How do I get the last day of a month

Question

How can I find the last day of the month in C    For example  if I have the date 03 08 1980  how do I get the last day of month 8  in this case 31

User · Answer

You can find the last day of the month by a single line of code   int maxdt    new DateTime dtfrom Year  dtfrom Month  1  AddMonths 1  AddDays -1   Day

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Use any date you want  for the purpose of this example we use 1980-08-03  var myDate   new DateTime 1980 8 3   var lastDayOfMonth   new DateTime myDate Year  myDate Month  DateTime DaysInMonth myDate Year  myDate Month

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The last day of the month you get like this  which returns 31   DateTime DaysInMonth 1980  08

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From DateTimePicker   First date   DateTime first date   new DateTime DateTimePicker Value Year  DateTimePicker Value Month  1     Last date   DateTime last date   new DateTime DateTimePicker Value Year  DateTimePicker Value Month  DateTime DaysInMonth DateTimePicker Value Year  DateTimePicker Value Month

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var lastDayOfMonth   DateTime DaysInMonth date Year  date Month

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To get last day of a month in a specific calendar - and in an extension method -   public static int DaysInMonthBy this DateTime src  Calendar calendar        var year   calendar GetYear src                        year of src in your calendar     var month   calendar GetMonth src                      month of src in your calendar     var lastDay   calendar GetDaysInMonth year  month      days in month means last day of that month in your calendar     return lastDay

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Substract a day from the first of next month   DateTime lastDay   new DateTime MyDate Year MyDate Month 1 1  AddDays -1     Also  in case you need it to work for December too   DateTime lastDay   new DateTime MyDate Year MyDate Month 1  AddMonths 1  AddDays -1

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If you want the date  given a month and a year  this seems about right   public static DateTime GetLastDayOfMonth this DateTime dateTime        return new DateTime dateTime Year  dateTime Month  DateTime DaysInMonth dateTime Year  dateTime Month

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This formula reflects  RHSeeger s thought as a simple solution to get  in this example  the last day of the 3rd month  month of date in cell A1   4 with the first day of that month minus 1 day    DATE YEAR A1  MONTH A1  4 1 -1  Very precise  inclusive February s in leap years

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You can find the last date of any month by this code   var now   DateTime Now  var startOfMonth   new DateTime now Year  now Month  1   var DaysInMonth   DateTime DaysInMonth now Year  now Month   var lastDay   new DateTime now Year  now Month  DaysInMonth

User · Answer

I don t know C  but  if it turns out there s not a convenient API way to get it  one of the ways you can do so is by following the logic   today - gt   1 month - gt  set day of month to 1 - gt  -1 day   Of course  that assumes you have date math of that type

[c#] How do I get the last day of a month?

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