The number of seconds since midnight can be computed by multiplying the decimal fraction of DATE by 86400 seconds. You can compute differences in date and time by subtracting the numbers returned by DATE. TDCREATE and TDUPDATE have the same format as DATE, but their values represent the creation time and last update time of the current drawing. corresponds to 2450634.60387736, and 1 January 1998 at 12:00 noon corresponds to 2450815.50000000.īecause the system clock provides the current date and time, the DATE system variable returns a true Julian date only if the system clock is set to UTC/Zulu (Greenwich Mean Time).

When change occurs to block add block vla-object to a list of changed blocks. Make sure you create a boolean flag to prevent the object reactor from triggering when the command reactor changes the object. The Modified Julian Date, conventionally called UT1, is a worldwide scientific standard that assigns day numbers beginning at an essentially arbitrary date and time of 12:00 a.m. The object modified reactor would set a flag to trigger the command ended reactor to make the change. The Modified Julian Date (MJD) format is a Julian day number with decimal fraction of a day.

Autocad lisp last modified date