I'am playing with Java Date and can't understand this:
Date myBirth = new Date(1991,01,21);
Log.d("DATE: ", "" + myBirth);
Here I initialized Date object. Why I get this output?
DEBUG/DATE:(31693): Sat Feb 21 00:00:00 EET 3891
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2January is month 0, February is month 1.Nathan Villaescusa– Nathan Villaescusa2012-10-22 22:49:37 +00:00Commented Oct 22, 2012 at 22:49
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1You may wish to avoid writing numeric literals with a leading 0. A leading 0 tells Java to interpret the number as an octal. For numbers less than 8 this makes no difference. However 010 == 8.Dunes– Dunes2012-10-22 22:51:46 +00:00Commented Oct 22, 2012 at 22:51
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1this constructor is deprecated. take a look at stackoverflow.com/questions/7661723/…vfcosta– vfcosta2012-10-22 22:59:55 +00:00Commented Oct 22, 2012 at 22:59
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1Opposite stackoverflow.com/questions/13020507/…Steve Kuo– Steve Kuo2012-10-22 23:28:30 +00:00Commented Oct 22, 2012 at 23:28
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3 Answers
From the Date docs:
- A year y is represented by the integer y - 1900.
- A month is represented by an integer from 0 to 11; 0 is January, 1 is February, and so forth; thus 11 is December.
2 Comments
Paul Tomblin
@AlexKulakovsky, did you read the rest of that document? Specifically the bit that say you pass in the number of years since 1900?
Andrew Clark
Oops, left the year part out of my original answer, updated now.
tl;dr
java.time.LocalDate.of ( 1991 , Month.JANUARY , 21 )
Avoid legacy date-time classes
The original date-time classes in Java (Date, Calendar, etc.) are a terribly flawed, bloody awful, horrible mess. Among their many problems: They use insane number for years and months.
Use java.time
Use only the modern java.time classes built into Java 8+ for your date-time work.
The java.time classes use sane numbering. The year 1991 is 1991. Months are 1-12 for January-December.
For January 21, 1991 use the LocalDate class.
LocalDate ld = LocalDate.of ( 1991 , 1 , 21 ) ;
Or use the Month enum.
LocalDate ld = LocalDate.of ( 1991 , Month.JANUARY , 21 ) ;
Comments
Quoting from the Javadoc of this deprecated constructor of Date:
Parameters:
year - the year **minus 1900**.
month - the month between 0-11.
date - the day of the month between 1-31.
So the output is what you ask, but not what you want.
