# NET (C #) time subtraction to get days, hours, minutes, seconds difference

Source: Internet
Author: User

`NET (C #) Time subtraction gets days, hours, minutes, seconds difference datetime dtone = Convert.todatetime ("2007-1-1 05:00:00");        DateTime dtwo = Convert.todatetime ("2007-1-5 08:00:00");        TimeSpan span = Dtone. Subtract (Dtwo); The algorithm is Dtone minus Dtwo        TSS. Text = span. Days + "Day" + span. Hours + "hour" + span. Minutes + "Minutes" + span. seconds+ "seconds" + span. Totaldays;`

DateTime date Plus, minus

`DateTime dt = DateTime.Now; The current time datetime startweek = dt. AddDays (1-convert.toint32 (dt. Dayofweek.tostring ("D"))); This week Monday datetime endweek = startweek.adddays (6); This week Sunday datetime startmonth = dt. AddDays (1-DT. Day); This month, datetime endmonth = startmonth.addmonths (1). AddDays (-1); At the end of this month//datetime endmonth = startmonth.adddays (dt. AddMonths (1)-DT). DAYS-1); Month-end datetime startquarter = dt. AddMonths (0-(dt. MONTH-1)% 3). AddDays (1-DT. Day); At the beginning of the quarter datetime endquarter = startquarter.addmonths (3). AddDays (-1); The end of the quarter datetime startyear = new datetime (dt. Year, 1, 1); Early this year datetime endyear = new datetime (dt. Year, 12, 31); The end of this year as for yesterday, tomorrow, last week, last month, last quarter, last year and so on, as long as adddays (), AddMonths (), AddYears () The combination of several methods can be. Use of DateTime in C #//If you do not understand, then look at the Chinese display of the day of the method should understand//because the DayOfWeek return is the number of days of the week, we want to convert it into Chinese characters convenient for us to read, some people may use switch to a control, In fact, not so troublesome string[] day = new string[] {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};string week = Day[convert.toint32 (DateTime.Now.DayOfWeek.ToString ("D"))]. ToString ();//Last week, similarly, a week was 7 days, last weekThis week minus 7 days, and next week is the same DateTime.Now.AddDays (Convert.ToInt32 (1-convert.toint32 (DateTime.Now.DayOfWeek))-7); Last Monday DateTime.Now.AddDays (Convert.ToInt32 (1-convert.toint32 (DateTime.Now.DayOfWeek))-7). AddDays (6); Last weekend (Sunday)//next week DateTime.Now.AddDays (Convert.ToInt32 (1-convert.toint32 (DateTime.Now.DayOfWeek) + 7); Next Monday DateTime.Now.AddDays (Convert.ToInt32 (1-convert.toint32 (DateTime.Now.DayOfWeek) + 7). AddDays (6); Next weekend//This month, a lot of people will say the first day of this month is definitely number 1th, the last day is the next month, minus another day. Of course, this is the right//general wording DateTime.Now.Year.ToString () + DateTime.Now.Month.ToString () + "1"; First day DateTime.Parse (DateTime.Now.Year.ToString () + DateTime.Now.Month.ToString () + "1"). AddMonths (1). AddDays (-1). ToShortDateString ();//Last day 1). ToShortDateString ();//The Last day//skillfully using the C # ToString character formatting simpler DateTime.Now.ToString ("yyyy-mm-01");D Atetime.parse ( DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (1). AddDays (-1). ToShortDateString ();//Last month, subtract one month datetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (-1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToStriNg ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();//next month, add a month datetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (2). AddDays (-1). ToShortDateString ();//7 Tin Hau DateTime.Now.Date.ToShortDateString ();D ateTime.Now.AddDays (7). ToShortDateString ();//7 days ago DateTime.Now.AddDays (-7). ToShortDateString ();D ateTime.Now.Date.ToShortDateString ();//This year, Formatting with ToString character we also easily calculate the first and last day of the year DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (1). AddDays (-1). ToShortDateString ();//Last year, no more explaining DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (-1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-01-01")). AddDays (-1). ToShortDateString ();//Next year DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (2). AddDays (-1). ToShortDateString ();//this seasondegree, 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, a quarter of three months//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. DateTime.Now.AddMonths (0-(DateTime.Now.Month- 1) (% 3)). AddDays (1-datetime.now.day);//In the same vein, the last day of the quarter is the first day of the next quarter minus one DateTime.Parse (DateTime.Now.AddMonths (3-( DATETIME.NOW.MONTH-1) (% 3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();D ateTime.Now.AddMonths (3-(((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01");D Atetime.parse (DateTime.Now.AddMonths (6-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();//Last quarter DateTime.Now.AddMonths ( -3-(((datetime.now.month-1)% 3)). AddDays (1-datetime.now);D ateTime.Now.AddMonths (0-((datetime.now.month-1)% 3)). AddDays (1-datetime.now.day). AddDays (-1). ToShortDateString ();//Today DateTime.Now.Date.ToShortDateString ();//Yesterday, that is today's date minus one DateTime.Now.AddDays (-1). ToShortDateString ();//Tomorrow, similarly, add a DateTime.Now.AddDays (1). ToShortDateString ();//this week (to know that the first day of the week is the day of the week, so 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 DateTime.Now.AddDays(Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek))). ToShortDateString ();D ateTime.Now.AddDays (convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek))). ToShortDateString ();//If you do not understand, then look at the Chinese display of the day of the method should be understood//Because DayOfWeek returns is the number of days of the week, we have to convert it into Chinese characters to facilitate our reading, Some people may use switch to a control, in fact, not so troublesome string[] day = new string[] {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};D Ay[convert . ToInt16 (DateTime.Now.DayOfWeek)];//last week, similarly, a week is 7 days, last week is this week minus 7 days, next week is the same DateTime.Now.AddDays (convert.todouble (0- Convert.ToInt16 (DateTime.Now.DayOfWeek)))-7). ToShortDateString ();D ateTime.Now.AddDays (convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek))-7). ToShortDateString ()///next week DateTime.Now.AddDays (Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek)) + 7). ToShortDateString ();D ateTime.Now.AddDays (convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek)) + 7). ToShortDateString ();///This month, many people will say that the first day of this month is certainly number 1th, the last day is the next month and another day. Of course it's right.//General wording DateTime.Now.Year.ToString () + DateTime.Now.Month.ToString () + "1"; First day DateTime.Parse (DateTime.Now.Year.ToString () + DateTime.Now.Month.ToString () + "1"). AddMonths (1). AddDays (-1). ToShortDateString ();//The Last day//skillfully using the C # ToString character formatting simpler DateTime.Now.ToString ("yyyy-mm-01");D Atetime.parse ( DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (1). AddDays (-1). ToShortDateString ();//Last month, subtract one month datetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (-1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();//next month, add a month datetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-mm-01")). AddMonths (2). AddDays (-1). ToShortDateString ();//7 Tin Hau DateTime.Now.Date.ToShortDateString ();D ateTime.Now.AddDays (7). ToShortDateString ();//7 days ago DateTime.Now.AddDays (-7). ToShortDateString ();D ateTime.Now.Date.ToShortDateString ();//This year, Formatting with ToString character we also easily calculate the first and last day of the year DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). ToShortDateString ();D Atetime.parse (DateTime. Now.tostring ("yyyy-01-01")). AddYears (1). AddDays (-1). ToShortDateString ();//Last year, no more explaining DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (-1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-01-01")). AddDays (-1). ToShortDateString ();//Next year DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (1). ToShortDateString ();D Atetime.parse (DateTime.Now.ToString ("yyyy-01-01")). AddYears (2). AddDays (-1). ToShortDateString ();//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, a quarter of three months//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. DateTime.Now.AddMonths (0-(DateTime.Now.Month- 1) (% 3)). ToString ("yyyy-mm-01");//Similarly, the last day of the quarter is the first day of the next quarter minus one DateTime.Parse (DateTime.Now.AddMonths (3-(DATETIME.NOW.MONTH-1) % 3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();//Next quarter, I believe you all know .... DateTime.Now.AddMonths (3-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01");D Atetime.parse (DateTime.Now.AddMonths (6-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString();//Last quarter DateTime.Now.AddMonths ( -3-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01");D atetime.parse (DateTime.Now.AddMonths (0-((datetime.now.month-1)% 3)). ToString ("yyyy-mm-01")). AddDays (-1).  ToShortDateString ();`

NET (C #) time subtraction to get days, hours, minutes, seconds difference

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