Objective-c conversion and time of timestamp conversions

What is a timestamp?

time Stamp ( timestamp ), which is typically a sequence of characters. Uniquely identifies a moment in time. Digital Timestamp technology is A variant application of digital signature technology.

thinking: Simply speaking is based on the file hash encryption generated by the digest and time generated time certificate, its value is from 1970 years 1 Month 1 Day 8 The total number of milliseconds to point to today's time

in Objective - C How do I convert timestamps to nsdate?

Nsstring*[email protected] "1283376197";

Nstimeintervaltime=[str Doublevalue];

Nsdate*detaildate=[nsdate Datewithtimeintervalsince1970:time];

NSLog (@ "date:%@", [detaildatedescription]);

think: Use this function. The double value of the time stamp is passed to get the nsdate time .

How do I convert the current time to a timestamp?

nsdate *datenow =[nsdate Date]; // Today's Time , you can output to see what the format is

Nstimezone *zone = [nstimezone systemtimezone];

nsinteger interval = [zone secondsfromgmtfordate:d Atenow];

nsdate *localedate = [Datenow datebyaddingtimeinterval: interval];

NSString *TIMESP = [nsstring stringwithformat: @ "%d", (long) [Localedate timeIntervalSince1970]];

NSLog (@ "timesp:%@", TIMESP); // value of time stamp

think: The interval of the standard time based on the current time and the system's time zone, and then the time after validation lo caledate , and finally [localedate timeIntervalSince1970] get the time after the validation and 1970 the difference between the years and the time stamp

How to format output nsdate?

Nsdateformatter*formatter = [[NSDateFormatter alloc]init];

[formattersetdateformat:@ "yyyy mm month DD Day"];

NSDate *date =[formatter Stringfromdate:detaildate];

NSLog (@ "date:%@", date);

think: Create a NSDateFormatter class, and then pass a nsdate on it.

"Yyyymmddhhmmss" represents the seconds of the month and day

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Objective-c conversion and time of timestamp conversions