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DateHelper.cs
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DateHelper.cs
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using System;
using System.Globalization;
namespace AntDesign
{
public static class DateHelper
{
private static readonly System.Globalization.Calendar _calendar = CultureInfo.InvariantCulture.Calendar;
private const int DECADE_YEAR_COUNT = 10;
private const int QUARTER_MONTH_COUNT = 3;
public static bool IsSameDate(DateTime? date, DateTime? compareDate)
{
if (date is null || compareDate is null)
return false;
return date == compareDate;
}
public static bool IsSameYear(DateTime? date, DateTime? compareDate)
{
if (date is null || compareDate is null)
return false;
return date.Value.Year == compareDate.Value.Year;
}
public static bool IsSameMonth(DateTime? date, DateTime? compareDate)
{
if (date is null || compareDate is null)
return false;
return IsSameYear(date, compareDate)
&& date.Value.Month == compareDate.Value.Month;
}
public static bool IsSameDay(DateTime? date, DateTime? compareDate)
{
if (date is null || compareDate is null)
return false;
return IsSameYear(date, compareDate)
&& _calendar.GetDayOfYear(date.Value) == _calendar.GetDayOfYear(compareDate.Value);
}
public static bool IsSameWeek(DateTime? date, DateTime? compareDate, DayOfWeek firstDayOfWeek)
{
if (date is null || compareDate is null)
return false;
return IsSameYear(date, compareDate)
&& GetWeekOfYear(date.Value, firstDayOfWeek) == GetWeekOfYear(compareDate.Value, firstDayOfWeek);
}
public static bool IsSameQuarter(DateTime? date, DateTime? compareDate)
{
if (date is null || compareDate is null)
return false;
return IsSameYear(date, compareDate)
&& GetDayOfQuarter(date.Value) == GetDayOfQuarter(compareDate.Value);
}
public static string GetDayOfQuarter(DateTime date)
{
return $"Q{GetQuarter(date)}";
}
public static int GetQuarter(DateTime date)
{
int offset = date.Month % QUARTER_MONTH_COUNT > 0 ? 1 : 0;
return date.Month / QUARTER_MONTH_COUNT + offset;
}
public static DateTime GetStartDateOfQuarter(DateTime date)
{
int quarter = GetQuarter(date);
return new DateTime(date.Year, 1 + ((quarter - 1) * QUARTER_MONTH_COUNT), 1);
}
public static int GetWeekOfYear(DateTime date, DayOfWeek firstDayOfWeek)
{
return _calendar.GetWeekOfYear(date, CalendarWeekRule.FirstDay, firstDayOfWeek);
}
/// <summary>
/// for example,
/// when currentDateTime is 2020-01-04 05:34:55 then:
/// the next date shouble be 2030-01-01 00:00:00, it's the start date of next 10 years
///
/// when currentDateTime is 2023-01-04 05:34:55 then:
/// the next date shouble be 2030-01-01 00:00:00, it's the start date of next 10 years
///
/// when currentDateTime is 2018-01-04 05:34:55 then:
/// the next date shouble be 2020-01-01 00:00:00, it's the start date of next 10 years
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static DateTime GetNextStartDateOfDecade(DateTime date)
{
int year = date.Year / DECADE_YEAR_COUNT * DECADE_YEAR_COUNT;
if (year < DateTime.MinValue.Year)
{
year = DateTime.MinValue.Year;
}
return AddYearsSafely(new DateTime(year, 1, 1), DECADE_YEAR_COUNT);
}
/// <summary>
/// for example, when currentDateTime is 2020-01-04 05:34:55 then:
/// the next date shouble be 2021-01-01 00:00:00, it's the start date of next year
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static DateTime GetNextStartDateOfYear(DateTime date)
{
return AddYearsSafely(new DateTime(date.Year, 1, 1), 1);
}
/// <summary>
/// for example, when currentDateTime is 2020-01-04 05:34:55 then:
/// the next date shouble be 2020-04-01 00:00:00, it's the start date of the next quarter in 2020
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static DateTime GetNextStartDateOfQuarter(DateTime date)
{
var nextQuarterDate = AddMonthsSafely(new DateTime(date.Year, date.Month, 1), QUARTER_MONTH_COUNT);
return GetStartDateOfQuarter(nextQuarterDate);
}
/// <summary>
/// for example, when currentDateTime is 2020-01-04 05:34:55 then:
/// the next date shouble be 2020-02-01 00:00:00 , it's the start date of next month
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static DateTime GetNextStartDateOfMonth(DateTime date)
{
return AddMonthsSafely(new DateTime(date.Year, date.Month, 1), 1);
}
/// <summary>
/// for example, when currentDateTime is 2020-01-04 05:34:55 then:
/// the next date shouble be 2021-01-05 00:00:00, it's the start date of next day
/// </summary>
/// <param name="date"></param>
/// <returns></returns>
public static DateTime GetNextStartDateOfDay(DateTime date)
{
return AddDaysSafely(new DateTime(date.Year, date.Month, date.Day), 1);
}
public static DateTime CombineNewDate(
DateTime date,
int? year = null,
int? month = null,
int? day = null,
int? hour = null,
int? minute = null,
int? second = null)
{
var yearValue = year ?? date.Year;
var monthValue = month ?? date.Month;
var dayValue = day ?? date.Day;
var daysInMonth = DateTime.DaysInMonth(yearValue, monthValue);
dayValue = dayValue > daysInMonth ? daysInMonth : dayValue;
return new DateTime(yearValue, monthValue, dayValue, hour ?? date.Hour, minute ?? date.Minute, second ?? date.Second);
}
public static DateTime? FormatDateByPicker(DateTime? dateTime, string picker)
{
if (dateTime == null)
{
return null;
}
return FormatDateByPicker((DateTime)dateTime, picker);
}
public static DateTime FormatDateByPicker(DateTime dateTime, string picker)
{
switch (picker)
{
case DatePickerType.Date: return dateTime.Date;
case DatePickerType.Year: return new DateTime(dateTime.Year, 1, 1);
case DatePickerType.Month: return new DateTime(dateTime.Year, dateTime.Month, 1);
case DatePickerType.Quarter: return new DateTime(dateTime.Year, dateTime.Month, 1);
}
return dateTime;
}
/// <summary>
/// 用该函数来执行AddYears逻辑, 不会触发System.ArgumentOutOfRangeException异常
/// AddYears by the function would never throw System.ArgumentOutOfRangeException
/// </summary>
/// <param name="currentDate"></param>
/// <param name="value"></param>
/// <returns></returns>
public static DateTime AddYearsSafely(DateTime currentDate, int value)
{
int newYear = currentDate.Year + value;
if (newYear < DateTime.MinValue.Year)
{
value = DateTime.MinValue.Year - currentDate.Year;
}
else if (newYear > DateTime.MaxValue.Year)
{
value = DateTime.MaxValue.Year - currentDate.Year;
}
return currentDate.AddYears(value);
}
/// <summary>
/// 用该函数来执行AddMonths逻辑, 不会触发System.ArgumentOutOfRangeException异常
/// AddMonths by the function would never throw System.ArgumentOutOfRangeException
/// </summary>
/// <param name="currentDate"></param>
/// <param name="value"></param>
/// <returns></returns>
public static DateTime AddMonthsSafely(DateTime currentDate, int value)
{
int newMonth = currentDate.Month + value;
/* at min date value */
if (currentDate.Year == DateTime.MinValue.Year && newMonth < DateTime.MinValue.Month)
{
value = DateTime.MinValue.Month - currentDate.Month;
}
/* at max date value */
if (currentDate.Year == DateTime.MaxValue.Year && newMonth > DateTime.MaxValue.Month)
{
value = DateTime.MaxValue.Month - currentDate.Month;
}
return currentDate.AddMonths(value);
}
/// <summary>
/// 用该函数来执行AddDays逻辑, 不会触发System.ArgumentOutOfRangeException异常
/// AddDays by the function would never throw System.ArgumentOutOfRangeException
/// </summary>
/// <param name="currentDate"></param>
/// <param name="value"></param>
/// <returns></returns>
public static DateTime AddDaysSafely(DateTime currentDate, int value)
{
int newDay = currentDate.Day + value;
/* at min date value */
if (currentDate.Year == DateTime.MinValue.Year
&& currentDate.Month == DateTime.MinValue.Month
&& newDay < DateTime.MinValue.Day)
{
value = DateTime.MinValue.Day - currentDate.Day;
}
/* at max date value */
if (currentDate.Year == DateTime.MaxValue.Year
&& currentDate.Month == DateTime.MaxValue.Month
&& newDay > DateTime.MaxValue.Day)
{
value = DateTime.MaxValue.Day - currentDate.Day;
}
return currentDate.AddDays(value);
}
public static bool IsSameDecade(DateTime? date, DateTime? compareDate)
{
if (date is null || compareDate is null)
return false;
var num1 = Math.Floor(date.Value.Year / 10d);
var num2 = Math.Floor(compareDate.Value.Year / 10d);
return num1 == num2;
}
}
}