C # String, time, math type

C # in the same as JS in the basic;

Datetime Da=datetime.now; --Get the current time

DateTime da=new datetime (2000,10,10)--Create a new time

Da,tostring ("yyyy MM DD Day")--Set date format yyyy-mm-month dd-Day hh-12 system hour HH-24 system hour mm-minutes ss-seconds ms-milliseconds

Str.toupper && Str.tolower--casing conversion. Unlike JS, there is no case at the back.

Str.trim ();  Str.trimstart ();　　     Str.trimend (); --Remove the space, go to the front space, go after the space

Str.contains ("a")--judging whether it is contained, type Boolean, bool

Str. Startwidth ("a") str. Endswidth ("a")--judging with what the beginning end usage is the same as contains

Str.replace ("A", "B")--replace the string in the

Math.pow (x, y)--data type double type

------------------------------------------------------------

DateTime TT = new DateTime (2000, 10, 10);
DateTime t = DateTime.Now;
TimeSpan m =tt-t;
int b = m.days;
The use of timespan, the difference in how many days

-----------------------------------------------------------

. AddYears (); -How many years are added on this time basis
. AddMonths (); -Increase Month
. AddDays (); -Increase Day
. AddHours (); -Increase hours
. AddMinutes (); -Add minutes
. AddSeconds (); -Add seconds

. year; -Gets the year of this time variable
. Month; -Get Month
. Day; -Day
. Hour; -Hour
. Minute; -Minute
. Second; -Seconds
. millisecond; -Milliseconds

. DayOfYear; -Gets the current date is the day ordinal of the year
. DayOfWeek; -Get the day of the week

. TimeOfDay; -Get Time section
. Date; -Get Date part

TimeSpan type-time interval type
. Days-the difference in how many day
. Hours-How many hours the gap is in a day
. Minutes-How many minutes the gap in a day
. Seconds-How many seconds difference in a day
. Milliseconds-MS

. Total .... Cumulative gap

C # String, time, math type