This topic explains how to work with date values in Python and provides examples of date operations. It contains the following sections:
Objects and Functions for Working With Date Values
Getting Tomorrow’s and Yesterday’s Dates
Calculating the Year and Month Duration
Basics
When writing scripts we often deal with dates. There are certain date value formats and TestComplete routines that help handle dates.
Since the TestComplete scripting engine only supports OLEcompatible data types, the datetime values are implemented as floatingpoint variant values in a special format. The integer part of this value represents the number of days that have passed since December 30, 1899. The number after the decimal separator represents the fraction of a 24hour period that has elapsed. However, you do not have to understand what these floatingpoint values represent. TestComplete provides several routines that help you convert these values to their string representation (see below).
Below are some examples of datetime values and their meaning:
Value  Meaning 

0.25  December 30, 1899. 6:00 AM 
36345.5  July 4, 1999. 12:00 PM 
39094.65625  January 12, 2007. 3:45 PM 
When you are only working with date values the fractional part can be omitted.
Objects and Functions for Working With Date Values
TestComplete has the aqDateTime
object that contains methods that can be useful when operating with dates.
Method  Description 

AddDays  Adds or subtracts the specified number of days to (from) the given date. 
AddMonths  Adds or subtracts the specified number of months to (from) the given date. 
AddTime  Adds or subtracts the specified number of days, hours, minutes and seconds to (from) the given date. 
Compare  Compares two specified date/time values. 
GetDay  Returns the ordinal number of a day in a month. 
GetDayOfWeek  Returns the day of the week for the specified date. 
GetDayOfYear  Returns the ordinal number of a day in a year. 
GetMonth  Returns the month number of the specified date. 
GetYear  Returns the year number of the specified date. 
IsLeapYear  Indicates whether the specified year is a leap year. 
Now  Returns the current date and time. 
SetDateElements  Returns the Date variable having the specified year, month and day. 
SetDateTimeElements  Returns the Date variable having the specified date and time portions. 
SetSystemDateTime  Assigns the specified date and time as the system date and time. 
Today  Returns the current date. 
One more object, aqConvert
, provides methods to convert strings between date values and their string equivalents:
Method  Description 

DateTimeToFormatStr  Converts the given date value to a string using the specified format. 
DateTimeToStr  Converts the given date value to a string. 
StrToDate  Converts the specified string to a date value. 
StrToDateTime  Converts the specified string to a date/time value. 
The aqDateTime
and aqConvert
objects are available for all supported scripting languages, so that you can use them to operate with date values regardless of the chosen language.
Getting Current Date
There are two routines that return the current date: Today
and Now
. The difference between them is that the value returned by the Now
routine includes both the date and time parts, whereas the Date
routine returns only the date part. The script below demonstrates how to use them.
Python
def GetDate():
# Obtain the current date
TodayValue = aqDateTime.Today()
# Obtain the current date and time
NowValue = aqDateTime.Now()
# Convert the returned date/time values to the string values
StringTodayValue = aqConvert.DateTimeToStr(TodayValue)
StringNowValue = aqConvert.DateTimeToStr(NowValue)
# Post the converted values to the log
Log.Message("The date obtained from the Today routine is " + StringTodayValue)
Log.Message("The date obtained from the Now routine is " + StringNowValue)
# Convert the floatingpoint values to the string values
VariantTodayValue = aqConvert.FloatToStr(TodayValue)
VariantNowValue = aqConvert.FloatToStr(NowValue)
# Post the converted values to the log
Log.Message("The variant representation of TodayValue is " + VariantTodayValue)
Log.Message("The variant representation of NowValue is " + VariantNowValue)
Getting Tomorrow’s and Yesterday’s Dates
The sample below demonstrates how the aqDateTime
object can be used to calculate
tomorrow's date. The current date is obtained via the aqDateTime.Today
method. Then the current date value is incremented via the aqDateTime.AddDays
method.
The DateTimeToStr
method of the aqConvert
object is used to convert the date value to a string that is posted to the TestComplete log.
Python
def TomorrowDate():
# Obtain the current date
CurrentDate = aqDateTime.Today()
# Convert the date/time value to a string and post it to the log
Today = aqConvert.DateTimeToStr(CurrentDate)
Log.Message("Today is " + Today)
# Calculate the tomorrow's date, convert the returned date to a string and post this string to the log
Tomorrow = aqDateTime.AddDays(CurrentDate, 1)
ConvertedTomorrowDate = aqConvert.DateTimeToStr(Tomorrow)
Log.Message("Tomorrow will be " + ConvertedTomorrowDate)
return Tomorrow
Similarly, you can calculate any date that differs from the current day by a certain amount of days: yesterday, the next or previous week and so on. For example, to get yesterday’s date, you have to pass 1 as the second parameter of the aqDateTime.AddDays
method.
Python
def YesterdayDate():
# Obtain the current date
CurrentDate = aqDateTime.Today()
# Convert the date/time value to a string and post it to the log
Today = aqConvert.DateTimeToStr(CurrentDate)
Log.Message("Today is " + Today)
# Calculate the yesterday's date, convert the returned date to a string and post this string to the log
YesterdayDate = aqDateTime.AddDays(CurrentDate, 1)
ConvertedYesterdayDate = aqConvert.DateTimeToStr(YesterdayDate)
Log.Message("Yesterday was " + ConvertedYesterdayDate)
Calculating the Year and Month Duration
Generally, there are 365 days in a calendar year. However, the length of an astronomical year is about 365.242375 days, so, in the course of time, the fractional part would result in an extra day and the calendar year would lag from the astronomical year. To avoid this, the leap year that is 366 days long was invented.
The Gregorian calendar is the current standard calendar in most of the world and it adds a 29th day to February in all years evenly divisible by 4, except for centennial years (those ending in 00), which only receive the extra day if they are evenly divisible by 400. The aqDateTime
object has a special method, IsLeapYear,
that accepts the year number and returns True if the specified year is a leap year. You can use this method to get the exact number of days in the desired year:
In the example above, a Boolean value was added to an integer, since in Python, Booleans have a numerical value of 0 (False) or 1 (True).
Using the IsLeapYear
method, you can get the number of days in the month. For all months, except for February, the duration of a month is fixed and is either 30 or 31 days. The duration of February is either 28 or 29 days, depending on whether the current year is a leap year or not. The routine that gets the month duration would be the following:
Python
def DaysInMonth(MonthNo, YearNo):
if MonthNo == 1 or MonthNo == 3 or MonthNo == 5 or MonthNo == 7 or MonthNo == 8 or MonthNo == 10 or MonthNo == 12:
return 31
elif MonthNo == 2:
if aqDateTime.IsLeapYear(YearNo):
return 29
else:
return 28
elif MonthNo == 4 or MonthNo == 6 or MonthNo == 9 or MonthNo == 11:
return 30
Comparing Dates
To compare date/time values, use the aqDateTime.Compare
method rather than comparison operators (like ==, >, <, != and others) provided by the scripting engine:
Python
def compare(DateTime1, DateTime2):
r = aqDateTime.Compare(DateTime1, DateTime2)
if r > 0:
# DateTime1 > DateTime2
...
else:
if r < 0:
# DateTime1 < DateTime2
...
else:
# DateTime1 == DateTime2
...
This note does not concern the Date
objects provided by the Python engine. To compare Date
objects, use the features provided by the engine.
Encoding and Decoding Date Values
Since date values are represented as variants, special routines are required for converting a variant value to a calendar date and vice versa. These operations are performed by the SetDateElements, GetYear, GetMonth and GetDay methods of the aqDateTime
object. These methods take into account whether the current year is a leap year and the number of days in a month so that the resulting value is guaranteed to be valid. The SetDateElements
method accepts the parts of a date and returns a variant date value.
Python
def EncodeDateDemo():
# Create a Date variable having the specified year, month and day values
myDate = aqDateTime.SetDateElements(2005, 12, 25)
# Convert the value of the myDate variable to a string using the specified format and post this string to the log
EncodedDate = aqConvert.DateTimeToFormatStr(myDate,"%B/%#d/%Y")
Log.Message("The encoded date is "+ EncodedDate)
# Convert the value of the myDate variable to a variant value and post it to the log
VariantDate = aqConvert.IntToStr(myDate)
Log.Message("The variant representation of it is "+ VariantDate)
The GetYear
, GetMonth
and GetDay
methods accept the variant datetime value and return the respective date parts of that value. Below is an example of how to use these routines:
Python
def DecodeDateDemo():
# Obtain the current date
CurrentDate = aqDateTime.Today()
# Return the parts of the current date value and then post them to the log
Year = aqDateTime.GetYear(CurrentDate)
Month = aqDateTime.GetMonth(CurrentDate)
Day = aqDateTime.GetDay(CurrentDate)
Log.Message(str(Day) + " day(s) have passed since the beginning of the " + str(Month) + " month of " + str(Year) + " year.")
Modifying Date Values
Despite the fact that datetime values are represented as floatingpoint numbers, you cannot explicitly use ordinary arithmetic operators to change dates or times. However, the aqDateTime
scripting object provides a number of methods that were especially designed to modify datetime values. These methods are: AddMonths
, AddDays
and AddTime
. The AddTime
method allows you to modify the date and time portions at once.
As you may notice from the Getting Tomorrow’s and Yesterday’s Dates section, these methods are used both for incrementing and decrementing datetime values. When a positive number is passed as Month, Days or another parameter, then the resulting value is increased. If the parameter is negative, then the resulting value is decreased.
These methods take into account the number of days in the month, whether the year is a leap year and other aspects of time calculations, which guarantees that the resulting value will be valid.
The code below demonstrates how to use these methods:
Python
def ModifyDates():
Date = aqDateTime.SetDateElements(2007, 1, 25)
# Increase the date by 7 days
# Note the month changing
AlteredDate = aqDateTime.AddDays(Date, 7)
Log.Message("Initial date: " + aqConvert.DateTimeToStr(Date))
Log.Message("Altered date 1: " + aqConvert.DateTimeToStr(AlteredDate))
# Increase the date by one month
# Note that 28 days were added since the month is February
AlteredDate = aqDateTime.AddMonths(AlteredDate, 1)
Log.Message("Altered date 2: " + aqConvert.DateTimeToStr(AlteredDate))
# Decrease the date by 1 day
AlteredDate = aqDateTime.AddTime(AlteredDate, 1, 0, 0, 0)
Log.Message("Altered date 3: " + aqConvert.DateTimeToStr(AlteredDate))
Dealing With Week Days
Besides recognizing a date, month and year, you may need to know which day of the week a certain date falls on. The aqDateTime.GetDayOfWeek
method performs this task. It accepts a variant date and returns the number of the week day that corresponds to it. The returned number ranges between 1 and 7, where 1 corresponds to Sunday, 2  to Monday, and so on. The sample code below obtains the current date, calculates the day of the week and posts the name of the day to the log.
Python
def DayOfWeekDemo():
WeekDay = aqDateTime.GetDayOfWeek(aqDateTime.Today())
if WeekDay == 1:
DayName = "Sunday"
elif WeekDay == 2:
DayName = "Monday"
elif WeekDay == 3:
DayName = "Tuesday"
elif WeekDay == 4:
DayName = "Wednesday"
elif WeekDay == 5:
DayName = "Sunday"
elif WeekDay == 6:
DayName = "Thursday"
elif WeekDay == 7:
DayName = "Friday"
elif WeekDay == 8:
DayName = "Saturday"
Log.Message("Today is " + DayName)
Note: 
The GetDayOfWeek method uses the United States system of week notation where the week is considered to start on Sunday and end on Saturday. However, the ISO 8601 “Data elements and interchange formats  Information interchange  Representation of dates and times” standard recommends another system of week notation. In this system, the week starts on Monday and ends on Sunday. To convert a US week day number to ISO 8601, you can use the following routine:
The result of this function is also an integer number, but 1 corresponds to Monday, 2 to Tuesday and so on.

In addition to the day of the week, you can determine the dates when the week starts and ends. This can be done using the following two routines. Here, the number of a week day is subtracted from the specified date to get the beginning of the week, and to get the end of the week, six days are added to the calculated date.
Python
def StartOfWeek (InputDate):
# If the input parameter is omitted then current date is taken
if InputDate == None:
InputDate = aqDateTime.Today()
# Using US week day number
return aqDateTime.AddDays(InputDate,  aqDateTime.GetDayOfWeek(InputDate) + 1)
# Using ISO week day number
# return aqDateTime.AddDays(InputDate,  ISODayOfWeek(InputDate) + 1)
def EndOfWeek (InputDate):
# If the input parameter is omitted then current date is taken
if InputDate == None:
InputDate = aqDateTime.Today()
# Using US week day number
return aqDateTime.AddDays(InputDate,  aqDateTime.GetDayOfWeek(InputDate) + 7)
# Using ISO week day number
# return aqDateTime.AddDays(InputDate,  ISODayOfWeek(InputDate) + 7)
Note: 
Since the routines use the aqDateTime.GetDayOfWeek method, which returns a US week day number, the dates returned by the routines are Sunday and Saturday. To use the ISO 8601 week day notation, you should use the last code line where the aqDateTime.GetDayOfWeek call is replaced with a call to the ISODayOfWeek function. (The code of the ISODayOfWeek function is provided in the note above.) In this case, the first routine will return the date that falls on Monday and the second routine  the date that falls on Sunday.

Another frequent operation when dealing with dates is calculating the number of weeks that have passed since the beginning of the year. First, you should clarify what week should be considered as the first week of the year. According to the ISO 8601 standard, the first week of a year is a week with the majority (four or more) of days in the starting year. In our case, it is better to use another definition of the first week: the week with the date January, 4th.
Below is a routine that calculates the week number in compliance with this rule. It accepts the date, determines whether the week is the first one, and then calculates the week number as a difference between the end of specified week and the end of the first week divided by 7..
Python
def WeekNumber(InputDate):
YearNo = aqDateTime.GetYear(InputDate)
EndOfFirstWeek = EndOfWeek(aqDateTime.SetDateElements(YearNo,1,4))
EndOfCurrentWeek = EndOfWeek(InputDate)
return 1 + (aqDateTime.GetDayOfYear(EndOfCurrentWeek)  aqDateTime.GetDayOfYear(EndOfFirstWeek)) / 7
Sometimes, it is useful to know on what day of the week the desired month starts or ends. The routines below return the week day numbers that correspond to the beginning and to the end of the month. They have only one input parameter that specifies the date that belongs to the desired month. If the parameter is missing, then the routines return the results for the current month. These routines calculate the day of the month in a similar way the routines above calculate the number of the week.
Python
def StartOfMonthDay (InputDate):
# If the input parameter is omitted then current date is taken
if InputDate == None:
InputDate = aqDateTime.Today()
StartDate = aqDateTime.AddDays(InputDate,  aqDateTime.GetDay(InputDate)+1)
# Using US week day number
return aqDateTime.GetDayOfWeek(StartDate)
# Using ISO week day number
# return ISODayOfWeek(StartDate)
def EndOfMonthDay (InputDate):
# If the input parameter is omitted then current date is taken
if InputDate == undefined:
InputDate = aqDateTime.Today()
DayNo = aqDateTime.GetDay(InputDate)
MonthNo = aqDateTime.GetMonth(InputDate)
YearNo = aqDateTime.GetYear(InputDate)
EndDate = aqDateTime.AddDays(InputDate,  DayNo + DaysInMonth(MonthNo, YearNo))
# Using US week day number
return aqDateTime.GetDayOfWeek(EndDate)
# Using ISO week day number
# return ISODayOfWeek(EndDate)
See Also
Working With Dates
Python  Working With Time Values
aqDateTime Object