[英]Pandas- Change default datetime to another time
I have a dataframe which has two datetime
columns.我有一个数据框,它有两个
datetime
时间列。 I am doing difference of those two datetime
columns to find number of days between them.我正在对这两个
datetime
时间列进行差异以查找它们之间的天数。 The problem is the time in both of them starts from 06:00:00
so when the actual day gets over, the difference remains the same.问题是它们的时间都是从
06:00:00
开始的,所以当实际一天结束时,差异保持不变。
Here is the dataframe这是数据框
machineID datetime_tel comp1 datetime_maint sincelastComp1
30 2021-01-01 23:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 00:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 01:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 02:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 03:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 04:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 05:00:00 1 2020-07-31 06:00:00 154
30 2021-01-02 06:00:00 1 2020-07-31 06:00:00 155
30 2021-01-02 07:00:00 1 2020-07-31 06:00:00 155
Here you can see when we have date as 2021-01-02
and time as 00:00:00
, there is no increment in sincelastComp1
(ideally it should have been incremented as date as increased by 1).在这里你可以看到当我们的日期为
2021-01-02
和时间为00:00:00
时, sincelastComp1
没有增量(理想情况下,它应该随着日期的增加而增加 1)。 It is only increasing when time is 06:00:00
.它仅在时间为
06:00:00
时增加。
I want the increment to happen when the date changes.我希望在日期更改时发生增量。
if I understand you right, you want to calculate the difference between dates and not between timestamps:如果我理解正确,您想计算日期之间的差异,而不是时间戳之间的差异:
df['sincelastComp1'] = (df['datetime_tel'].apply(pd.Timestamp).dt.date -
df['datetime_maint'].apply(pd.Timestamp).dt.date).dt.days
output:输出:
machineID datetime_tel comp1 datetime_maint sincelastComp1
0 30 2021-01-01 23:00:00 1 2020-07-31 06:00:00 154
1 30 2021-01-02 00:00:00 1 2020-07-31 06:00:00 155
2 30 2021-01-02 01:00:00 1 2020-07-31 06:00:00 155
3 30 2021-01-02 02:00:00 1 2020-07-31 06:00:00 155
4 30 2021-01-02 03:00:00 1 2020-07-31 06:00:00 155
5 30 2021-01-02 04:00:00 1 2020-07-31 06:00:00 155
6 30 2021-01-02 05:00:00 1 2020-07-31 06:00:00 155
7 30 2021-01-02 06:00:00 1 2020-07-31 06:00:00 155
8 30 2021-01-02 07:00:00 1 2020-07-31 06:00:00 155
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