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Python处理日期方法大全、三十种方法

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发表于 2024-3-22 11:30 |只看该作者 |倒序浏览
|招呼Ta 关注Ta
使用 time 模块展示当前日期和时间  k# C1 l5 k4 [1 F7 a# ]0 K* E# I
import time  g; W% `. H. e* g
from time import gmtime, strftime: o7 D  K% e" X7 ^
# g( }2 K( O& I8 q8 K" g
t = time.localtime()  : n3 d9 k0 f# t( l0 D: G: D
print (time.asctime(t))  # Sun May 7 09:30:37 20176 u  T* o& f! A9 r2 d
print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime()))  # Sun, 07 May 2017 04:00:37 +0000' r$ G+ I+ C* z: I; [
print(strftime("%A", gmtime()))  # Sunday  P, c8 r, ^1 T/ s
print(strftime("%D", gmtime()))  # 05/07/17
# ?0 W8 l* j/ F% vprint(strftime("%B", gmtime()))  # May
: l8 T  Y: m' Xprint(strftime("%y", gmtime()))  # 176 g- J  Q" ~4 ]
) l' ?' `1 y1 j6 z( H, {2 Y
# Convert seconds into GMT date
3 O. V$ o: ~) @3 v, a' |print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime(1234567890)))  # Fri, 13 Feb 2009 23:31:30 +0000
" B& j3 j: k  {7 X( ^. e0 P( Q& O
* ]& y/ N/ `* ~二、将天、小时、分钟转换为秒; z/ w4 H. v# J
SECONDS_PER_MINUTE = 604 Z) m/ C# r3 {: R; T, D0 P
SECONDS_PER_HOUR = 3600
& x6 v% k5 ~3 e6 b6 V( K5 NSECONDS_PER_DAY = 86400
( |& k: i: n" g- V' t$ [& p) N% o2 t* J" v2 R: d5 U; X
# 输入天、小时、分钟、秒的数量. G6 A8 k" W- ?6 P; V) s% t1 C
days = int(input("Enter number of Days: "))- [4 M2 P/ E0 N- R% n' N) B: |
hours = int(input("Enter number of Hours: "))" v, ~7 N8 q' f& ~3 Y
minutes = int(input("Enter number of Minutes: "))
' R, p1 Q4 u& p) Y4 u& Mseconds = int(input("Enter number of Seconds: "))8 W# |+ s$ H% M) K! f2 D

  j2 m6 q9 F: f/ [# 计算' K% N$ r3 r$ p; b+ a  f
total_seconds = days * SECONDS_PER_DAY& z* Z3 ^; k* b& f/ C. u. D2 H4 S
total_seconds = total_seconds + ( hours * SECONDS_PER_HOUR)! ~7 ~. C7 U% {7 j1 v
total_seconds = total_seconds + ( minutes * SECONDS_PER_MINUTE)7 \; z3 a5 f/ Y) p2 l" a1 t: p/ h" U
total_seconds = total_seconds + seconds; Z9 U* v# z- }
8 c9 ^( `- Q# S
# 结果
! o+ T# c: p9 A" j: ?print("Total number of seconds: ","%d"%(total_seconds))# h* A' w$ p( W3 Q- O) V4 b0 f" D
'''
8 d" {/ t' D" F8 n# x, A2 KEnter number of Days: 5
* e. p9 k& c; q* w2 y8 A9 U- pEnter number of Hours: 364 H( [- f) d+ O0 E+ a
Enter number of Minutes: 24  s4 n8 O$ j# a& _0 m3 X  m
Enter number of Seconds: 15% D/ i% X* F. V/ I( N( n* L
Total number of seconds: 563055
7 V: J9 r4 C+ |  u; e$ \! s'''2 E7 t& g4 ], H5 K/ Z+ n

7 O9 O* e* I% z4 \三、使用 Pandas 获取当前日期和时间
3 h* \* C# b$ m- i. yimport pandas as pd
3 }3 s$ R5 a( Q7 K, ~. ?print(pd.datetime.now())  # 2018-01-19 16:08:28.393553
6 R! |0 E* |5 h" z( E* S0 Uprint(pd.datetime.now().date())  # 2018-01-19
  A+ ]( \7 n% T- a' c' m% Yprint(pd.datetime.now().year)  # 2018. H" v( y3 X% H. z6 ]  Y- V8 E/ }
print(pd.datetime.now().month)  # 1
/ x0 P' G/ Z2 J' [# ]  ^9 @print(pd.datetime.now().day)  # 19
- v( X3 n: w: T" T: |print(pd.datetime.now().hour)  # 16/ |: O' J4 L/ j9 N
print(pd.datetime.now().minute)  # 8, q" n; m( P6 |
print(pd.datetime.now().second)  # 28# a7 T  k6 m0 ~9 e4 v! b( f
print(pd.datetime.now().microsecond)  # 394553
! j  L4 G3 ]6 e' X6 m* q! g, r5 V! }) C! V# d! f
四、将字符串转换为日期时间对象
: _) x8 i1 R+ c* o9 i( n$ e1 Lfrom datetime import datetime/ F0 S8 u# M: ^8 F) ^' n0 V8 E
from dateutil import parser2 q6 ~( x/ k% V0 C

3 @# Y0 |: K+ G" F2 U9 [d1 = "Jan 7 2015  1:15PM"
/ w* z0 _% w, ld2 = "2015 Jan 7  1:33PM"
" \' E$ s% B' g" R& s% `  B8 c
4 F) T; a1 f, ^2 Q4 U8 M, w# If you know date format
$ Y# X, @. P$ _- Ldate1 = datetime.strptime(d1, '%b %d %Y %I:%M%p'): R' `# \) I2 H1 e, `
print(type(date1))  # class 'datetime.datetime'
7 T1 N0 @' i% m2 U3 ?/ B- {6 Zprint(date1)  # 2015-01-07 13:15:00
$ M/ {/ b; F, O8 U
  Q, `* ]" L4 C# If you don't know date format8 O+ v3 _* b* s
date2 = parser.parse(d2)
2 a8 {# M: y) Y8 |print(type(date2))  # class 'datetime.datetime'
/ ], Q8 Q$ @4 I5 V, gprint(date2)  # 2015-01-07 13:33:00
' h  f6 D9 }/ i. [8 e- _5 {
  k$ w. b& Y( a7 e五、以毫秒为单位获取当前时间, z( f* z" E3 G; n% x! s8 `7 P9 ~
import time; X# k7 @" K( }4 T4 M2 F
& N5 D3 p; T; M- J
milliseconds = int(round(time.time() * 1000))
  [5 Q$ P; F7 R9 c4 iprint(milliseconds)  # 15163642706502 n$ x8 I" r0 c$ J, g8 {* c

9 _! s! \/ Z: A$ T! D* b, X- j六、以 MST、EST、UTC、GMT 和 HST 获取当前日期时间( h( @# h/ }% {
from datetime import datetime& s# ]7 \2 h: J7 S/ |+ g; u. C
from pytz import timezone0 K/ P, e3 }6 f* `

; E1 [8 c! c% [* J8 A4 wmst = timezone('MST')
6 R4 k5 h; }! H; ~! W+ [. mprint("Time in MST:", datetime.now(mst))  # Time in MST: 2017-01-19 06:06:14.495605-07:00
0 l& M/ K$ w8 y4 }' Z8 J6 _5 {est = timezone('EST')
# c$ |5 ~+ ~1 C0 Q' x2 jprint("Time in EST:", datetime.now(est))  # Time in EST: 2017-01-19 08:06:14.496606-05:00; m7 [' ?, Y8 T* V# b1 ?, s3 X! G
utc = timezone('UTC')
. q2 q! q9 ]. s# q1 Wprint("Time in UTC:", datetime.now(utc))  # Time in UTC: 2017-01-19 13:06:14.496606+00:004 L% l& K3 a% w4 f, d
gmt = timezone('GMT')
( ]8 v4 B% y4 ~: r, E+ sprint("Time in GMT:", datetime.now(gmt))  # Time in GMT: 2017-01-19 13:06:14.496606+00:00: k4 L0 a% J& ~& V" ^/ b& u* U
hst = timezone('HST')" z& Y" k5 b6 C3 R; ~
print("Time in HST:", datetime.now(hst))  # Time in HST: 2017-01-19 03:06:14.497606-10:00
) P6 m. J1 r$ z) P, J0 C
) o; t# s. i4 M$ w% g% c七、从给定的日期当中获取星期几7 o" Y; `& y% \
import datetime
9 q8 A! u$ Q9 H7 A; n
) O0 B7 _2 s/ R7 o; V+ Rdayofweek = datetime.date(2010, 6, 16).strftime("%A")
- k$ y! _! q# I( tprint(dayofweek)  # Wednesday  o' X9 }  O- |4 V2 o$ n

; E/ f2 L3 P3 }% u$ o. Y& e! N. H# weekday()方法: 0代表周一,6代表周日! K6 y! ]) g) w( j' }  ^* p, c9 r  d
print("weekday():", datetime.date(2010, 6, 16).weekday())  # weekday(): 2% ]6 z0 i# ?$ b2 q* i* O! B
. I7 [2 `6 x. m. \$ S8 Z( Q) j1 z5 @
# isoweekday() 方法: 1代表周一,7代表周日
' R5 q, e) g8 J* }8 K( A) M' Qprint("isoweekday()", datetime.date(2010, 6, 16).isoweekday())  # isoweekday() 3
4 ?6 f% n5 _8 R# u, h/ V+ L
+ n0 R8 r: l/ {# l( m2 Z+ ?dayofweek = datetime.datetime.today().strftime("%A")) e8 k& w7 V- a6 @
print(dayofweek)  # Friday
+ R  ~/ O( ~" Z# q! jprint("weekday():", datetime.datetime.today().weekday())  # weekday(): 4
* f( x8 @9 I/ p; S5 I5 Xprint("isoweekday()", datetime.datetime.today().isoweekday())  # isoweekday(): 5
- {) T! ^! ~6 H9 A
0 l, @% ]- G/ j& i八、计算两个日期时间对象之间的时差
! b) r( i9 R- i3 ^6 |' Simport datetime
7 @! r. ~4 N. E1 v$ |from datetime import timedelta
# |: P  D7 h1 i; P! {. d* I
2 w( ^1 e/ c7 I3 M2 a( odatetimeFormat = '%Y-%m-%d %H:%M:%S.%f'
4 B& p. m" n: t! R5 S# r8 ^4 Jdate1 = '2016-04-16 10:01:28.585'8 s6 J- w' Y7 u, G& Q3 T
date2 = '2016-03-10 09:56:28.067'. _8 K/ T# }4 I. z) D
diff = datetime.datetime.strptime(date1, datetimeFormat)\
# U: M9 Z8 Q. l$ x    - datetime.datetime.strptime(date2, datetimeFormat)
& j; F" h" G# Y* b) S2 s1 A& d& P
print("Difference:", diff)  # Difference: 37 days, 0:05:00.518000
: X; u9 j# W, |- K+ ]/ R2 w8 Q7 ~7 xprint("Days:", diff.days)  # Days: 37) a; y& ~, {. P/ U, }/ \3 h* l6 k
print("Microseconds:", diff.microseconds)  # Microseconds: 518000: D4 n. L6 s- h3 g/ J' k
print("Seconds:", diff.seconds)  # Seconds: 300
7 Y* w6 h4 R/ J) T, U, x, B- A! m  N. a4 R( H8 ]3 B
九、将 5 分钟添加到 Unix 时间戳
: P8 l: C0 v; }. s1 himport datetime
3 z; G1 U* E3 U6 ?7 Wimport calendar: v! h: Y- R* a+ [

  f+ z2 Z" E7 P/ Lfuture = datetime.datetime.utcnow() + datetime.timedelta(minutes=5)( s. V% [! J' x+ v5 i$ f
print(calendar.timegm(future.timetuple()))  # 1621069619! q% a0 Q! `5 `5 P% W$ u

5 b- c9 v: F( L( m. k  L# q4 I十、遍历一系列日期( H% @! ~" W, ?, x! d7 k& o
import datetime6 B! M0 _4 W. P; a& T% {

  X  P5 |: K* p6 ustart = datetime.datetime.strptime("21-06-2020", "%d-%m-%Y")
' _+ E: A) v/ O, K8 a, k! Gend = datetime.datetime.strptime("05-07-2020", "%d-%m-%Y")
0 R) [. B$ h0 `% A, Y2 D/ i8 adate_generated = [start + datetime.timedelta(days=x) for x in range(0, (end - start).days)]8 E) m/ v% ^" L! |! r
0 {" u/ J. b  n4 j: L
for date in date_generated:9 Z. P$ Q* K5 @9 G0 ?7 L
    print(date.strftime("%d-%m-%Y"))
) ^% t+ L6 \% p* Q% S% b
- d0 N' f9 f* G9 n9 `: d0 @, M" j7 z十一、巴黎时间更改为纽约时间/ F% ^. j: z$ E, j; m
import pendulum- x5 z  U  I. B# H' l

+ F/ O  f5 \+ {- [( Y% b$ \. Tin_paris = pendulum.datetime(2016, 8, 7, 22, 24, 30, tz='Europe/Paris')6 g$ G: n& h$ [5 G- M; l
print(in_paris)  # 2016-08-07T22:24:30+02:003 Q9 V  q# U0 f# I* t$ Q
; a) o( g& E! l+ b/ y, ?( Y3 Y
in_us = in_paris.in_timezone('America/New_York')+ e7 @0 v2 g7 w$ ^
print(in_us)  # 2016-08-07T16:24:30-04:003 c3 D! y. U$ V1 g+ Y1 I. J

: Y; ~* k! y% K& J2 V十二、使用 Python 获得最后7个工作日8 q1 l0 S1 g/ m( c) i3 c0 Z
from datetime import date
* b; }+ o* s9 Q: b; Ffrom datetime import timedelta) w& _8 }$ m+ g- g/ I- H- r7 X

" q8 Z* u; o8 Y! u' ~; _& ftoday = date.today()2 L3 w8 p/ [; z" j  ~

5 _& x) \! y. k1 o/ g+ Afor i in range(7):
* N7 E9 Y# L! e    d = today - timedelta(days=i)
4 V& ]( ~/ r" w% M/ {    if d.weekday() < 5:% \" X0 [; k8 _3 Z+ r2 ~- _. B7 j
        print(d)
- x) b2 R) X6 J8 I1 X% g3 G9 z* q3 b+ o* S
十三、从今天的日期和一个人的生日推算年龄. ?) ?  m4 M; Q3 o
from datetime import date
+ j4 b0 K* I& P2 H+ i, `6 }$ b4 Z# D
( Z9 ^$ T$ f6 f, a
/ _8 j, Z0 d4 `( q; ^' Adef calculate_age(born):
- ?! X0 z1 l, L9 ~! t8 d    today = date.today()
/ Q; f2 Y5 j8 B! b" B    try:; X1 _5 f/ @4 x+ L9 P& B
        birthday = born.replace(year=today.year)  R) q8 |. l/ G" S
    except ValueError:5 O8 U$ U  m$ R: a$ q
        birthday = born.replace(year=today.year, month=born.month + 1, day=1)1 a$ U# W/ l) y9 p! Z
    if birthday > today:0 A* T5 @- O1 N2 b
        return today.year - born.year - 12 a9 E# T6 E& b' b9 E
    else:
: Y" B1 }/ D1 M! s0 f9 [/ x        return today.year - born.year& g% ]$ i: V3 _" Y  O+ d/ [

7 F" F# r) h% n; C0 M* y! m6 z, g. T  D' r' m
print(calculate_age(date(2001, 3, 1)))  ?3 Y) O$ E- `5 i" X* \3 Z) u

: B- V2 R2 p0 ]6 y/ ?十四、获得本月的第一个星期二  b  V' F1 F% T2 E. g
import calendar
# Z# ^6 ]! z  s% xfrom datetime import datetime
; q0 L/ X) b* k
/ ?: V8 D4 I2 e" x; q# _c = calendar.Calendar(firstweekday=calendar.SUNDAY)
( a% I# A4 i# I$ r& hmonthcal = c.monthdatescalendar(datetime.today().year, datetime.today().month)4 |9 g- Z, t% y* E% K
#Python小白学习交流群:153708845  
' a9 I' J. }6 ^- O3 ytry:
1 m8 u! k3 {8 ]% _  y( N9 w    tues = [day for week in monthcal for day in week if# A1 ^" |# \2 G9 Z  n6 l) Y; ^
            day.weekday() == calendar.TUESDAY and day.month == datetime.today().month][0]
) V4 t, Y2 f! B    print(tues)
  k1 _- E, s. d, W: t1 Q" O- |% kexcept IndexError:
2 i$ e: C* _; B1 R    print('No date found')
, Q, Z- }" C9 A4 X" j5 c
. @. [/ B# f4 N十五、将整数转换为日期对象
9 `# {4 S; k- s. ifrom datetime import datetime: C9 e& _0 L* y4 n+ s1 `% }
' ?" e. n5 _4 Y4 ~* y' b! F- `
i = 1545730073
/ g, p* B+ s3 Z: otimestamp = datetime.fromtimestamp(i)1 d! T+ C0 w; B6 @" p; b5 x0 ~

. r3 ^+ V  C8 [' j* i/ ~9 _5 N! wprint(timestamp)  # 2018-12-25 14:57:53  C% O+ I0 t* v( Z2 t
print(type(timestamp))
  X5 a, V- \0 B. C5 g- ^: i7 h+ d9 N$ Q  Q( E; T9 l
十六、当前日期减去 N 天的天数4 l; m$ a" o! q% L, b9 y( E8 K8 ]+ M
from datetime import datetime, timedelta; s+ r' t5 }$ ^' A) X3 L
7 c& W  u1 e' ~, O: M
d = datetime.today() - timedelta(days=5)
* o. ?7 g7 m; x9 d3 f2 W% Pprint(d)
9 ?% D$ T. @* `- ]  o/ R3 N7 k0 I+ T$ _& U8 j8 X( A) J
十七、比较两个日期
1 o) {' V) T5 g, z8 i9 _. D) i+ Limport datetime
2 _& h2 d0 ?( j2 p  q
0 L1 H0 ^/ Y& ]* d* Y2 j; M, ga = datetime.datetime(2020, 12, 31, 23, 59, 59)" N  e0 p4 N2 K5 n
b = datetime.datetime(2020, 11, 30, 23, 59, 59)8 Q! @3 b6 M" d
  \# ~% d% f7 U" B
print(a < b). l5 ~$ \: w) c: e2 k
print(a > b)
- l- T* {' c5 r. z0 c) ^. W& O; \/ T$ m4 J1 d
十八、从 datetime 对象中提取年份  ]! L# E: p6 y: m( h
import datetime
: p1 x& |" U* M. T
8 d4 X  S$ E7 byear = datetime.date.today().year( E: T! t& \  \
print(year)
) U% m4 Z" h# \8 f1 v
* C9 m% v8 T' C8 h' C$ e9 e5 q: w十九、根据日期找到星期几
4 r2 q  ?: [8 V5 V) X2 i8 y. Fimport pendulum
, I1 L! J) g! P+ U3 D
4 f* v7 L& X5 |1 R! g+ wdt = pendulum.parse('2021-05-18')4 ~& ^! O. m3 P8 a  U% q3 s; r- `
print(dt.day_of_week)  # 21 P+ H$ [9 @9 `/ `3 ^( _' X

' R, S# N, r0 [7 j; l0 m( A3 ~dt = pendulum.parse('2021-05-01')
) I, K6 l& A; E9 S7 g4 Lprint(dt.day_of_week) # 6
7 {4 a, t& c. r7 w
+ b9 ]3 j/ L, U, E7 H$ o5 w2 f/ Adt = pendulum.parse('2021-05-21')
7 q) g7 f$ v8 J4 U: \4 P/ wprint(dt.day_of_week) # 5
: A- y  K2 W* L
$ P* e* [9 d. [+ H( }1 c2 `6 e8 U二十、从当前日期获取 7 天前的日期
% K. F, U- C7 Z* a6 @' Gfrom datetime import datetime, timedelta5 e5 ~! X5 G0 ^8 ]3 T  e
. a/ d! T- G1 T7 p
now = datetime.now(): Q( {) a; J" @$ H+ N6 L- j

+ y6 z. }$ w  H/ t+ L) G1 [for x in range(7):+ f+ w3 j. _6 L6 z+ y
    d = now - timedelta(days=x)7 T! r, l, @" v" _9 g9 I+ x% @
    print(d.strftime("%Y-%m-%d"))! t# I; Z% ?5 L* F5 M

8 D' y2 k: g( @! j' ~8 g% `  q# u二十一、将两个日期时间对象之间的差值转换为秒
! {. b( h! v' w; u# ^import datetime
4 ?) j9 \6 d6 ]& S" D7 g+ J% J1 x7 L: ~. }3 _
time1 = datetime.datetime.strptime('19 01 2021', '%d %m %Y')
* K' n& M( A" I+ ]time2 = datetime.datetime.strptime('25 01 2021', '%d %m %Y')
. ^* |2 F, r4 K" B  L# i
, j& ]6 ]: D2 u" kdifference = time2 - time1: O/ t+ L1 a+ T# X
print(difference)  # 6 days, 0:00:00
7 v+ B  i, \# }- f" [0 C: J1 o* ^: T5 S" x% q+ G# t' v
seconds = difference.total_seconds()
5 u+ o% _! W2 lprint(seconds)  # 518400.02 K! p( e3 k  X9 V  R- d

* `% w7 x: F4 R) @二十二、获得任何一个月的第N个星期五4 m* c) n( A( F9 k4 A7 j- z; ^
import calendar: Z, c8 y0 Y6 P+ }" ~) U

4 n& T& m. e% a3 d3 ~# 取2021年5月的第三个星期五
3 ?# }( j0 H4 [" k3 ^& cc = calendar.Calendar(firstweekday=calendar.SUNDAY)  E5 R* G, f; J# h
year = 2021- R$ V; E. I0 H8 F0 l
month = 5
: Y0 I/ @4 R  }" F  B$ F; B$ s& Pn = 2  # 取第三个' ]- I& o# c8 G  q2 W1 K5 m  ^  q
monthcal = c.monthdatescalendar(year, month)
" d' z' t. q5 T, n: L# g+ a
9 @8 r9 R9 s" Wtry:
$ c) Y5 i5 Z6 v& C! B    third_friday = [
5 W  N4 H2 h" C( P        day for week in monthcal 9 A% s& L( \" x9 e4 u) e
            for day in week if
) e7 h- d0 J/ \7 X6 [& u                day.weekday() == calendar.FRIDAY and day.month == month
1 {$ f: V, D$ e    ][n]
- s8 S7 M7 }# ]1 B% C7 h+ k    print(third_friday)  # 2021-05-21* l; G5 Q, p6 ^; j
except IndexError:9 r" V0 w8 H3 x: S' O1 X
    print('No date found')
  ?/ Y3 p) e8 @: c7 |$ `
* w8 |  R" _% R8 S4 z  l) M+ ?2 R二十三、根据周数获取日期  `/ a( w) N- y, s% `8 h* [1 I8 U
import datetime$ H- G0 ^% t& g2 c1 s8 p% ^% m% z
from dateutil.relativedelta import relativedelta6 O3 O1 }- T4 y" b9 }: ^* V
7 B' }+ s$ _. x/ G6 R
week = 25* F* {2 B, I! c: F
year = 2021
5 x1 j' u. @- P, Kdate = datetime.date(year, 1, 1) + relativedelta(weeks=+week)7 ~5 w) p" b3 }
print(date)  # 2021-06-258 y5 i6 k6 O- m3 M' W
6 X" u; C- [6 l+ G* |
二十四、获取特定日期的工作日- C2 x8 Z; L+ M+ ]) f
import datetime
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print(datetime.date(2020, 5, 15).isocalendar()[2])  # 57 V8 b) ]& E' v7 z& ^4 B4 ~( R
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二十五、创建一个 15 分钟前的 DateTime1 ?! g+ {" M0 F. X1 H' |7 Q9 V
import datetime
& W! Z: I% z9 }% L1 E2 i( _+ a% @#Python小白学习交流群:153708845  
* V+ h' J( {6 v3 D3 M. ?4 R+ M9 jdt = datetime.datetime.now() - datetime.timedelta(minutes=15)9 [: a$ l2 e+ h9 M
print(dt)  # 2021-05-15 22:25:55.8973659 P- G' \- z9 s7 ~+ B9 u% {, F
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二十六、从特定日期获取周的开始和结束日期# j' l" D2 ~- a5 u/ ]" e; P, @; V
import pendulum- [3 V' N" K! R* a, d' f
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dt = pendulum.datetime(2012, 9, 5)9 Y, W( Q5 ]) k% M3 T7 T

1 o- m! p0 ^# p; `6 R' e: V7 l# ~start = dt.start_of('week')8 E9 b, T1 d, j1 R
print(start.to_datetime_string())  # 2012-09-03 00:00:00
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& o7 R! k7 `. M3 Y* b: qend = dt.end_of('week')
% c; c, J7 C: Y; e' x0 Q. J3 |print(end.to_datetime_string())  # 2012-09-09 23:59:59# A7 r6 R' W% J
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二十七、两个日期之间的差异(以秒为单位)
. y. j( n3 o3 n( V  y) L+ D( t  Dfrom datetime import datetime
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fmt = '%Y-%m-%d %H:%M:%S'7 w" H; I; V# c2 L# t5 [
d1 = datetime.strptime('2020-01-01 17:31:22', fmt), N& K; a' G  l8 |/ W# a
d2 = datetime.strptime('2020-01-03 17:31:22', fmt)7 K) o* C& q+ D; B% a/ m

) e' w# Q. x$ B0 _, F! Ydays_diff = d2 - d18 h  h) t) k, ~+ v$ S6 a
print(days_diff.days * 24 * 60 * 60)  # 172800$ L# W5 G$ N" V8 K3 P; B
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二十八、以这种格式获取昨天的日期MMDDYY, d) V: y$ I) y9 D3 E. T
from datetime import date, timedelta
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' D+ U2 R1 ?& c# j0 x" }& j% @yesterday = date.today() - timedelta(days=1)
3 T- y- Z/ r# fprint(yesterday.strftime('%m%d%y'))  # 051421
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' }7 w8 z9 V. e3 g& ], o二十九、根据今天的日期获取上周三的日期
0 D: m4 }0 T3 w2 G* b: Rfrom datetime import date; |/ Y0 \& B' g! F( |$ ?
from datetime import timedelta0 w' H+ h8 Z0 ~) Y& q* e; X# ~

) A7 i! L# S( z9 q' w7 K. k; n* Qtoday = date.today()
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offset = (today.weekday() - 2) % 7
. v: D) U, U- I5 ?6 u" O0 Kwednesday = today - timedelta(days=offset)( P, r$ x% {8 u: t
print(wednesday)  # 2021-05-12
# f" ]' M9 N  T- Y5 U% ?* D
- O# h3 ?3 E3 D0 U* N! ~三十、所有可用时区的列表打印
5 ^/ L. d  K; @* B2 _, _import pytz
9 k( h! J) n+ d- ]7 n2 y" U* ~4 r6 y6 v# N
for i in pytz.all_timezones:
5 i5 l8 J: i( {    print(i)
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, x/ x6 r8 j% n4 r5 G8 |
# {1 m: d# M9 B
zan
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