Based on Input box: (initiate on focus)

With different format:

Based on anchor: calendar

format() format
Enter a format string, then click the format link. The current date will be displayed in that format.

  Format Tokens:    
      d     - day of month (not padded)       h     - hour, 12 hour clock (not padded)
      dd    - day of month (zero padded)      hh    - hour, 12 hour clock (zero padded)
      ddd   - day name, abbreviated           H     - hour, 24 hour clock (not padded)
      dddd  - day name, full                  HH    - hour, 24 hour clock (zero padded)
      m     - month number (not padded)       i     - minutes (not padded)
      mm    - month number (zero padded)      ii    - minutes (zero padded)
      mmm   - month name, abbreviated         s     - seconds (not padded)
      mmmm  - month name, full                ss    - seconds (zero padded)
      y     - two digit year (not padded)     a     - am / pm (lowercase)
      yy    - two digit year (zero padded)    A     - AM / PM (uppercase)
      yyyy  - four digit year                 O     - timze zone offset from GMT.  (that is a letter OH, not number zero)
      j     - ordinal day/julian date
      jjj   - ordinal day/julian date (same as "j")
      
    prebuilt formats
      short       - "m/d/yy"              
      medium      - "mmm d yyyy"          
      long        - "mmmm d yyyy"         
      shorttime   - "m/d/yy HH:ii"        
      mediumtime  - "mmm d yyyy HH:ii"    
      longtime    - "mmmm d yyyy hh:ii:ss A O"
      iso8610     - "yyyy-mm-ddTHH:ii:ss O"
      yyyymmdd    - "yyyy-mm-dd"
  

isDate() check
Enter something in the text box. Click the check link to see if it's a date or not.
This simple routine is checking a list of known formats. The isDate() method can take a formatstring parameter to explicitly check an arbitrary format.

parseDate() parse
Enter a date in the text box. Then click the parse link to see if the date object can be found.
This simple routine is checking a list of known formats. The parseDate() method can take a formatstring parameter to explicitly parse an arbitrary format.

dateAdd() ms - millisecondss - secondsi - minutes h - hoursd - daysw - weeks y - year show me
Select a unit from the list. Enter a qantity. Click the show me button to see the resulting date (using the current date as the starting point).

dateDiff() ms - millisecondss - secondsi - minutes h - hoursd - daysw - weeks y - year show me
Select a unit from the list. Enter two dates. Click the show me button to see the difference between the dates in the selected unit.