C # datetime date plus 1 days minus one month minus one month, etc method

Source: Internet
Author: User

  1. Today
  2. DateTime.Now.Date.ToShortDateString ();
  3. Yesterday, it was today's date minus one.
  4. DateTime.Now.AddDays (-1). ToShortDateString ();
  5. Tomorrow, in the same vein, add a
  6. DateTime.Now.AddDays (1). ToShortDateString ();
  7. This week, knowing that the day of the week is the first day of the week and that the first day of the week is a few days ago, it is important to note that every week here is from Sunday to Saturday
  8. DateTime.Now.AddDays (Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek))). ToShortDateString ();
  9. DateTime.Now.AddDays (Convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek))). ToShortDateString ();
  10. If you do not understand, then look at the Chinese display of the day of the week should understand the method
  11. Since DayOfWeek returns the number of days of the week, we want to convert it into Chinese characters to facilitate our reading, some people may use switch to a control, in fact, not so troublesome
  12. string[] Day = new string[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
  13. Day[convert.toint16 (DateTime.Now.DayOfWeek)];
  14. Last week, the same thing, a week is 7 days, last week is this week minus 7 days, and next week is the same
  15. DateTime.Now.AddDays (Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek))-7). ToShortDateString ();
  16. DateTime.Now.AddDays (Convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek))-7). ToShortDateString ();
  17. Next week
  18. DateTime.Now.AddDays (Convert.todouble ((0-convert.toint16 (DateTime.Now.DayOfWeek)) + 7). ToShortDateString ();
  19. DateTime.Now.AddDays (Convert.todouble ((6-convert.toint16 (DateTime.Now.DayOfWeek)) + 7). ToShortDateString ();
  20. This month, many people will say that the first day of this month is definitely number 1th, and the last day is the next month minus another day. Of course it's right.
  21. The general wording
  22. DateTime.Now.Year.ToString () + DateTime.Now.Month.ToString () + "1"; //First day
  23. DateTime.Parse (DateTime.Now.Year.ToString () + DateTime.Now.Month.ToString () + "1"). AddMonths (1). AddDays (-1). ToShortDateString (); //Last day
  24. It's easier to use ToString's character formatting in C #
  25. DateTime.Now.ToString ("yyyy-mm-01");
  26. DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (1). AddDays (-1).   ToShortDateString ();
  27. Last month, minus one month
  28. DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (-1).   ToShortDateString ();
  29. DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). AddDays (-1).   ToShortDateString ();
  30. Next month, add a month.
  31. DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (1).   ToShortDateString ();
  32. DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (2). AddDays (-1).   ToShortDateString ();
  33. After 7 days
  34. DateTime.Now.Date.ToShortDateString ();
  35. DateTime.Now.AddDays (7). ToShortDateString ();
  36. 7 days ago
  37. DateTime.Now.AddDays (-7). ToShortDateString ();
  38. DateTime.Now.Date.ToShortDateString ();
  39. This year, formatting with ToString's characters makes it easy to figure out the first and last day of the year
  40. DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")).   ToShortDateString ();
  41. DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (1). AddDays (-1).   ToShortDateString ();
  42. Last year, no more explaining.
  43. DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (-1).   ToShortDateString ();
  44. DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddDays (-1).   ToShortDateString ();
  45. Next year
  46. DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (1).   ToShortDateString ();
  47. DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (2). AddDays (-1).   ToShortDateString ();
  48. This quarter, many people will feel the difficulty here, need to write a long process to judge. In fact, we all know that four quarters a year, three months a quarter
  49. First we push the date to the first month of the quarter, and then the first day of the month is the first day of the quarter.
  50. DateTime.Now.AddMonths (0-((datetime.now.month-1)% 3)).   ToString ("yyyy-mm-01");
  51. Similarly, the last day of the quarter is the first day of the next quarter minus one
  52. DateTime.Parse (DateTime.Now.AddMonths (3-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01")). AddDays (-1).   ToShortDateString ();
  53. Next quarter, I believe you all know .... Call it
  54. DateTime.Now.AddMonths (3-((datetime.now.month-1)% 3)).   ToString ("yyyy-mm-01");
  55. DateTime.Parse (DateTime.Now.AddMonths (6-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01")). AddDays (-1).   ToShortDateString ();
  56. Last quarter
  57. DateTime.Now.AddMonths ( -3-((datetime.now.month-1)% 3)).   ToString ("yyyy-mm-01");
  58. DateTime.Parse (DateTime.Now.AddMonths (0-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01")). AddDays (-1).  ToShortDateString ();

C # datetime date plus 1 days minus one day plus month minus one month etc method (turn)

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