Inconsistent and Incomprehensible Returned Time Stamp

I downloaded all the trades for OBAS on 2/23:

https://data.alpaca.markets/v2/stocks/trades?limit=10000&symbols=OBAS&start=2022-02-23T06:00:00Z&end=2022-02-24T03:00:00Z

Results are below at the end. The timestamps mostly have nano-sec precision. But one trade [3] has a timestamp “2022-02-23T14:30:28.192453Z”, while another [6] has “2022-02-23T20:01:35.776Z”. Am I supposed to pad zeros at the end, or are such timestamps to be interpreted in some other way?

\ {
next_page_token undef,
trades {
OBAS [
[0] {
c [
[0] “@”,
[1] “T”,
[2] “I”
],
i 1,
p 12.23,
s 10,
t “2022-02-23T13:24:09.308477696Z”,
x “P”,
z “C”
},
[1] {
c [
[0] “@”,
[1] “O”,
[2] “I”
],
i 1,
p 12.35,
s 1,
t “2022-02-23T14:30:00.890190506Z”,
x “Q”,
z “C”
},
[2] {
c [
[0] “@”,
[1] “Q”
],
i 2,
p 12.35,
s 1,
t “2022-02-23T14:30:00.890203908Z”,
x “Q”,
z “C”
},
[3] {
c [
[0] “@”,
[1] “I”
],
i 1,
p 12.21,
s 44,
t “2022-02-23T14:30:28.192453Z”,
x “D”,
z “C”
},
[4] {
c [
[0] “@”,
[1] “F”,
[2] “I”
],
i 2,
p 12.5,
s 1,
t “2022-02-23T15:46:37.352037632Z”,
x “P”,
z “C”
},
[5] {
c [
[0] “@”,
[1] “Q”
],
i 3,
p 12.5,
s 1,
t “2022-02-23T15:46:37.352037632Z”,
x “P”,
z “C”
},
[6] {
c [
[0] “@”,
[1] “I”
],
i 1,
p 12.4339,
s 6,
t “2022-02-23T20:01:35.776Z”,
x “D”,
z “C”
},
[7] {
c [
[0] “@”,
[1] 6,
[2] “I”
],
i 3,
p 12.35,
s 11,
t “2022-02-23T21:00:00.811324435Z”,
x “Q”,
z “C”
},
[8] {
c [
[0] “@”,
[1] “M”
],
i 4,
p 12.35,
s 11,
t “2022-02-23T21:00:00.811346398Z”,
x “Q”,
z “C”
},
[9] {
c [
[0] “@”,
[1] “F”,
[2] “T”
],
i 1,
p 12.35,
s 990,
t “2022-02-23T21:02:52.782672Z”,
x “J”,
z “C”
}
]
}
}