Openerp对日期时间的操作

日期格式化字符串：DATE_FORMAT = "%Y-%m-%d"

日期时间格式字符串：DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S"

日期时间格式字符串（包含毫秒）：DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S.%f"

OpenERP对象中字段赋值为当前日期（字符串）：fields.date.context_today，fields.date.context_today(self, cr, uid, context=context)，fields.date.today()

OpenERP对象中字段赋值为当前时间（字符串）：fields.datetime.now()，fields.datetime.context_timestamp(cr, uid, datetime.now(), context=context)

OpenERP官方建议 date/datetime 的默认值的写法是：fields.date.context_today，fields.datetime.now()

字符串转换为日期时间：datetime.datetime.strptime(sale.date, DATE_FORMAT)

日期时间转换为字符串：datetime.datetime.strftime(datetime.date.today(), DATE_FORMAT)

python中获取当前日期：datetime.date.today()

python中获取当前时间：datetime.datetime.now()

OpenERP fields 单元中对 date/datetime 类中方法定义如下所示：

应用示例代码：

#自动获取日期对应的月份并保存

def _get_month(self, cr, uid, ids, field_name, arg, context=None):

res = {}

if context is None:

context = {}

DATETIME_FORMAT = "%Y-%m-%d"

for sale in self.browse(cr, uid, ids, context=context):

saledate = datetime.datetime.strptime(sale.date, DATETIME_FORMAT)

res[sale.id] = saledate.strftime('%Y') + '-' + saledate.strftime('%m')

return res

_columns={

'name':fields.char(u'单号', size=64, select=True, required=True, readonly=True),

'date':fields.date(u'日期', select=True, required=True, readonly=True),

'month':fields.function(_get_month, method=True, type='char', size=10, string = u'月份', store=True, invisible=True),

}

_defaults={

'name': lambda obj, cr, uid, context: '/',

'date':fields.date.context_today,

#'employee_id':_employee_get,

'state':'draft'

}

#自动计算到期日期，按开卡日期加 年数*365 天

def _get_due_date(self, cr, uid, ids, field_name, arg, context=None):

res = {}

if context is None:

context = {}

DATE_FORMAT = "%Y-%m-%d"

for rec in self.browse(cr, uid, ids, context=context):

category = rec.category

if category:

remaining_times=category.times_limit

if rec.active_date:

res[rec.id]=(datetime.datetime.strptime(rec.active_date, DATE_FORMAT) + datetime.timedelta(days=category.age_limit*365)).strftime(DATE_FORMAT)

else:

res[rec.id]=(datetime.date.today()+ datetime.timedelta(days=category.age_limit*365)).strftime(DATE_FORMAT)

return res

_columns={

"name":fields.char("卡号",size=64, required=True, readonly=True, states={'0':[('readonly',False)]}),

"category":fields.many2one("dispatch.service_card_category","服务卡类型", required=True, readonly=True, states={'0':[('readonly',False)]}),

'age_limit':fields.related('category', 'age_limit', string=u'年限', type='float', readonly=True, store=True),

"times_limit":fields.integer(u"初始次数", readonly=True),

"customer":fields.many2one("dispatch.customer","客户",required=True, select=True, readonly=True, states={'0':[('readonly',False)]}),

"remaining_times":fields.integer("剩余次数",required=True, readonly=True, states={'0':[('readonly',False)]}),

"active_date":fields.date("开卡日期",required=True, readonly=True, states={'0':[('readonly',False)]}),

'due_date':fields.function(_get_due_date, method=True, type='date', string = u'到期日期', store=True),

'state': fields.selection([('0', u'未开卡'),('1', u'已开卡'),('2', u'已用完'),('3', u'已过期'),('4', u'已锁定')], u'状态',required=True, readonly=True),

'lock_note': fields.char(u'锁定原因', size=200, invisible=False, readonly=True, states={'1':[('readonly',False)], '4':[('readonly',False)]}),

}

# TODO: can be improved using resource calendar method

#计算日期间隔对应的天数

def _get_number_of_days(self, date_from, date_to):

"""Returns a float equals to the timedelta between two dates given as string."""

DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S"

from_dt = datetime.datetime.strptime(date_from, DATETIME_FORMAT)

to_dt = datetime.datetime.strptime(date_to, DATETIME_FORMAT)

timedelta = to_dt - from_dt

diff_day = timedelta.days + float(timedelta.seconds) / 86400

return diff_day

#对象字段

_columns = {

'date_from': fields.datetime(u'起始日期',required=True, readonly=True, states={'draft':[('readonly',False)]}, select=True),

'date_to': fields.datetime(u'结束日期', readonly=True, states={'draft':[('readonly',False)]}),

'days': fields.float(u'天数', digits=(8, 2), readonly=True, states={'draft':[('readonly',False)]}),

}

#更改起始日期，自动计算请假天数

def onchange_date_from(self, cr, uid, ids, date_to, date_from):

"""

If there are no date set for date_to, automatically set one 8 hours later than

the date_from.

Also update the number_of_days.

"""

# date_to has to be greater than date_from

if (date_from and date_to) and (date_from > date_to):

raise osv.except_osv(_(u'警告!'),_(u'开始日期必须小于结束日期.'))

result = {'value': {}}

# No date_to set so far: automatically compute one 8 hours later

if date_from and not date_to:

date_to_with_delta = datetime.datetime.strptime(date_from, tools.DEFAULT_SERVER_DATETIME_FORMAT) + datetime.timedelta(hours=8)

result['value']['date_to'] = str(date_to_with_delta)

# Compute and update the number of days

if (date_to and date_from) and (date_from <= date_to):

diff_day = self._get_number_of_days(date_from, date_to)

result['value']['days'] = round(math.floor(diff_day))+1

else:

result['value']['days'] = 0

return result

#更改结束日期，自动计算请假天数

def onchange_date_to(self, cr, uid, ids, date_to, date_from):

"""

Update the number_of_days.

"""

# date_to has to be greater than date_from

if (date_from and date_to) and (date_from > date_to):

raise osv.except_osv(_(u'警告!'),_(u'开始日期必须小于结束日期.'))

result = {'value': {}}

# Compute and update the number of days

if (date_to and date_from) and (date_from <= date_to):

diff_day = self._get_number_of_days(date_from, date_to)

result['value']['days'] = round(math.floor(diff_day))+1

else:

result['value']['days'] = 0

return result