Date/Time To Seconds

Converts a cluster of signed 32-bit integers assumed to specify the local time in the configured time zone for your computer into a time-zone-independent number of seconds that have elapsed since 12:00 a.m., Friday, January 1, 1904, Universal Time.

date time rec is the date and time to convert. LabVIEW ignores day of week, day of year, and is DST. The other integers can be any value. Thus, you can specify Julian dates by setting the month to January (1) and the day of year to the current day, such as 150 for the 150th day of the year.
second is the number of seconds to convert and can be 0 to 59.
minute is the number of minutes to convert and can be 0 to 59.
hour is the number of hours to convert and can be 0 to 23.
day of month is the day of the month to convert and can be 1 to 31 as output from the function and 1 to 366 as input.
month is the month to convert and can be 1 to 12.
year is the year to convert and can be 1904 to 2040.
day of week is the day of the week to convert and can be 1 to 7, which corresponds to Sunday to Saturday.
day of year is the day of the year to convert and can be 1 to 366.
is DST indicates whether the time is standard (0) or daylight savings time (1).
seconds is a time zone-independent number of seconds that have elapsed since 12:00 a.m., Friday, January 1, 1904, Universal Time. If year and month are out of range, the results are unpredictable.