iOS time format conversion

<span id="Label3"></p><p><p>When developing iOS programs, it is sometimes necessary to adjust the time format to the format you want, which we can do with the NSDateFormatter class.</p></p><p><p>For example: How to convert the time format "12-may-14 05.08.02.000000 PM" to "2014/05/12 5:08:02", The following is the specific implementation code:</p></p><p><p>nsstring* timestr = @ "12-may-14 05.08.02.000000 PM";</p></p><p><p>NSDateFormatter *formatter = [[nsdateformatter alloc] init];</p></p><p><p>[formatter setdatestyle:nsdateformattermediumstyle];</p></p><p><p>[formatter settimestyle:nsdateformattershortstyle];</p></p><p><p>[formatter setdateformat:@ "dd-mmmm-yy hh.mm.ss.ssssss aa"];//set The format of the source time string</p></p><p><p>nstimezone* TimeZone = [nstimezone timezonewithname:@ "asia/shanghai"];//set time zone</p></p><p><p>[formatter settimezone:timezone];</p></p><p><p>nsdate* date = [formatter datefromstring:timestr];//converts The source time string to NSDate</p></p><p><p>nsdateformatter* toformatter = [[nsdateformatter alloc] init];</p></p><p><p>[toformatter setdatestyle:nsdateformattermediumstyle];</p></p><p><p>[toformatter settimestyle:nsdateformattershortstyle];</p></p><p><p>[toformatter setdateformat:@ "YYYY/MM/DD h:mm:ss"];//set The format of the target time string</p></p><p><p>NSString *targettime = [toformatter stringfromdate:date];//convert time to target time string</p></p><p><p>NSLog (@ "targettime = = =%@", targettime);</p></p><p><p></p></p><p><p>In fact, the conversion between time formats is entirely dependent on nsdateformatter.</p></p><p><p>NSDateFormatter has the following 2 methods:<br>-(nsstring *) stringfromdate: (nsdate *) date;//nsdate turn NSString<br>-(nsdate *) datefromstring: (nsstring *) string;//nsstring turn NSDate<br></p></p><p><p></p></p>