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What is the correct regex for a 24 hour clock with alphabet support (java)


By : user6096212
Date : September 15 2020, 07:00 PM
I wish this helpful for you ANSWER: (?:[01a][\\db]|2[0-9b]):[0-9c][\\dd]
The regex was suppose to allow a string (s) to validate to true if the length was 5 and the third character is a colon, and false otherwise.
code :
@Test
  public void test09_hasValidLengthAndSeparator() {
    final String[] VALID = {"01:30", "ab:cd", "29:99"};
    for (int i = 0; i < VALID.length; i++) {
      String s = VALID[i];
      String error = 
          String.format("regextest.hasValidLengthAndSeparator(s) returned false for s = %s", s);
      assertTrue(error, lab0.hasValidLengthAndSeparator(s));
    }
    final String[] NOT_VALID = {"", "1:30", "01,23", "29:9"};
    for (int i = 0; i < NOT_VALID.length; i++) {
      String s = NOT_VALID[i];
      String error = 
          String.format("regextest.hasValidLengthAndSeparator(s) returned true for s = %s", s);
      assertFalse(error, regextest.hasValidLengthAndSeparator(s));
    }
  }


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Please help me to build fast/optimized t-sql for converting 12 hour clock to 24 hour clock


By : user3185766
Date : March 29 2020, 07:55 AM
With these it helps You cannot use Time data type if you want to support MS SQL 2005. My solution uses some conversions:
code :
-- test data:
SELECT '07:30' AS Time, 'AM' AS AMPM
INTO testTime
UNION ALL 
SELECT '08:45' AS Time, 'PM'
UNION ALL 
SELECT '12:00' AS Time, 'PM'
UNION ALL 
SELECT '01:00' AS Time, 'PM'
UNION ALL 
SELECT '12:00' AS Time, 'AM'
UNION ALL 
SELECT '07:15' AS Time, 'AM'

-- Final query
SELECT TIME, AMPM , 
       CASE WHEN AMPM = 'PM' THEN 
         CAST( CAST(LEFT(Time, 2) AS int) + 12 AS varchar)+substring(Time, 3, 3) 
       ELSE 
         Time 
       END
FROM testTime

Converting 24 hour clock to 12 hour java


By : Weekiat Ang
Date : March 29 2020, 07:55 AM
I hope this helps . A 24 Hour clock, H, runs from 0<=H<=23. If H div 12 is 0, then AM, else PM. Then the 12 Hour clock, h, is H mod 12 unless that value is 0, in which case h = 12. You shouldn't be changing the value (hours.setValue(...)) in your display code, nor do you need to convert to seconds. I think the issue with your code is just a syntax problem in the first conditional statement.
code :
... if(hours.getValue() == 1 < hours.getValue() ... // This is wrong
// Not correct Java!
string meridianNess = (hours.getValue()/12==0?"AM":"PM");
int h = hours.getValue()%12;
if (h==0) h = 12;
System.out.print(h+":"+new NumberFormat("00").format(minutes.getValue())+":"+
    new NumberFormat("00").format(seconds.getValue())+" "+meridianNess);

Time Conversion from 12-hour to 24-hour clock in Java


By : Christian
Date : March 29 2020, 07:55 AM
Any of those help You have to use SimpleDateFormat to any kind of date-time conversion.
You can try this:
code :
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateConversion {
   public void convertDate() {
      try{
       SimpleDateFormat df = new SimpleDateFormat("HH:mm");
       SimpleDateFormat pf = new SimpleDateFormat("MM/dd/yyyy hh:mm a");
       Date date = pf.parse("10:20PM");
       System.out.println(pf.format(date) + " = " + df.format(date));
        }catch(Exception e){
        // Do your exception handling over here.
        }
   }
}

Pyspark: Convert String Datetime in 12 hour Clock to Date time with 24 hour clock (Time Zone Change)


By : Nat
Date : March 29 2020, 07:55 AM
will be helpful for those in need Edit: Apologies, the sample data frame is a little off. Below is the corrected sample dataframe I'm trying to convert: , Firstly, import from_unixtime, unix_timestamp and col using
code :
from pyspark.sql.functions import from_unixtime, unix_timestamp, col
>>> cols = ['Timestamp (CST)']
>>> vals = [
...         ('2018-11-21T5:28:56 PM',),
...         ('2018-11-21T5:29:16 PM',)]
>>> df_time = spark.createDataFrame(vals, cols)
>>> df_time.show(2, False)
+---------------------+
|Timestamp (CST)      |
+---------------------+
|2018-11-21T5:28:56 PM|
|2018-11-21T5:29:16 PM|
+---------------------+
>>> df_time_twenfour = df_time.withColumn('Timestamp (CST)', \
...             from_unixtime(unix_timestamp(col(('Timestamp (CST)')), "yyyy-MM-dd'T'hh:mm:ss aa"), "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"))
>>> df_time_twenfour.show(2, False)
+------------------------+
|Timestamp (CST)         |
+------------------------+
|2018-11-21T17:28:56.000Z|
|2018-11-21T17:29:16.000Z|
+------------------------+

24 hour clock to 12 hour clock conversion - curly brace pairing issue


By : sanjay
Date : March 29 2020, 07:55 AM
around this issue The real problem is that you didn't indent your code properly. Once you do that, it will be a lot easier for you to detect the problems by yourself.
A few bugs I found from just quickly looking at your code:
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