how to match two time series in r code example

Example: how to match two time series in r

# df.CB starts at 2019-01-01 00:00:00 and ends at 2020-05-19 00:00:00
# df.raw starts at 2018-01-01 00:00:00 and ends at 2020-05-19 00:00:00

TimeMin = which(df.raw$Time == min(df.CB$Time))
TimeMax = which(df.raw$Time == max(df.CB$Time))
df.raw = df.raw[TimeMin:TimeMax, ]