r - extracting hour minute from non-delimited data -

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i have instrument data contains hours , minutes in non-delimited format (e.g., 0, 30, 100, 130, ... 2300, 2300). convert column posix object in r (e.g., looks "2016-01-07 11:07:59 est") , first step extract out hour , minute data column. (i have corresponding julian date , year columns.)

i getting tripped because hour , minutes not delimited , have been unable use strptime function. have searched using both google , (using r , datatime tags on so), have been unable find solution. of examples find on (e.g., here or here) have hour , minute separated such 0:30.

here mcve:

hour <- c(0, 30, 100, 130, 1000, 1030, 2300, 2330) year <- c(2007, 2007, 2007, 2007, 2007, 2007, 2007, 2007) day  <- c(2, 2, 2, 2, 2, 2, 2, 2) strptime(hour, "%h%m")

so, how extract out hour , minute when have non-delimited data?

you can use sprintf add leading 0s hours have less 4 digits:

strptime(sprintf("%04d", hour), "%h%m")

you can convert date:

as.posixct(paste(year,day,sprintf("%04d", hour),sep="-"),format = '%y-%j-%h%m')

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