我有以下数据示例:
structure(list(name = c("2020-12-02 02_05_24.143926", "2020-12-02 04_05_44.370258",
"2020-12-02 08_06_25.214121", "2020-12-02 10_06_45.697784", "2020-12-02 14_07_25.747003",
"2020-12-02 16_07_46.002571", "2020-12-02 20_08_25.838364", "2020-12-02 22_08_45.705227",
"2020-12-03 02_09_25.384941", "2020-12-03 04_09_44.709639", "2020-12-03 08_10_23.097440",
"2020-12-03 10_10_42.111583", "2020-12-03 14_11_20.193122", "2020-12-03 16_11_39.252692",
"2020-12-03 20_12_17.340138", "2020-12-03 22_12_36.086608", "2020-12-04 02_15_27.387402",
"2020-12-04 04_15_46.375845", "2020-12-04 08_16_24.414194", "2020-12-04 10_16_43.215919",
"2020-12-31 10_06_26.083394", "2020-12-31 10_36_30.720992", "2020-12-31 14_07_03.081910",
"2020-12-31 14_37_07.718933", "2020-12-31 16_07_21.515981", "2020-12-31 16_37_26.054783",
"2020-12-31 20_07_58.646942", "2020-12-31 20_38_03.155509", "2020-12-31 22_08_17.181192",
"2020-12-31 22_38_21.847135", "2021-01-01 02_08_54.245043", "2021-01-01 02_38_58.905204",
"2021-01-01 04_09_13.055522", "2021-01-01 04_39_17.797032", "2021-01-01 08_09_50.080337",
"2021-01-01 08_39_54.646102", "2021-01-01 10_10_08.580802", "2021-01-01 10_40_13.262391",
"2021-01-01 14_10_45.513987", "2021-01-01 14_40_50.152527", "2021-01-01 16_11_03.966316",
"2021-01-01 16_41_08.595758", "2021-01-01 20_11_41.136895", "2021-01-01 20_41_45.807547",
"2021-01-01 22_11_59.897654", "2021-01-01 22_42_04.619130", "2021-01-02 02_12_37.503054",
"2021-01-02 02_42_42.155622", "2021-01-02 04_12_56.127958", "2021-01-02 04_43_00.807846",
"2021-01-02 08_13_33.280704")), row.names = c(NA, -51L), class = c("data.table",
"data.frame")>)
该数据由日期和时间组成(没有必要将其定义为日期和时间).但是，我想将其按匹配的特定日期/值进行划分，例如:1包含2020-12-31之前、2020-12-31和01-01-2021之间以及01-01-2021之后的数据/值的数据表.
谢谢所有人