As you work, write a help document that you keep for yourself.
System.DateTime currenttime=new System.DateTime (); Instantiating a DateTime object
The current month day time minute currenttime=system.datetime.now;
Current year int year =currenttime.year;
Current month int month =currenttime.month;
The current day int day =currenttime.day;
=currenttime.hour at current time int;
The current minute int is divided into =currenttime.minute;
Current second int second =currenttime.second;
Current millisecond int Ms =currenttime.millisecond; (Variables available in Chinese)
DateTime.Now.ToString ()///Get the current system time complete date and time
DateTime.Now.ToLongDateString ()///Only display date xxxx xx month xx, one is a long date
DateTime.Now.ToShortDateString ()//Only show date Xxxx-xx-xx one is a short date
DateTime.Now.Date.ToShortDateString ()//Today
DateTime.Now.AddDays (-1). ToShortDateString ()//yesterday
DateTime.Now.AddDays (1). ToShortDateString ()/Tomorrow
Chinese date/month Day time string stry=currenttime.tostring ("F"); Do not show seconds
Chinese date-month string strym=currenttime.tostring ("Y");
Chinese date Month day string strmd=currenttime.tostring ("M");
The current year date format is: 2003-9-23 string strymd=currenttime.tostring ("D");
The current time division format is: 14:24 string strt=currenttime.tostring ("T");
More format see attached 1, 2.
This week (note that every week here starts from Sunday to Saturday)
DateTime.Now.AddDays (Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek))). ToShortDateString ();
DateTime.Now.AddDays (Convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek))). ToShortDateString ();
Last week (last week is minus 7 days this week)
DateTime.Now.AddDays (Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek))-7). ToShortDateString ();
DateTime.Now.AddDays (Convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek))-7). ToShortDateString ();
Next week (plus 7 days this week)
DateTime.Now.AddDays (Convert.todouble (0-convert.toint16 (DateTime.Now.DayOfWeek)) + 7). ToShortDateString ();
DateTime.Now.AddDays (Convert.todouble (6-convert.toint16 (DateTime.Now.DayOfWeek)) + 7). ToShortDateString ();
This month (the first day of this month is number 1th, the last day is the next month, one and a minus another day)
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
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Attached 1:datetime type in ToString (), format formatting
| Format characters |
Association Properties/Description |
| D |
ShortDatePattern |
| D |
Longdatepattern |
| F |
Full date and time (long date and short time) |
| F |
Fulldatetimepattern (long date and long time) |
| G |
General (short date and short time) |
| G |
General (short date and long time) |
| Mm |
Monthdaypattern |
| R, R |
Rfc1123pattern |
| S |
Sortabledatetimepattern using local time (based on ISO 8601) |
| T |
Shorttimepattern |
| T |
Longtimepattern |
| U |
Universalsortabledatetimepattern the format used to display Universal Time |
| U |
Full date and time to use universal Time (long date and long time) |
| Y, y |
Y, y Yearmonthpattern |
Appendix 2: The following table lists the patterns that can be merged to construct custom schemas. These patterns are case-sensitive
| Format characters |
Association Properties/Description |
| D |
One day of the month. The date of one number does not have a leading zero. |
| Dd |
One day of the month. The date of a single number has a leading zero. |
| Ddd |
The abbreviated name of the day of the week, defined in Abbreviateddaynames. |
| dddd |
The full name of the day of the week, defined in DayNames. |
| M |
The number of months. A single number of months does not have a leading zero. |
| Mm |
The number of months. A one-digit month has a leading zero. |
| MMM |
The abbreviated name of the month, defined in AbbreviatedMonthNames. |
| MMMM |
The full name of the month, defined in MonthNames. |
| Y |
The year that does not contain eras. If the year that does not contain the era is less than 10, the year is displayed with no leading zeros. |
| Yy |
The year that does not contain eras. If the year that does not contain the era is less than 10, the year with leading zeros is displayed. |
| yyyy |
A four-digit year that includes the era. |
| Gg |
Period or era. If the date to be formatted does not have an associated period or era string, the pattern is ignored. |
| H |
12-hour hours. The number of hours in a single digit does not have a leading zero. |
| hh |
12-hour hours. The number of hours in a single digit has a leading zero. |
| H |
24-hour hours. The number of hours in a single digit does not have a leading zero. |
| HH |
24-hour hours. The number of hours in a single digit has a leading zero. |
