如何在R的數據框中創建一個日期/時間列？

Question

數據幀我一起工作：

head(ossub3) 

date---------|os5 | os6 | os7| os8 | _ _Year| Month|Day|Hour|Minutes 
11/15/2015|10.06|16.94|10.63|12.94 |2015|11|15| 12|08 

我都分隔成列的時間單位。我想在R.我曾嘗試在R tick data : merging date and time into a single object和Strip the date and keep the time的解決方案，一個datetime列，因爲當我嘗試

#Combine Date 

ossub3$Date<-as.POSIXlt(paste(ossub3$Year, ossub3$Month, ossub3$Day, sep="-"), 
    tz = "US/Central", format = "%Y-%m-%d") 

#Create new column called Time which concatenates Hour, Minute as a POSIXlt 

ossub3$sec=rep(00,nrow(ossub3)) 
ossub3$Time<-as.POSIXlt(paste(ossub3$Hour, ossub3$Minute,ossub3$sec, sep=":"), 
    tz = "US/Central", format = "%H:%M") 

我得到今天的日期在我的時間，所以我不能與日期結合起來。這裏發生了什麼？

Answer 1

一個需要最後一步：

ossub3$sec=rep(00,nrow(ossub3)) 
ossub3$Time<-as.POSIXlt(paste(ossub3$Hour, ossub3$Minute,ossub3$sec, sep=":"), tz = "US/Central", format = "%H:%M") 

# Excluding the date information and preserving just the time 
ossub3$JustTime <- sapply(ossub3$Time, function(x) {format(x, format = "%T")}) 

通過這樣做，你要刪除的日期信息（這是在你的情況下，當前的日期和無意義的），你可以只是時間附加到您在另一列中的日期（ossub3$Date）。