Asp. NET operation all kinds of time period Acquisition Method Summary _ Practical skills

This article describes the asp.net operation of various types of time to obtain methods to share with you for your reference. Specifically as follows:

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DateTime dt = DateTime.Now; Current time

DateTime startweek = dt. AddDays (dt. 1-convert.toint32. Dayofweek.tostring ("D"))); This week Monday
DateTime Endweek = startweek.adddays (6); This Sunday

DateTime startmonth = dt. AddDays (1-DT. Day); Earlier this month
DateTime endmonth = startmonth.addmonths (1). AddDays (-1); Month End
DateTime endmonth = startmonth.adddays (dt. Addmonths (1)-DT). DAYS-1); Month End

DateTime startquarter = dt. Addmonths (dt. 0-. Month-1)%3). AddDays (1-DT. Day); At the beginning of this quarter
DateTime Endquarter = startquarter.addmonths (3). AddDays (-1); At the end of the quarter

DateTime startyear =new datetime (dt. Year, 1, 1); Early this year
DateTime endyear =new datetime (dt. Year, 12, 31); At the end of this year

As for yesterday, tomorrow, last week, last month, last quarter, last year, and so on, just AddDays (), Addmonths (), Addyears () can be combined.
Use of DateTime in C #
//If you don't understand, look at the Chinese way of showing the day of the week.
//Because 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 control one by one, in fact, not so troublesome
string[] Day =newstring[] {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
Str ING week = day[convert.toint32 (DateTime.Now.DayOfWeek.ToString ("D"))]. ToString ();

Last week, the same thing, a week is 7 days, last week is this 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, many people will say that the first day of this month is definitely number 1th, the last day is next month, one more day. Of course, it's right.
The 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

It's easier to format the characters in C # with ToString
DateTime.Now.ToString ("yyyy-mm-01");
DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). Addmonths (1). AddDays (-1). ToShortDateString ();

//Last month, minus one month
DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). Addmonths (-1). ToShortDateString ();
DateTime.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 ();
DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). Addmonths (2). AddDays (-1). ToShortDateString ();
//7 days
DateTime.Now.Date.ToShortDateString ();
DateTime.Now.AddDays (7). ToShortDateString ();
//7 days ago
DateTime.Now.AddDays (-7). ToShortDateString ();
DateTime.Now.Date.ToShortDateString ();

//This year, it is easy to figure out the first and last day of the year
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")) with the characters of ToString. ToShortDateString ();
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). Addyears (1). AddDays (-1). ToShortDateString ();
//Last year, no more explanations
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). Addyears (-1). ToShortDateString ();
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddDays (-1). ToShortDateString ();
//Next year
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). Addyears (1). ToShortDateString ();
DateTime.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 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);
Similarly, the last day of the quarter is the first day of the next quarter minus a
DateTime.Parse (DateTime.Now.AddMonths (3-(datetime.now.month-1)%3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();
Next quarter, I'm sure you all know .... Wrap
DateTime.Now.AddMonths (3-((datetime.now.month-1)%3)). ToString ("yyyy-mm-01");
DateTime.Parse (DateTime.Now.AddMonths (6-(datetime.now.month-1)%3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();
Last quarter
DateTime.Now.AddMonths ((datetime.now.month-1)%3). AddDays (1-datetime.now);
DateTime.Now.AddMonths (0-(datetime.now.month-1)%3)). AddDays (1-datetime.now.day). AddDays (-1). ToShortDateString ();

DateTime dt = DateTime.Now; Current time

DateTime startweek = dt. AddDays (dt. 1-convert.toint32. Dayofweek.tostring ("D"))); This week Monday
DateTime Endweek = startweek.adddays (6); This Sunday

DateTime startmonth = dt. AddDays (1-DT. Day); Earlier this month
DateTime endmonth = startmonth.addmonths (1). AddDays (-1); Month End
DateTime endmonth = startmonth.adddays (dt. Addmonths (1)-DT). DAYS-1); Month End

DateTime startquarter = dt. Addmonths (dt. 0-. Month-1)%3). AddDays (1-DT. Day); At the beginning of this quarter
DateTime Endquarter = startquarter.addmonths (3). AddDays (-1); At the end of the quarter

DateTime startyear =new datetime (dt. Year, 1, 1); Early this year
DateTime endyear =new datetime (dt. Year, 12, 31); At the end of this year

As for yesterday, tomorrow, last week, last month, last quarter, last year, and so on, just AddDays (), Addmonths (), Addyears () can be combined.
Use of DateTime in C #
//If you don't understand, look at the Chinese way of showing the day of the week.
//Because 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 control one by one, in fact, not so troublesome
string[] Day =newstring[] {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
Str ING week = day[convert.toint32 (DateTime.Now.DayOfWeek.ToString ("D"))]. ToString ();

Last week, the same thing, a week is 7 days, last week is this 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, many people will say that the first day of this month is definitely number 1th, the last day is next month, one more day. Of course, it's right.
The 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

It's easier to format the characters in C # with ToString
DateTime.Now.ToString ("yyyy-mm-01");
DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). Addmonths (1). AddDays (-1). ToShortDateString ();

//Last month, minus one month
DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). Addmonths (-1). ToShortDateString ();
DateTime.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 ();
DateTime.Parse (DateTime.Now.ToString ("yyyy-mm-01")). Addmonths (2). AddDays (-1). ToShortDateString ();
//7 days
DateTime.Now.Date.ToShortDateString ();
DateTime.Now.AddDays (7). ToShortDateString ();
//7 days ago
DateTime.Now.AddDays (-7). ToShortDateString ();
DateTime.Now.Date.ToShortDateString ();

//This year, it is easy to figure out the first and last day of the year
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")) with the characters of ToString. ToShortDateString ();
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). Addyears (1). AddDays (-1). ToShortDateString ();
//Last year, no more explanations
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). Addyears (-1). ToShortDateString ();
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). AddDays (-1). ToShortDateString ();
//Next year
DateTime.Parse (DateTime.Now.ToString ("yyyy-01-01")). Addyears (1). ToShortDateString ();
DateTime.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 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);
Similarly, the last day of the quarter is the first day of the next quarter minus a
DateTime.Parse (DateTime.Now.AddMonths (3-(datetime.now.month-1)%3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();
Next quarter, I'm sure you all know .... Wrap
DateTime.Now.AddMonths (3-((datetime.now.month-1)%3)). ToString ("yyyy-mm-01");
DateTime.Parse (DateTime.Now.AddMonths (6-(datetime.now.month-1)%3)). ToString ("yyyy-mm-01")). AddDays (-1). ToShortDateString ();
Last quarter
DateTime.Now.AddMonths ((datetime.now.month-1)%3). AddDays (1-datetime.now);
DateTime.Now.AddMonths (0-(datetime.now.month-1)%3)). AddDays (1-datetime.now.day). AddDays (-1). ToShortDateString ();

I hope this article will help you with the ASP.net program design.