Nipun Batra Nipun Batra - 1 month ago 22
Python Question

Pandas: Using Unix epoch timestamp as Datetime index

My application involves dealing with data (contained in a CSV) which is of the following form:

Epoch (number of seconds since Jan 1, 1970), Value
1368431149,20.3
1368431150,21.4
..


Currently i read the CSV using numpy loadtxt method (can easily use read_csv from Pandas). Currently for my series i am converting the timestamps field as follows:

timestamp_date=[datetime.datetime.fromtimestamp(timestamp_column[i]) for i in range(len(timestamp_column))]


I follow this by setting timestamp_date as the Datetime index for my DataFrame. I tried searching at several places to see if there is a quicker (inbuilt) way of using these Unix epoch timestamps, but could not find any. A lot of applications make use of such timestamp terminology.


  1. Is there an inbuilt method for handling such timestamp formats?

  2. If not, what is the recommended way of handling these formats?


Answer

Convert them to datetime64[s]:

np.array([1368431149, 1368431150]).astype('datetime64[s]')
# array([2013-05-13 07:45:49, 2013-05-13 07:45:50], dtype=datetime64[s])
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