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How do I calculate someone's age based on a DateTime type birthday?
(74 answers)
Closed 2 years ago.
I'm trying to convert a personnel's date of birth to their actual age within a ViewModel inside of another viewmodel I plan on calling in the front end.
I've managed to create public DateTime? PersonnelDOB { get; set; } and it's bringing back their Date of Birth I.E 6/12/1972
I need to convert this to their actual age so instead of 6/12/1972, it'll be "48 years old"
the issue to this current problem is that 'dob' is a DateTime and 'today.year' is an int. I can't subtract a DateTime from an int. I need to also make sure I account for leapyears and for it to actually accurately output their age. I also will want to check that dob isn't null. I dont have to do this within a viewmodel I created, it was just an avenue I was exploring.
Thank you all for your help!
public DateTime? PersonnelDOB { get; set; }
public PersonnelDOBViewModel()
{
var dob = PersonnelDOB;
// Save today's date.
var today = DateTime.Today;
// Calculate the age.
var age = today.Year - dob;
// Go back to the year the person was born in case of a leap year
if (dob > today.AddYears(-age)) age--;
return age;
}
** A coworker helped me out and for those of you interested in the right answer - here it is
public DateTime? PersonnelDOB { get; set; }
public int? PersonnelAge
{
get
{
if (!PersonnelDOB.HasValue)
return null;
DateTime today = DateTime.Today;
int years = today.Year - PersonnelDOB.Value.Year;
years -= (today.Month < PersonnelDOB.Value.Month || (today.Month == PersonnelDOB.Value.Month && today.Day < PersonnelDOB.Value.Day)) ? 1 : 0;
return years;
}
}
If it were me, I'd lean on NodaTime for this since you can calculate the Period between the date-of-birth and "today".
Per NodaTime's documentation:
A Period is a number of years, months, weeks, days, hours and so on, which can be added to (or subtracted from) a LocalDateTime, LocalDate or LocalTime. The amount of elapsed time represented by a Period isn't fixed: a period of "one month" is effectively longer when added to January 1st than when added to February 1st, because February is always shorter than January.
There's even a "recipe" for what you're trying to do within the documentation.
Adapted to your view model, it could look something like this:
public class PersonnelDOBViewModel
{
private readonly ZonedClock _clock;
public PersonnelDOBViewModel()
{
// Depending on your goals, you may want to use a user-defined
// time zone here
var timezone = DateTimeZoneProviders.Tzdb.GetSystemDefault();
_clock = SystemClock.Instance.InZone(timezone);
}
public DateTime? PersonnelDOB { get; set; }
public int? Age
{
get
{
if (PersonnelDOB == null)
{
return null;
}
var dob = LocalDate.FromDateTime(PersonnelDOB.Value);
var today = _clock.GetCurrentDate();
return Period.Between(dob, today).Years;
}
}
}
Try using DateTime.Now (or DateTime.UtcNow) instead of DateTime.Today.Year.
Also keep in mind that age calculations get tricky when you take time zone into account.
var age = dob.HasValue ? GetAge(dob.Value, DateTime.Now) : (int?)null;
private int GetAge(DateTime dob, DateTime currentTime)
{
var years = currentTime.Year - dob.Year;
if (currentTime.Month < dob.Month || (currentTime.Month == dob.Month && currentTime.Day < dob.Day))
{
years--;
}
return years;
}
Related
I want to calculate the start DateTime and end DateTime of the current week. First of all I created a class holding both information
internal class ReportTimeSpan
{
public DateTime From { get; set; }
public DateTime To { get; set; }
}
After that this is my calculation
public ReportTimeSpan GetTimeSpanForThisWeek()
{
int amountOfDays = GetAmountOfWeekDays();
int currentDayIndex = GetCurrentWeekDayIndex();
DateTime weekStart = DateTime.Now.AddDays(-currentDayIndex);
int differenceCurrentDayIndexToLastDayIndex = amountOfDays - currentDayIndex;
DateTime weekEnd = DateTime.Now.AddDays(differenceCurrentDayIndexToLastDayIndex);
return new ReportTimeSpan()
{
From = weekStart,
To = weekEnd
};
}
private int GetAmountOfWeekDays()
{
string[] dayNames = Enum.GetNames(typeof(DayOfWeek));
return dayNames.Length;
}
private int GetCurrentWeekDayIndex()
{
DayOfWeek dayOfWeek = DateTime.Now.DayOfWeek;
return (int)dayOfWeek;
}
}
The date of both values is correct, but the time is wrong.
The variable weekStart should have a time of "00:00:00"
The variable weekEnd should have a time of "23:59:59" (not sure about that)
Are there any methods I can use for this? (I don't want to use external packages)
I expect you want something like this:
weekStart = DateTime.Now.AddDays(-currentDayIndex).Date;
As Tim notes, you can simplify this to:
weekStart = DateTime.Today.AddDays(-currentDayIndex);
.Date will remove the time component, so you're just left with the date and a 00:00:00 time. .Today will return today's date without a time component.
For weekEnd, we should add the number of days in the week to weekStart, and then step back 1 tick to take it back into the previous day:
weekEnd = weekStart.AddDays(7).AddTicks(-1);
You could also use .AddMilliseconds(-1), .AddSeconds(-1), or whatever amount you require to safely be inside the previous day (some databases will have less than tick precision, etc.).
If you have some reason for using GetAmountOfWeekDays() then substitute 7 in the above with GetAmountOfWeekDays().
Depending on what you're using this for, you might be better off with an inclusive weekStart and an exclusive nextWeekStart comparison:
weekStart = DateTime.Now.AddDays(-currentDayIndex).Date;
nextWeekStart = weekStart.AddDays(7);
bool isInWeek = someDate >= weekStart && somedate < nextWeekStart;
weekStart = weekStart.Date;
weekEnd = weekEnd.AddHours(23).AddMinutes(59).AddSeconds(59).AddMilliseconds(999);
OR
weekStart = weekStart.Date;
weekEnd = weekEnd.AddHours(24).AddMilliseconds(-1);
OR
weekStart = weekStart.Date;
weekEnd = new DateTime(weekEnd .Year, weekEnd .Month, weekEnd .Day, 23, 59, 59);
I am having a tough time in calculating the number of custom defined weekends and later finding them over a specified date range, I have to apply different rates based on the days (weekends, season days & normal days).
For example, a trip is starting at 16/08/2017 09:00:00 and ending at 29/08/2017 09:00:00 where as my weekend start at Fri 15:00:00 till Mon 09:00:00 every week. I need to calculate how many weekends occur in the given trip start and end time and how many regular days, as both are charged at different rates. Any help is appreciated.
Please note that all the date and times will be dynamic and can be changed, so looking for a generic solution
If your range is small enough you can try:
public class DateTimeRange
{
private DateTime Start { get; set; }
private DateTime End { get; set; }
public DateTimeRange(DateTime start, DateTime end)
{
Start = start;
End = end;
}
public int DayOffsCount()
{
var current = Start;
var dayOffsCount = 0;
while (current < End)
{
if (IsDayOff(current))
{
dayOffsCount++;
}
current = current.AddDays(1);
}
return dayOffsCount;
}
}
public bool IsDayOff(DateTime dt)
{
if (dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday)
return true;
return IsHoliday(dt);
}
I have to write a program that reads birthday date from the console (in the format MM.DD.YYYY) and prints current age and age in 10 years.
This is one of my first codes and in my opinion it looks too lame. I believe there is a better way to write this, so I would like to ask you for suggestions on how to optimize the code.
using System;
namespace Age
{
class Age
{
static void Main()
{
string birthDayAsk;
Console.WriteLine("Date format: MM.DD.YYYY");
birthDayAsk = Console.ReadLine();
DateTime birthday = DateTime.Parse(birthDayAsk);
DateTime today = DateTime.Today;
int age = today.Year - birthday.Year;
if ((birthday.Month > today.Month) || ((birthday.Month == today.Month) && (birthday.Day > today.Day)))
{
age = age - 1;
Console.WriteLine(age);
}
else
{
Console.WriteLine(age);
}
Console.WriteLine(age + 10);
}
}
}
I think its best to use TimeSpan to calculate difference between two dates Determining the Span Between Two Dates
Also to add the years do age.AddYears(10);
Im trying to produce a simple method which can receive a financial year period in the following format:
2014-2015
I need the method to return a DateTime object, specifically the first day of that financial period, in the above case this would be 01/04/2014 00:00:00.000
I will also need to ultimately be able to work out the last day of that financial period but im not sure whether or not this should be a different method all together or in the same method with an additional parameter to indicate which date is required.
So far all I have been able to come up with is:
public static DateTime PermitValidFrom (string financialYear)
{
string startFinancialYear;
string endFinancialYear;
DateTime startOfFinancialYear;
startFinancialYear = financialYear.Substring(1, 4);
endFinancialYear = financialYear.Substring(6, 4);
//need to work out start of the financial year based on this period
return startOfFinancialYear;
}
I just don't know how to approach giving startOfFinancialYear a value, or even if there is a better way of going about doing this all together.
Apologies if this has been answered previously, but all I can find is examples which work out the start of a financial year based on the current DateTime.Now value, in my case this value may be different every time the method is invoked.
To clarify my question, the facts surrounding my task were the following:
Financial Year Start in this scenario will ALWAYS be 01/04 (the first of April)
Financial Year End in this scenario will ALWAYS be the last day of March.
If this is a Saturday, Sunday or any other day in this scenario is irrelevant.
All I have to go on is two years separated by a hyphen, from this I need the start of that financial year and the end of that financial year. I think the facts are pretty straight forward.
Anyway, seen as I received down votes and no real constructive feedback I ended up coming up with my own solution, and thought I would post it in case it helps anyone else.
public static DateTime FinancialPeriods(string financialYear, bool end)
{
string startFinancialYear;
string endFinancialYear;
DateTime startOfFinancialYear;
DateTime endOfFinancialYear;
startFinancialYear = financialYear.Substring(0, 4);
endFinancialYear = financialYear.Substring(5, 4);
startOfFinancialYear = new DateTime(int.Parse(startFinancialYear), 4, 1);
endOfFinancialYear = new DateTime(int.Parse(endFinancialYear), 4, 1).AddDays(-1);
if (end == false)
{
return startOfFinancialYear;
}
else
{
return endOfFinancialYear;
}
}
I would roll your own type, something like this:-
using System;
using System.Text.RegularExpressions;
public class FinancialPeriod
{
const string PATTERN = #"^([0-9]{4})\s?-\s?([0-9]{4})$";
public FinancialPeriod()
{
this.Year = DateTime.Today.Year;
if (DateTime.Today.Month > 3)
{
this.From = new DateTime(Year, 4, 1);
this.To = new DateTime(Year + 1, 3, DaysInMarch(Year + 1));
}
else
{
this.From = new DateTime(Year - 1, 4, 1);
this.To = new DateTime(Year, 3, DaysInMarch(Year));
}
}
public FinancialPeriod(string period) : this()
{
Match m = Regex.Match(period, PATTERN);
this.From = new DateTime(Int32.Parse(m.Groups[1].Value), 4, 1);
this.To = new DateTime(Int32.Parse(m.Groups[2].Value), 3, DaysInMarch(Int32.Parse(m.Groups[2].Value)));
}
private DateTime From { get; set; }
private DateTime To { get; set; }
private int Year { get; set; }
public string period
{
get
{
return string.Format("{0} - {1}", this.From.Year, this.To.Year);
}
}
private int DaysInMarch(int yr)
{
return DateTime.DaysInMonth(yr, 03);
}
}
Fiddle here
I want to find the service period of the employee ,i already get the employee join date from database its like that
ex - join Date: 2007/03/24
Now I need to find the difference between system date and join date if any one can have idea about that please help me thanks.
sample code which i wrote to get answer ,but it not work correctly
public TimeSpan periodOfService
{
get
{
//DateOfJoin-->which i get from my database
DateTime JoinDate = Convert.ToDateTime(DateOfJoin);
DateTime TodayData = DateTime.Now;
TimeSpan servicePeriod = JoinDate - TodayData;
return servicePeriod;
}
}
out put format - >2 years, 3 months
How can I do this in Asp.net MVC 4?
First of all, swap the dates around.
You want to subtract JoinDate from TodayData (also revise spellings and naming conventions):
public TimeSpan periodOfService
{
get
{
//DateOfJoin-->which i get from my database
DateTime JoinDate = Convert.ToDateTime(DateOfJoin);
DateTime TodayData = DateTime.Now;
TimeSpan servicePeriod = TodayData - JoinDate;
return servicePeriod;
}
}
Unfortunately, OP, outputting this TimeSpan value in the format you'd like is a lot trickier than you'd initially think, see the following article for how to achieve that:
http://joelfillmore.com/years-and-months-between-dates/
I'd recommend you read up on the solution it suggests and then look into using the method:
public DateSpan(DateTime startDate, DateTime endDate)
Normally you will use a TimeSpan to represent the difference between to dates but your requirement to display the difference as years and months makes TimeSpan unsuitable. Instead you can create a class to represent the difference:
class DateDifference {
public DateDifference(Int32 years, Int32 months) {
Years = years;
Months = months;
}
public Int32 Years { get; private set; }
public Int32 Months { get; private set; }
}
You can the calculate the difference between two dates using simple arithmetic:
DateDifference GetDateDifference(DateTime first, DateTime second) {
if (second < first)
throw new ArgumentOutOfRangeException("second", "The second date cannot occur before the first.");
var years = second.Year - first.Year;
var months = second.Month - first.Month;
if (second.Month < first.Month) {
years -= 1;
months += 12;
}
return new DateDifference(years, months);
}
You can then use the function in your code:
var dateDifference = GetDateDifference(JoinDate, TodayDate);
This will get you the difference between the two dates, regardless of if it's in the future or in the past.
If it's an invalid date, a zero span is returned
public TimeSpan periodOfService
{
get
{
DateTime JoinDate;
if (DateTime.TryParse(DateOfJoin, out JoinDate))
{
return DateTime.Now > JoinDate ? DateTime.Now - JoinDate : JoinDate - DateTime.Now;
}
return TimeSpan.Zero;
}
}
You Can Get Total Day Diff And Convert it To Month And Year
a Simple Sample is here
TimeSpan servicePeriod = TodayData - JoinDate;
string result = string.Format("{0} Years, {1} Months, {2} Days", servicePeriod.TotalDays / 365, servicePeriod.TotalDays / 30, servicePeriod.TotalDays);
you Can Return a string not a timespan