• Date and time in Epoch format (number of time units since 01/01/1970 at 00h00 UTC).
• -1 if an error occurred (invalid date and time).

Local date and time to convert. Can correspond to:

• a DateTime variable.
• a character string with one of the following formats:
  • YYYYMMDDHHMMSSLLL
  • YYYYMMDDHHMMSSCC
  • YYYYMMDDHHMMSS
  • YYYYMMDDHHMM
  • YYYYMMDDHH
  • YYYYMMDD

This parameter will be considered as being invalid in the following cases:

• if the date is invalid or if it is earlier than 01/01/1970. The date validity can be checked by DateValid.
• if the time is invalid. The time validity can be checked by TimeValid.

Note: You have the ability to use dates beyond year 2038.

Options for converting the date and time to Epoch format:

epochUnixMillisecond	The result will be expressed in milliseconds from 01/01/1970 at 00h00 UTC (time 0 in Unix).
epochUnixSecond (default value)	The result will be expressed in seconds from 01/01/1970 at 00h00 UTC (time 0 in Unix).