Handling Date, DateTime and Timezone

Recently I came across this problem in one of my project.
Since this is a commonly used lib so I will just keep it here for future reference.

Based on Java™ Platform Standard Ed. 7
Now to compatible with java.sql.Date, we use constructor Date(long date) which takes a milliseconds time value. (milliseconds since January 1, 1970, 00:00:00 GMT not to exceed the milliseconds representation for the year 8099). The other constructor Date(int year, int month, int day) is deprecated.

Create a new Date with current time

Date date = new Date(System.currentTimeMillis());

Get formatted Date object

TimeZone tz = TimeZone.getTimeZone("UTC");
DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
format.setTimeZone(tz);
return format.parse(dateString);

 

 

Letter Date or Time Component Presentation Examples
G Era designator Text AD
y Year Year 1996; 96
Y Week year Year 2009; 09
M Month in year Month July; Jul; 07
w Week in year Number 27
W Week in month Number 2
D Day in year Number 189
d Day in month Number 10
F Day of week in month Number 2
E Day name in week Text Tuesday; Tue
u Day number of week (1 = Monday, …, 7 = Sunday) Number 1
a Am/pm marker Text PM
H Hour in day (0-23) Number 0
k Hour in day (1-24) Number 24
K Hour in am/pm (0-11) Number 0
h Hour in am/pm (1-12) Number 12
m Minute in hour Number 30
s Second in minute Number 55
S Millisecond Number 978
z Time zone General time zone Pacific Standard Time; PST; GMT-08:00
Z Time zone RFC 822 time zone -0800
X Time zone ISO 8601 time zone -08; -0800; -08:00

 

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