public static DateTimeOffset GetWithMaximumMonth(this DateTimeOffset dateTime, TimeZoneInfo timeZone = null)
{
var daysInMonth = Calendar.GetDaysInMonth(dateTime.Year, 12);
if (dateTime.Day < daysInMonth)
{
daysInMonth = dateTime.Day;
}
if (timeZone == null)
{
return(new DateTimeOffset(
dateTime.Year,
12,
daysInMonth,
dateTime.Hour,
dateTime.Minute,
dateTime.Second,
dateTime.Millisecond,
dateTime.Offset));
}
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
12,
daysInMonth,
dateTime.Hour,
dateTime.Minute,
dateTime.Second,
dateTime.Millisecond,
timeZone));
}
/// <summary>
/// Check if this is a valid date.
/// </summary>
/// <param name="day"></param>
/// <param name="month"></param>
/// <param name="year"></param>
/// <returns></returns>
private static bool CheckDayValidInMonth(TimeZoneInfo timeZone, int day, int month, int year)
{
try
{
DateTimeOffsetHelper.CreateDateTime(year, month, day, 0, 0, 0, 0, timeZone);
return(true);
}
catch (ArgumentException)
{
return(false);
}
}
/// <summary>
/// Sets the field value.
/// </summary>
/// <param name="dateTime">The date time.</param>
/// <param name="field">The field.</param>
/// <param name="value">The value.</param>
/// <param name="timeZone">The time zone.</param>
/// <returns></returns>
/// <exception cref="ArgumentException">invalid datetime</exception>
public static DateTimeOffset SetFieldValue(this DateTimeOffset dateTime, int field, int value, TimeZoneInfo timeZone)
{
switch (field)
{
case DateTimeFieldEnum.MILLISEC:
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
dateTime.Month,
dateTime.Day,
dateTime.Hour,
dateTime.Minute,
dateTime.Second,
value,
timeZone));
case DateTimeFieldEnum.SECOND:
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
dateTime.Month,
dateTime.Day,
dateTime.Hour,
dateTime.Minute,
value,
dateTime.Millisecond,
timeZone));
case DateTimeFieldEnum.MINUTE:
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
dateTime.Month,
dateTime.Day,
dateTime.Hour,
value,
dateTime.Second,
dateTime.Millisecond,
timeZone));
case DateTimeFieldEnum.HOUR_OF_DAY:
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
dateTime.Month,
dateTime.Day,
value,
dateTime.Minute,
dateTime.Second,
dateTime.Millisecond,
timeZone));
case DateTimeFieldEnum.DATE:
case DateTimeFieldEnum.DAY_OF_MONTH:
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
dateTime.Month,
value,
dateTime.Hour,
dateTime.Minute,
dateTime.Second,
dateTime.Millisecond,
timeZone));
case DateTimeFieldEnum.MONTH:
return(DateTimeOffsetHelper.CreateDateTime(
dateTime.Year,
value,
dateTime.Day,
dateTime.Hour,
dateTime.Minute,
dateTime.Second,
dateTime.Millisecond,
timeZone));
case DateTimeFieldEnum.YEAR:
return(DateTimeOffsetHelper.CreateDateTime(
value,
dateTime.Month,
dateTime.Day,
dateTime.Hour,
dateTime.Minute,
dateTime.Second,
dateTime.Millisecond,
timeZone));
default:
throw new ArgumentException("invalid datetime");
}
}