DDCHF Calculates the difference (with rollover) between the next reading and current reading.

SYNTAX:

DDCHF(Cx, Optional Rollover)
where :
Cx is a conditional variable x

NOTES:

Typically used with a daily detail variable (Hourly, 15 Minute...).  The function will search the for next reading in the current day, next day, and two days forward before giving up. If rollover is omitted, rollover is assumed at the next power of 10.

EXAMPLES:

V67 = DDCHF(C66)