AM/PM Distinction when formatting datetime field from sqlite into datetime field in R -

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i have pulled data sqlite table r. 1 of columns string, datatime in sqlite. in following format: 

                  time_json         number 1    2013-07-08 01:06:02              6 2    2013-07-08 01:08:01              6 3    2013-07-08 01:12:01              6 4    2013-07-08 01:14:01              6 5    2013-07-08 01:16:01              6

i need format time_json field proper date time in r, , account am/pm distinction. nothing i've tried works.

thanks kindly.

this seems work, using formats listed in ?strptime:

test <- c("2013-07-08 01:06:02 am", "2013-07-08 01:06:02 pm")  as.posixct(   test,   format="%y-%m-%d %i:%m:%s %p" )

result:

[1] "2013-07-08 01:06:02 est" "2013-07-08 13:06:02 est"

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