如何连接不同列和绘图时间序列中的时间值

I am new to R and I want to know how to write a code for my following question. I have excel file in the following format. 1. I want to create a time series from first 4 column, each and every column represent year, month, date, time(hours) 2. Plot the time series against 2 stations that I have (X991 and X5779) Note: first raw indicate what type of time seris (Temperature), second raw is height of the station, third row is X coordinate, fourth row is Y coordinate and fifth row is station name (X991, X5779), therfore i want to skip these rows and plot my time seriesI am new to R and I want to know how to write a