Given this datetime of January 1 2015 at 23:00 hours:
var someDate = new DateTime(2015, 1, 1, 23, 0, 0);
And given the int 6, which is the desired hour, how do I return the first following datetime where the hour is 6? In this case, someDate and 6 would return a new DateTime of January 2 2015 at 06:00 hours.
I would simply add the hours to the original date and add another day if the result is before the original time:
var someDate = new DateTime(2015, 1, 1, 23, 0, 0);
var result = someDate.Date.AddHours(6); // note the "Date" part
if (result < someDate) result = result.AddDays(1);
You just have to add one day to the date and six hours to the result:
var someDate = new DateTime(2015, 1, 1, 23, 0, 0);
var result = someDate.Date.AddDays(1).AddHours(6);
Note the use of Date property - it will give you the start od the day and from there it's easy to navigate forward.
Try this:
while(someDate.Hour != 6){
someDate = someDate.AddHours(1);
}
Assuming you meant 24h clock, you can try this:
public DateTime GetDate(DateTime someDate,int hour)
{
return someDate.Hour>=hour? someDate.Date.AddDays(1).AddHours(6):someDate.Date.AddHours(6);
}
Something like this should do it:
public DateTime FollowingHour(DateTime start, int hour)
{
DateTime atHour = start.Date.AddHours(6);
if(atHour < start)
{
atHour += TimeSpan.FromDays(1);
}
return atHour;
}
Related
Format is DD/MM/YYYY. And for example I will have an int number like 240. This number is total hours actually. Lets accept "01/01/2023 01:00" as a first hour(total hour 1) and "02/01/2023 01:00" as a 25. hour(total hour 24+1=25) from the year beginning. So what would be the date for 240.hours totally? In that case it should be formatted like 11/01/2023 01:00 but I couldn't figure out how to format that.
Your question is a little confusing; I wasn't sure about what you were after, although I think I got it after reading the comments.
Try running this code; I think it will be a help to you.
using System;
DateTime d = DateTime.Now;
var lastMonth = d.AddMonths(-1);
var nextMonth = d.AddMonths(1);
var yesterday = d.AddDays(-1);
var tomorrow = d.AddDays(1);
// lod = length of day
TimeSpan lod1 = new TimeSpan(days: 1, hours: 0, minutes: 0, seconds: 0);
TimeSpan lod2 = new TimeSpan(days: 0, hours: 23, minutes: 59, seconds: 59, milliseconds: 1_000);
if (lod1 != lod2)
{
Console.WriteLine($"This lne should not be seen; {nameof(lod1)}");
}
var tomorrow2 = d.AddDays(lod1.Days);
if (tomorrow != tomorrow2)
{
Console.WriteLine($"This lne should not be seen; {nameof(tomorrow)}");
}
Console.WriteLine($"Tomorrow lives in the month of {tomorrow.Month} and will be day {tomorrow.Day} of that month.\n");
var periodOfTime = new TimeSpan(tomorrow.EndOfDay().Ticks - yesterday.StartOfDay().Ticks);
Console.WriteLine($"{periodOfTime.Days} days between yesterday and tomorrow.");
Console.WriteLine($"{periodOfTime.TotalDays} total days between yesterday and tomorrow.");
var someFutureDate = yesterday.AddDays(periodOfTime.Days);
var someFutureDate2 = yesterday.AddDays(periodOfTime.TotalDays);
Console.WriteLine();
Console.WriteLine($"1) Two {nameof(periodOfTime.Days)} after yesterday is:");
Console.WriteLine(someFutureDate.ToString("yyyy-MM-dd HH:mm:ss.fffff"));
Console.WriteLine(someFutureDate.DayOfWeek);
Console.WriteLine();
Console.WriteLine($"2) Two {nameof(periodOfTime.TotalDays)} after yesterday is:");
Console.WriteLine(someFutureDate2.ToString("yyyy-MM-dd HH:mm:ss.fffff"));
Console.WriteLine(someFutureDate2.DayOfWeek);
internal static class Extensions
{
public static DateTime StartOfDay(this DateTime date) =>
new(date.Year, date.Month, date.Day, 0, 0, 0, 0, date.Kind);
public static DateTime EndOfDay(this DateTime date) =>
new(date.Year, date.Month, date.Day, 23, 59, 59, 999, date.Kind);
}
Running this now, I get:
Tomorrow lives in the month of 12 and will be day 6 of that month.
2 days between yesterday and tomorrow.
2.999999988425926 total days between yesterday and tomorrow.
1) Two Days after yesterday is:
2022-12-06 17:05:52.55833
Tuesday
2) Two TotalDays after yesterday is:
2022-12-07 17:05:52.55733
Wednesday
I am working on some custom rules in a time managment system and need to know how many hours in a shift have been before a certain time (19:00pm) and how many hours after. Shifts can start in the evening and finish in the morning so need to take that into account.
So far I have the below (this is just a snippet for one day) however it seems very clumsy and eloborate what I have written, can't help but feel I am missing a simpler solution, anyone have any ideas?
DateTime cutOffTime = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 19, 00, 00);
string cutOffTimeOfDay = GetTimeOfDayFromDateTime(cutOffTime);
double baseMondayHours = 10.00;
baseMondayHours = (baseMondayHours - 0.5);
if (GetTimeOfDayOnlyFromDateTime(monday.ShiftStart.Value) == "AM" && GetTimeOfDayOnlyFromDateTime(monday.ShiftEnd.Value) == "PM"
&& monday.ShiftEnd.Value.TimeOfDay < cutOffTime.TimeOfDay)
{
postCutOffMondayHours = 0;
baseMondayHours = monday.HoursWorked.Value;
}
else
{
string endTimeOfDay = GetTimeOfDayFromDateTime(monday.ShiftEnd.Value);
double hoursAfterCutOff = GetDuration(cutOffTimeOfDay, endTimeOfDay);
postCutOffMondayHours = hoursAfterCutOff;
baseMondayHours = (baseMondayHours - hoursAfterCutOff);
}
public static string GetTimeOfDayFromDateTime(DateTime d)
{
return d.ToString("HH:mm") + " " + d.ToString("tt", CultureInfo.InvariantCulture);
}
public static string GetTimeOfDayOnlyFromDateTime(DateTime d)
{
return d.ToString("tt", CultureInfo.InvariantCulture).ToUpper();
}
public static double GetDuration(string startTime, string endTime)
{
DateTime start = DateTime.Parse(startTime);
DateTime end = DateTime.Parse(endTime);
if (start > end)
end = end.AddDays(1);
TimeSpan duration = end.Subtract(start);
return duration.TotalHours;
}
I'm not sure if I'm missing something here, but isn't the built-in operator- of DateTime exactly what you're looking for? It returns the TimeSpan between the 2 DateTime, and if you can guarantee shiftStart < cutoffDateTime < shiftEnd, then you can get the hours worked by just using the TotalHours of TimeSpan (but adding that check is just an additional small if)
var shiftStart = new DateTime(2020, 6, 2, 17, 0, 0);
var shiftEnd = new DateTime(2020, 6, 3, 6, 30, 0);
var cutoffDateTime = new DateTime(2020, 6, 2, 19, 0, 0);
var hoursWorkedBefore = (cutoffDateTime - shiftStart).TotalHours;
var hoursWorkedAfter = (shiftEnd - cutoffDateTime).TotalHours;
How to subtract "year=117 month=1 day=28 hour=7 min=43 sec=10" from a DateTime in c#?
I have already tried like below
split the string using regex.
add each item with -ve sign to a current DateTime value.
But I think it's not an efficient way.
Can anyone help me?
You can use below Code as per you requirement to get desired Result. Replace your Date, Time, year values in "new System.DateTime(1996, 6, 3, 22, 15, 0);"
System.DateTime date1 = new System.DateTime(1996, 6, 3, 22, 15, 0);
System.DateTime date2 = new System.DateTime(1996, 12, 6, 13, 2, 0);
System.DateTime date3 = new System.DateTime(1996, 10, 12, 8, 42, 0);
// diff1 gets 185 days, 14 hours, and 47 minutes.
System.TimeSpan diff1 = date2.Subtract(date1);
// date4 gets 4/9/1996 5:55:00 PM.
System.DateTime date4 = date3.Subtract(diff1);
// diff2 gets 55 days 4 hours and 20 minutes.
System.TimeSpan diff2 = date2 - date3;
// date5 gets 4/9/1996 5:55:00 PM.
System.DateTime date5 = date1 - diff2;
you can try DateTime's subtraction.
for that first you have to make valid DateTime object from your information and then subtract that date from current date.
see below code,
int year = 117, month = 01, day = 28;
int hour = 07, minute = 43, second = 10;
DateTime timeToSubtract =
new DateTime(year > 0? year : 1, month > 0 ? month : 1, day > 0 ? day : 1, hour, minute, second);
DateTime subtractedDate =
new DateTime((DateTime.Now - timeToSubtract).Ticks);
as you can see, we are creating a date time object with information we have (date and time which should be subtracted form current date time) by, new DateTime(year, month, day, hour, minute, second) and then subtracting this from DateTime.Now, and then creating final date out of result of this subtraction.
here in last line we are creating a date (of past). this date is of specified time ago.
I'm trying to make a function in C# that returns the week difference between two dates. Its goal is to provide the same result of:
select datediff(ww,'2018-04-13','2018-04-16') as diff
In the example above there is only 3 days between these dates, but they are in different weeks, so the result should be 1.
I've tried to use .TotalDays but it's not working properly. I also tried .GetWeekOfYear but it won't return correctly when the year of the dates are different. I've seem many questions here on StackOverflow and on other forums and so far none of them match my case. This is the function I'm trying to far:
public static int GetWeekDiff(DateTime dtStart, DateTime dtEnd) {
// Doesn't work
var val = ((dtEnd - dtStart).TotalDays / 7);
val = Math.Ceiling(val);
return Convert.ToInt32(val);
// Doesn't work well between years
DateTimeFormatInfo dinfo = DateTimeFormatInfo.CurrentInfo;
var x = dinfo.Calendar.GetWeekOfYear(dtStart, CalendarWeekRule.FirstFullWeek, DayOfWeek.Monday);
var y = dinfo.Calendar.GetWeekOfYear(dtEnd, CalendarWeekRule.FirstFullWeek, DayOfWeek.Monday);
return y - x;
}
In the first part of my function, I tried what is described in this post. It didn't work
Can you help me?
Thanks in advance.
First figure how many days there are between the two dates. Divide the number of days by 7 to get full weeks.
Now figure out if there's an extra week to be counted by finding taking the number of days modulus 7 to get any remaining days. If the first date plus remaining days falls in a different week, add an extra week on to the count.
void Main()
{
var first = new DateTime(2018, 04, 13);
var second = new DateTime(2018, 04, 16);
Console.WriteLine(weekDiff(first, second));
}
public int weekDiff(DateTime d1, DateTime d2, DayOfWeek startOfWeek = DayOfWeek.Monday)
{
var diff = d2.Subtract(d1);
var weeks = (int)diff.Days / 7;
// need to check if there's an extra week to count
var remainingDays = diff.Days % 7;
var cal = CultureInfo.InvariantCulture.Calendar;
var d1WeekNo = cal.GetWeekOfYear(d1, CalendarWeekRule.FirstFullWeek, startOfWeek);
var d1PlusRemainingWeekNo = cal.GetWeekOfYear(d1.AddDays(remainingDays), CalendarWeekRule.FirstFullWeek, startOfWeek);
if (d1WeekNo != d1PlusRemainingWeekNo)
weeks++;
return weeks;
}
static void Main(string[] args)
{
DateTime date1 = new DateTime(2018, 04, 18);
DateTime date2 = new DateTime(2018, 04, 19);
System.Console.WriteLine((GetDiff(new DateTime(2018, 04, 18), new DateTime(2018, 04, 18)))); // 0
System.Console.WriteLine((GetDiff(new DateTime(2018, 04, 22), new DateTime(2018, 04, 23)))); // 1
System.Console.WriteLine((GetDiff(new DateTime(2018, 04, 16), new DateTime(2018, 04, 22)))); // 0
System.Console.WriteLine((GetDiff(new DateTime(2018, 04, 18), new DateTime(2018, 05, 03)))); // 2
}
private static int GetDiff(DateTime date1, DateTime date2)
{
date1 = SetDayToMonday(date1);
date2 = SetDayToMonday(date2);
return (int)((date2 - date1).TotalDays / 7);
}
private static DateTime SetDayToMonday(DateTime date)
{
var weekDay = date.DayOfWeek;
if (weekDay == DayOfWeek.Sunday)
return date.AddDays(-6);
else
return date.AddDays(-((int)weekDay-1));
}
First, set the day to the monday of the current week. Then count all full weeks(= /7 days as int). Easy as it is, it works probably across weeks and years.
See if this works. There could be more use cases that this doesn't cover, and the solution depends on how you define a week boundary (this assumes Sunday-Monday based on a comment above).
// Output:
// Weeks between 12/28/2017 and 1/10/2018: 2
// Weeks between 4/13/2018 and 4/16/2018: 1
// Weeks between 4/21/2018 and 4/22/2018: 0
// Weeks between 4/22/2018 and 4/23/2018: 1
void Main()
{
var datePairs = new List<KeyValuePair<DateTime, DateTime>>();
datePairs.Add(new KeyValuePair<DateTime, DateTime>(new DateTime(2017, 12, 28), new DateTime(2018, 1, 10)));
datePairs.Add(new KeyValuePair<DateTime, DateTime>(new DateTime(2018, 4, 13), new DateTime(2018, 4, 16)));
datePairs.Add(new KeyValuePair<DateTime, DateTime>(new DateTime(2018, 4, 21), new DateTime(2018, 4, 22)));
datePairs.Add(new KeyValuePair<DateTime, DateTime>(new DateTime(2018, 4, 22), new DateTime(2018, 4, 23)));
foreach (var datePair in datePairs)
{
var string1 = datePair.Key.ToShortDateString();
var string2 = datePair.Value.ToShortDateString();
Console.WriteLine($"Weeks between {string1} and {string2}: {GetWeekDiff(datePair.Key, datePair.Value)}");
}
}
public static int GetWeekDiff(DateTime dtStart, DateTime dtEnd)
{
var totalDays = (dtEnd - dtStart).TotalDays;
var weeks = (int)totalDays / 7;
var hasRemainder = totalDays % 7 > 0;
if (hasRemainder)
{
if (!(dtStart.DayOfWeek.Equals(DayOfWeek.Saturday) && dtEnd.DayOfWeek.Equals(DayOfWeek.Sunday)))
{
weeks++;
}
}
return weeks;
}
Maybe it can help
public static int GetIso8601WeekOfYear(DateTime time)
{
// Seriously cheat. If its Monday, Tuesday or Wednesday, then it'll
// be the same week# as whatever Thursday, Friday or Saturday are,
// and we always get those right
DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(time);
if (day >= DayOfWeek.Monday && day <= DayOfWeek.Wednesday)
{
time = time.AddDays(3);
}
// Return the week of our adjusted day
return CultureInfo.InvariantCulture.Calendar.GetWeekOfYear(time, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
}
Get the correct week number of a given date
Can't comment yet and already used a flag on this post on something I believed to be similar. Here is another post I found that appears to align with the solution you are trying to create:
Get the number of calendar weeks between 2 dates in C#
This is my implementation to solve a similar problem, I haven't tested in thoroughly but it seems to work.
var dt1 = DateTime.Today.AddDays(-30);
var dt2 = DateTime.Today;
var noOfDays =(int) (dt2 - dt1).TotalDays;
int reminder;
var weeks = Math.DivRem(noOfDays, 7, out reminder);
weeks = reminder > 0 ? weeks + 1 : weeks;
It returns 1 week for 6 days or less gap, which is exactly what I needed.
I am trying to get the affected hours between 2 datetime and all i found was a python solution.
For example 'start' is 09:30 and 'end' is 14:00 (same day). The values I'd like returned are
[9:00, 10:00, 11:00, 12:00, 13:00, 14:00]
Python get whole hour values between 2 datetime objects
I can't seem to find any equivalent to C#.
So you want a list of all hours between both dates? You can use this query:
TimeSpan ts = dt2 - dt1;
IEnumerable<int> hoursBetween = Enumerable.Range(0, (int)ts.TotalHours)
.Select(i => dt1.AddHours(i).Hour);
Sample dates:
DateTime dt1 = new DateTime(2013, 07, 08, 15, 50, 00);
DateTime dt2 = new DateTime(2013, 07, 10, 19, 30, 00);
TimeSpan ts = dt2 - dt1;
IEnumerable<int> hoursBetween = Enumerable.Range(0, (int)ts.TotalHours)
.Select(i => dt1.AddHours(i).Hour);
foreach (int hour in hoursBetween)
Console.WriteLine(hour);
Output:
15
16
17
18
19
20
21
22
23
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
The following will return the total hours between the 2 DateTime objects:
(datevalue1 - datevalue2).TotalHours
And for a custom behavior,such as displaying a list of hours, use a simple custom method on that Timespan created to get a list of hours in your desired format.
Code suggestion of the top of my head:
public List<String> GenerateHours(DateTime t1,DateTime t2){
if ((t2-t1).TotalHours >24)){
//decide what to do.
return null;
}else{
var currentHour = t2.Hour;
var list = new List<String>();
for (int i=0;i<(t2-t1).TotalHours;i++){
if (currentHour<10){
list.Add("0"+currentHour+":00");
}else if (currentHour>=10){
list.Add(currentHour+":00");
}
currentHour= (currentHour+1)%24;
}
return list;
}
}
public IEnumerable<DateTime> GetHoursBetween(DateTime start, DateTime end)
{
DateTime first = start.Date.AddHours(start.Hour);
for (DateTime dateTime = first; dateTime <= end; dateTime = dateTime.AddHours(1))
{
yield return dateTime;
}
}
TimeSpan ts = DateTime1 - DateTime2;
double totalHours = ts.TotalHours;
From MSDN: "Gets the value of the current TimeSpan structure expressed in whole and fractional hours."
EDIT: ok, now I see what you're asking for. How about this:
var d1 = DateTime.Today.AddHours(9.5);
var d2 = DateTime.Today.AddHours(14);
var first = new DateTime(d1.Year, d1.Month, d1.Day, d1.Minute == 0 ? d1.Hour : d1.Hour + 1, 0, 0);
var second = new DateTime(d2.Year, d2.Month, d2.Day, d2.Minute == 0 ? d2.Hour : d2.Hour + 1, 0, 0);
TimeSpan ts = second - first;
//returns DateTimes affected. I.e., Today at, [10:00, 11:00, 12:00, 13:00, 14:00]
IEnumerable<DateTime> dates = Enumerable.Range(0, (int)ts.TotalHours + 1).Select(hour => first.AddHours(hour));
//Or, if you just want the HOURs
//returns just ints: i.e., DateTimes 10,11,12,13,14
IEnumerable<int> hours = Enumerable.Range(0, (int)ts.TotalHours + 1).Select(hour => first.AddHours(hour).Hour);
The first method is needed if you actually have dates that span days. If you DON'T, then the second method that just returns the hours would work fine.
This should do the trick. Tested in LinqPad.
var startDate = new DateTime(2013, 8, 7, 9, 30, 0);
var endDate = new DateTime(2013, 8, 7, 14, 0, 0);
List<string> times = new List<string>();
var currentTime = startDate;
if (currentTime.Minute != 0 || currentTime.Second != 0) {
// Get next hour
currentTime = currentTime.AddHours(1).AddMinutes(currentTime.Minute * -1);
}
while (currentTime <= endDate) {
times.Add(string.Format("{0:00}:00", currentTime.Hour));
currentTime = currentTime.AddHours(1);
}
(int)Math.Abs((date1 - date2).TotalHours)
Simply subtract them and get the total of hours from the result. Something like this:
var totalHours = (dateTime1 - dateTime2).TotalHours;
Maybe something like this would work?
public static List<DateTime> GetAffectedHours(DateTime start, DateTime end)
{
List<DateTime> result = new List<DateTime>();
// Strip start of its minutes/seconds/etc
DateTime initial = new DateTime(start.Year, start.Month, start.Day, start.Hour, 0, 0);
// Go ahead and get the next hour
DateTime iterator = initial.AddHours(1.0);
// if it is still before the end
while (iterator < end)
{
// add it to the results list
result.Add(iterator);
// and get the next hour
iterator = iterator.AddHours(1.0);
}
return result;
}
You can use a For loop
List<int> allHoursBetween = new List<int>();
for (DateTime d = myStartDate; d <= myEndDate; d = d.AddHours(1))
allHoursBetween.Add(d.Hour);