iOS Standard time and timestamp convert each other

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2. To set the time display format:
4. nsstring* timestr = @ "2011-01-26 17:40:50";
6. NSDateFormatter *formatter = [[[[NSDateFormatter alloc] init] autorelease];
8. [Formatter Setdatestyle:nsdateformattermediumstyle];
10. [Formatter Settimestyle:nsdateformattershortstyle];
12. [Formatter setdateformat:@ "Yyyy-mm-dd HH:mm:ss"]; ----------set the format you want, the difference between HH and HH: 12-hour, 24-hour system, respectively.
16. Setting the time zone, which is sometimes important
18. For example, you publish information in the country, the user in another time zone abroad, you want to let users see the correct release time to pay attention to time zone settings, time conversion.
20. For example, if you posted a time of 2010-01-26 17:40:50, how much time should the user see in the UK and Ireland?
22. They have a 7-hour time difference with us, so they're not there yet. That's what's going to happen in the future.
26. nstimezone* TimeZone = [Nstimezone timezonewithname:@ "Asia/shanghai"];
28. [Formatter Settimezone:timezone];
32. nsdate* date = [Formatter datefromstring:timestr]; ------------turn the string into NSDate by formatter
36. NSDate *datenow = [NSDate date];//now time, you can output to see what format
40. NSString *nowtimestr = [Formatter stringfromdate:datenow];//----------convert NSDate to formatter by NSString format
42. Time-to-timestamp method:
44. NSString *timesp = [NSString stringwithformat:@ "%d", (long) [Datenow timeIntervalSince1970]];
46. NSLog (@ "timesp:%@", TIMESP); Value of time stamp
48. The method of time stamp turn time
50. NSDate *CONFROMTIMESP = [NSDate datewithtimeintervalsince1970:1296035591];
52. NSLog (@ "1296035591 =%@", CONFROMTIMESP);
54. NSString *confromtimespstr = [Formatter stringfromdate:confromtimesp];
56. NSLog (@ "confromtimespstr =%@", confromtimespstr);
58. Time-Stamping Method:
60. nsdateformatter* formatter = [[NSDateFormatter alloc] init];
62. [Formatter Setdatestyle:nsdateformattermediumstyle];
64. [Formatter Settimestyle:nsdateformattershortstyle];
66. [Formatter setdateformat:@ "YYYYMMDDHHMMSS"];
68. NSDate *date = [Formatter datefromstring:@ "1283376197"];
70. NSLog (@ "date1:%@", date);
72. [Formatter release];

   set time display format:     nsstring* timestr = @ "2011-01-26 17:40:50";     NSDateFormatter *formatter = [[[[NSDateFormatter alloc] init] Autorelease];    [formatter Setdatestyle:nsdateformattermediumstyle];    [formatter SetTimeStyle: Nsdateformattershortstyle];       [formatter setdateformat:@ "Yyyy-mm-dd HH:mm:ss"]; ----------set the format you want, the difference between HH and HH: 12-hour, 24-hour        //set time zone, this is sometimes important for time processing     //For example, you publish information in the country, the user in another time zone abroad, you want to let the user see the correct release time to pay attention to time zone settings, time conversion.     // For example, if you publish for 2010-01-26 17:40:50, how much time should the user see in the UK and Ireland?     //they have a 7-hour time difference with us, so they're not there yet. That's what's going to happen in the future.        nstimezone* TimeZone = [Nstimezone timezonewithname:@ "Asia/ Shanghai "];    [formatter settimezone:timezone];        nsdate* date = [Formatter DatefroMSTRING:TIMESTR]; ------------turn the string into nsdate             by formatter    nsdate *datenow = [NSDate date];//now time, you can output to see what the format is         NSString *nowtimestr = [Formatter stringfromdate:datenow];//----------to convert nsdate in formatter format to nsstring time to time stamp method:     nsstring *TIMESP = [NSString stringwithformat:@ "%d", (long) [Datenow timeIntervalSince1970]];     nslog (@ "timesp:%@", TIMESP); The timestamp value   method of time stamp     nsdate *confromtimesp = [NSDate dateWithTimeIntervalSince1970 : 1296035591];    nslog (@ "1296035591  =%@", CONFROMTIMESP);          nsstring *confromtimespstr = [Formatter stringFromDate: Confromtimesp];    nslog (@ "confromtimespstr =  %@", Confromtimespstr), method of time-stamp transfer:

nsdateformatter* formatter = [[NSDateFormatter alloc] init];
[Formatter Setdatestyle:nsdateformattermediumstyle];
[Formatter Settimestyle:nsdateformattershortstyle];
[Formatter setdateformat:@ "YYYYMMDDHHMMSS"];
NSDate *date = [Formatter datefromstring:@ "1283376197"];
NSLog (@ "date1:%@", date);
[Formatter release];

iOS Standard time and timestamp convert each other