Programming Forums > Script Programming > Python

DaveQB · May 25th, 2006, 7:18 PM

I can't seem to find any already existing module that allows for simple time converstions. That is, the time between 6:30am and 2:30pm is ....

Sure, I could make one myself, but I thought why re-invent the wheel. Do people just make there own, or am I missing something ??

PS DateTime module doesn't seem to have any conversions/calculation functions/methods.

Dietrich · May 26th, 2006, 12:59 AM

Easy to do with module time.
Enter the two times in hh:mm:ss format, add a date and use time.strptime() and the proper format string to create two time tuples.

time.mktime() converts each time tuple to seconds since epoch. Now you can take the time difference in seconds and give the result in seconds or minutes or fractional hours.

(Toggle Plain Text)

# time difference between two (12 hour) times of a day

import time

hms1 = "08:15:00AM"
hms2 = "04:45:30PM"
mdy1 = "05/15/06 "
epoch_seconds1 = time.mktime(time.strptime(mdy1+hms1, "%m/%d/%y %I:%M:%S%p"))
epoch_seconds2 = time.mktime(time.strptime(mdy1+hms2, "%m/%d/%y %I:%M:%S%p"))
time_diff = epoch_seconds2 - epoch_seconds1
print time_diff, "seconds"
print time_diff/60, "minutes"
print time_diff/(60*60), "hours"

Arevos · May 26th, 2006, 3:02 AM

There's an easier method: use the datetime module.

(Toggle Plain Text)

import datetime

six_thirty = datetime.datetime(2006, 5, 26, 6, 30)
two_thirty = datetime.datetime(2006, 5, 26, 14, 30)

difference = two_thirty - six_thirty

print "Hours difference:", difference.seconds / 60 / 60

One thing to note is that you have to specify a date as well as a time. You cannot find the difference between two datetime.time modules. This is probably because the number of seconds between two times is sometimes different from the usual. At daylight saving time, for instance, or in the rare case of leap-seconds.

Dietrich · May 26th, 2006, 4:51 PM

Quote:

Originally Posted by Arevos

There's an easier method: use the datetime module.

(Toggle Plain Text)

import datetime

six_thirty = datetime.datetime(2006, 5, 26, 6, 30)
two_thirty = datetime.datetime(2006, 5, 26, 14, 30)

difference = two_thirty - six_thirty

print "Hours difference:", difference.seconds / 60 / 60

One thing to note is that you have to specify a date as well as a time. You cannot find the difference between two datetime.time modules. This is probably because the number of seconds between two times is sometimes different from the usual. At daylight saving time, for instance, or in the rare case of leap-seconds.

The problem here comes when you ask the user to input the times like 6:30am and 2:30pm. Now you have to prep the input for the time tuples!

Arevos · May 26th, 2006, 5:09 PM

Quote:

Originally Posted by Dietrich

The problem here comes when you ask the user to input the times like 6:30am and 2:30pm. Not all of use live in a 24 hour clock world.

Ohhhh. In which case, I agree with your solution

Dietrich · May 26th, 2006, 5:23 PM

Arevos,

thank you for datetime code. I learned that datetime.datetime() can take a short version of the time tuple!

(year,month,day,hour,min) rather than (year,month,day,hour,min,sec,weekday,yearday,dls-flag), must have defaults, very interesting.

DaveQB · Jul 3rd, 2006, 11:15 PM

Thanks for the replies guys. I mustn't of had Thread Subscribing onwhen I posted this question. I have at least 2 uses for this kind of code.

Thanks alot.

May 25th, 2006, 7:18 PM	#1
DaveQB Newbie Join Date: Apr 2006 Location: Sydney Posts: 14 Rep Power: 0	Time conversions I can't seem to find any already existing module that allows for simple time converstions. That is, the time between 6:30am and 2:30pm is .... Sure, I could make one myself, but I thought why re-invent the wheel. Do people just make there own, or am I missing something ?? PS DateTime module doesn't seem to have any conversions/calculation functions/methods.

May 26th, 2006, 12:59 AM	#2
Dietrich Professional Programmer Join Date: Feb 2005 Posts: 434 Rep Power: 4	Easy to do with module time. Enter the two times in hh:mm:ss format, add a date and use time.strptime() and the proper format string to create two time tuples. time.mktime() converts each time tuple to seconds since epoch. Now you can take the time difference in seconds and give the result in seconds or minutes or fractional hours. (Toggle Plain Text) # time difference between two (12 hour) times of a day import time hms1 = "08:15:00AM" hms2 = "04:45:30PM" mdy1 = "05/15/06 " epoch_seconds1 = time.mktime(time.strptime(mdy1+hms1, "%m/%d/%y %I:%M:%S%p")) epoch_seconds2 = time.mktime(time.strptime(mdy1+hms2, "%m/%d/%y %I:%M:%S%p")) time_diff = epoch_seconds2 - epoch_seconds1 print time_diff, "seconds" print time_diff/60, "minutes" print time_diff/(6060), "hours" # time difference between two (12 hour) times of a day import time hms1 = "08:15:00AM" hms2 = "04:45:30PM" mdy1 = "05/15/06 " epoch_seconds1 = time.mktime(time.strptime(mdy1+hms1, "%m/%d/%y %I:%M:%S%p")) epoch_seconds2 = time.mktime(time.strptime(mdy1+hms2, "%m/%d/%y %I:%M:%S%p")) time_diff = epoch_seconds2 - epoch_seconds1 print time_diff, "seconds" print time_diff/60, "minutes" print time_diff/(6060), "hours" __________________ I looked it up on the Intergnats! Last edited by Dietrich; May 26th, 2006 at 1:21 AM.

May 26th, 2006, 3:02 AM	#3
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	There's an easier method: use the datetime module. (Toggle Plain Text) import datetime six_thirty = datetime.datetime(2006, 5, 26, 6, 30) two_thirty = datetime.datetime(2006, 5, 26, 14, 30) difference = two_thirty - six_thirty print "Hours difference:", difference.seconds / 60 / 60 import datetime six_thirty = datetime.datetime(2006, 5, 26, 6, 30) two_thirty = datetime.datetime(2006, 5, 26, 14, 30) difference = two_thirty - six_thirty print "Hours difference:", difference.seconds / 60 / 60 One thing to note is that you have to specify a date as well as a time. You cannot find the difference between two datetime.time modules. This is probably because the number of seconds between two times is sometimes different from the usual. At daylight saving time, for instance, or in the rare case of leap-seconds.

May 26th, 2006, 5:23 PM	#6
Dietrich Professional Programmer Join Date: Feb 2005 Posts: 434 Rep Power: 4	Arevos, thank you for datetime code. I learned that datetime.datetime() can take a short version of the time tuple! (year,month,day,hour,min) rather than (year,month,day,hour,min,sec,weekday,yearday,dls-flag), must have defaults, very interesting. __________________ I looked it up on the Intergnats!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Jul 3rd, 2006, 11:15 PM	#7
DaveQB Newbie Join Date: Apr 2006 Location: Sydney Posts: 14 Rep Power: 0	Thanks for the replies guys. I mustn't of had Thread Subscribing onwhen I posted this question. I have at least 2 uses for this kind of code. Thanks alot.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Programming Forums > Script Programming > Python

Time conversions