Character string in the specified format.

• Duration variable containing the duration in "+DHHMMSSLLL" format (D corresponds to the number of days, HH to the hours, MM to the minutes, SS to the seconds and LLL to the milliseconds).
• Versions 23 and later
  Direct indication of duration (1 d 2 h 3 min 10 s 10 ms for example, where d corresponds to the number of days, h to the hours, min to the minutes, s to the seconds and ms to the milliseconds).
  New in version 23
  Direct indication of duration (1 d 2 h 3 min 10 s 10 ms for example, where d corresponds to the number of days, h to the hours, min to the minutes, s to the seconds and ms to the milliseconds).
  Direct indication of duration (1 d 2 h 3 min 10 s 10 ms for example, where d corresponds to the number of days, h to the hours, min to the minutes, s to the seconds and ms to the milliseconds).

The Duration type does not exist in PHP. Therefore, this parameter must necessarily be a character string.

Format to apply to the duration. This parameter can correspond to:

• a character string (a sentence for example). The specific characters representing the different elements of the duration (D, HH, MM, SS or LLL) will be automatically replaced by their value identified in the <Duration> string. Here are the characters used in this string:
  • + is used to take the negative numbers into account,
  • D represents the number of days,
  • HH represent the number of hours,
  • MM represent the number of minutes,
  • SS represent the number of seconds,
  • LLL represent the number of milliseconds.
• one of the following constants:
  

  durationMilli	Format used: "+DHHMMSSLLL"
  durationCenti	Format used: "+DHHMMSSLL". This format allows you to retrieve the result in the format used by DateTimeDifference