly:
date = new DateTime(Date.Year, Date.Month, 1, 0, 0, 0);
break;
case MeterReadingsTimeIntervals.Yearly:
date = new DateTime(Date.Year, 1, 1, 0, 0, 0);
break;
}
return date;
}
But I dont know about weekly grouping(it may be specific day intervals, 10 days,15 days, etc.). How can I group weekly? Should I use another way to group data?
Thanks in advice.
Maybe like this:
date = Date.AddDays(-((Date.DayOfWeek - DayOfWeek.Monday +7)%7));
date = new DateTime(date.Year, date.Month, date.Day, 0, 0, 0);
If you consider Monday start of the week.
You can try it using this code:
EDIT Code edited after #Rawling suggestion, check the comments
DateTime dt = DateTime.Now;
dt = dt.AddDays(-((dt.DayOfWeek - DayOfWeek.Monday + 7)%7));
dt = new DateTime(dt.Year, dt.Month, dt.Day, 0, 0, 0);//today is Friday and it will show Monday at the end.
With the helper function
int DaysFromLast(DateTime date, DayOfWeek dow)
{
return (7 + date.DayOfWeek - dow) % 7;
}
you can use
var date = Date.Date;
date = date.AddDays(-DaysFromLast(date, DayOfWeek.Monday));
for a week starting on a Monday, and so on.
For arbitrary intervals, you'll need a constant start date (preferably back in the past); then
var date = Date.Date;
date = date.AddDays(-((date - startDate).Days % numberOfDaysInInterval));
The week is dependent on the kind of calendar that you're using and its rules. Some have the first week of the year start on the first Monday of the year, some on Sunday, etc, there are differences.
You can use GregorianCalendar for instance and its method GetWeekOfYear(DateTime).
case MeterReadingsTimeIntervals.Weekly:
var gc = new GregorianCalendar();
return gc.GetWeekOfYear(Date);
Now for this to work you have to make the return type of your method object or force the weekinfo into the same DateTime (set it to Monday of the found week),