WireMock Cloud has two helpers for manipulating dates - now and date.

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Current date/time

The now helper renders the current date/time, with the ability to specify the format (see full reference) and offset. 
{{now}}
{{now offset='3 days'}}
{{now offset='-24 seconds'}}
{{now offset='1 years'}}
{{now offset='10 years' format='yyyy-MM-dd'}}
Dates can be rendered in a specific timezone (the default is UTC): 
{{now timezone='Australia/Sydney' format='yyyy-MM-dd HH:mm:ssZ'}}
Pass epoch as the format to render the date as UNIX epoch time (in milliseconds), or unix as the format to render the UNIX timestamp in seconds. 
{{now offset='2 years' format='epoch'}}
{{now offset='2 years' format='unix'}}

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Random date values

You can combine the now helper with random helpers to generate random dates: 
{{now offset=(join (randomInt lower=-365 upper=365) ' days' '')}} // a date somewhere between a year ago and a year in the future

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Existing date values

The date helper can be used to manipulate existing date values, changing the offset, timezone and print format in exactly the same manner as with the now helper. 
{{date myDate offset='-1 days' timezone='America/New_York' format='yyyy-MM-dd'}}

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Parsing dates from strings

Dates can be parsed from other model elements. This is mostly useful when passed to the date helper for further processing: 
{{date (parseDate request.headers.MyDate) offset='-1 days'}}

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Specifying parser format

You can specify the format to use when parsing a date via a format string: 
{{parseDate '10/11/2021' format="dd/MM/yyyy"}}
Output: 2021-11-10T00:00:00Z. Additionally you can specify unix or epoch as the format which will interpret parse a large integer denoting (respectively) seconds or milliseconds since 1st of January 1970: 
{{parseDate '1577964091000' format="epoch"}}
Output: 2020-01-02T11:21:31Z.

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Formatting dates

Date values can be formatted to strings using the dateFormat helper. You can either select a named format from the following:
  • full: full date format. For example: Tuesday, June 19, 2012
  • long: long date format. For example: June 19, 2012
  • medium: medium date format. For example: Jun 19, 2012
  • short: short date format. For example: 6/19/12
e.g. 
{{dateFormat (parseDate '2020-01-01T11:11:11Z') 'full'}} // Wednesday, January 1, 2020
Or you can specify your own format string (full reference here): 
{{dateFormat (parseDate '2020-01-01T11:11:11Z') format='yyyy-MM-dd'}} // 2020-01-01

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Format string reference

The following details all of the format string elements used when formatting and parsing dates and times:
LetterDate or Time ComponentPresentationExamples
GEra designatorTextAD
yYearYear1996 (yyyy); 96 (yy)
YWeek yearYear2009 (YYYY); 09 (YY)
MMonth in yearMonthJuly (MMMM); Jul (MMM); 07 (MM)
wWeek in yearNumber27
WWeek in monthNumber2
DDay in yearNumber189
dDay in monthNumber10
FDay of week in monthNumber2
EDay name in weekTextTuesday (EEEEEE); Tue (EEE)
uDay number of week (1 = Monday, …, 7 = Sunday)Number1
aAm/pm markerTextPM
HHour in day (0-23)Number0
kHour in day (1-24)Number24
KHour in am/pm (0-11)Number0
hHour in am/pm (1-12)Number12
mMinute in hourNumber30
sSecond in minuteNumber55
SMillisecondNumber978
zTime zoneGeneral time zonePacific Standard Time (zzzz); PST (zzz)
ZTime zoneRFC 822 time zone-0800
XTime zoneISO 8601 time zone-08 (X); -0800 (XX); -08:00 (XXX)

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Truncating dates

The truncateDate helper will truncate date/times to specific points e.g. 
{{truncateDate (parseDate '2021-06-14T00:00:00Z') 'last day of month'}}
Output: Wed Jun 30 00:00:00 UTC 2021. The full list of available truncations is:
  • first minute of hour
  • first hour of day
  • first day of month
  • first day of next month
  • last day of month
  • first day of year
  • first day of next year
  • last day of year