Monday, August 22, 2016

Android - Formatting Date and Time.



Date and Time formatting Cheat Sheet

SymbolMeaningType Type
GEraText GG->AD
YYearNumber yy -> 03, yyyy -> 2003
MMonthText or Number M -> 7, MM -> 07, MMM -> Jul , MMMM -> July                 
dDay in monthNumber d -> 3 , dd -> 03
hHour (1-12, AM/PM)Number h -> 3 , hh -> 03
HHour (0-23)Number H -> 15 , HH -> 15
kHour (1-24)Number k -> 3 , kk -> 03
KHour (0-11 AM/PM) Number K -> 15 , KK -> 15
mMinuteNumber m -> 7 , m -> 15 , mm -> 15
sSecondNumber s -> 15 , ss -> 15
SMillisecond (0-999)Number SSS -> 007
EDay in weekText EEE -> Tue , EEEE -> Tuesday
DDay in yr(1-365,1-364)Number D -> 65 , DDD -> 065
FDay of week in month (1-5)|Number F -> 1
wWeek in year (1-53)Number w -> 7   
aAM/PMText a -> AM , aa -> AM
zTime zoneText z -> EST , zzz -> EST , zzzz -> Eastern Standard Time


Some sample of date format


 String DATE_FORMAT_1 = "dd-MMM-yyyy kk:mm";
 String DATE_FORMAT_2 = "yyyy-MM-dd HH:mm:ss";
 String DATE_FORMAT_3 = "yyyy-MM-dd";
 String DATE_FORMAT_4 = "dd-MMM-yyyy"; 
 String DATE_FORMAT_5 = "dd_MM_yyyy"; 
 String DATE_FORMAT_6 = "yyyy-MM-dd'T'HH:mm:ss"; 
 String DATE_FORMAT_7 = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS'Z'"; 



1. Get today date.


Example - 1
public String getCurrentTimeStr() { return new SimpleDateFormat(DATE_FORMAT_1, Locale.US).format(new Date()) }


2. Compare dates.


Example - 2
public boolean isFutureDate(String originalDate) { boolean isFuture = false; SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_1, Locale.US); Date dateObj; try { dateObj = sdf.parse(originalDate); if (new Date().before(dateObj)) { isFuture = true; } } catch (ParseException e) { } return isFuture }


3. Convert UTC to Local date UTC is the common time standard across the world.


Example - 3
public String convertUtcToLocal(String dateTime) { String do = ""; if(dateTime !=null){ DateFormat originalFormat = new SimpleDateFormat(DATE_FORMAT_2, Locale.US); originalFormat.setTimeZone(TimeZone.getTimeZone("UTC")); DateFormat targetFormat = new SimpleDateFormat(DATE_FORMAT_2, Locale.US); targetFormat.setTimeZone(TimeZone.getDefault()) try { Date date = originalFormat.parse(dateTime); dob = targetFormat.format(date); } catch (ParseException e) { } } return do; }

4. Merge Date and time

private static final String DATE_TIME = "d MMM yyyy HH:mm";


Example - 4
public Date getTrainStartTime(String originalDate, String time) { String mAlertDateTime = originalDate + " " + time; SimpleDateFormat dft = new SimpleDateFormat(DATE_TIME, Locale.getDefault()); try { Date d = dft.parse(mAlertDateTime); return d; } catch (ParseException e) { e.printStackTrace(); } return new Date(); }




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