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SmartPy's type for timestamps is sp.timestamp.
sp.timestamp
sp.timestamp(n) refers to the moment in time n seconds since the Epoch. For example, sp.timestamp(1571659294) represents 2019-10-21T12:01:34Z.
sp.timestamp(n)
n
sp.timestamp(1571659294)
2019-10-21T12:01:34Z
Adds secs seconds to t.
secs
t