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int_end(int)
int_start
int_shift
int_flip
int_length
int <- new_interval(ymd("2001-01-01"), ymd("2002-01-01")) # 2001-01-01 UTC--2002-01-01 UTC int_end(int) # "2002-01-01 UTC" int_end(int) <- ymd("2002-06-01") int # 2001-01-01 UTC--2002-06-01 UTC
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