${CDR(start)} is the only variable through which I can get the call start time in dialplan?
There’s probably more (and maybe better) but what about {EPOCH} or even the integer portion of {UNIQUEID}? Also take a look at the CHANNEL() function, there may be something there.
Note that EPOCH is the current second so you should grab it early 
UNIQUEID is supposed to be opaque, so you rely on its structure at your own risk. Also, it is not necessarily constant during a call.
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