.at(date) The interpolated value for the specified date.
.actual(date) The actual value for the specified date or the first actual prior to that date.
Example if there is value at 3:00 = 1161.505 and at 4:00 = 1160.573.
tagname.at(daevalue("02-28-19 3:57")) = 1160.620 interpolated value.
tagname.actual(datevalue("02-28-19 3:57")) = 1161.505 that is the last value.
.actual(date) The actual value for the specified date or the first actual prior to that date.
Example if there is value at 3:00 = 1161.505 and at 4:00 = 1160.573.
tagname.at(daevalue("02-28-19 3:57")) = 1160.620 interpolated value.
tagname.actual(datevalue("02-28-19 3:57")) = 1161.505 that is the last value.
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