Waltham, Massachusetts is located in the Eastern Time Zone, which means that the time is Eastern Standard Time (EST) during regular time
and Eastern Daylight Time (EDT) when daylight savings is in effect.
Eastern Standard Time
When it is Eastern Standard Time, Waltham, Massachusetts is UTC-05:00 which means that it is -5 hours offset from
Coordinated Universal Time (UTC).
The Eastern Standard Time in Waltham, Massachusetts (UTC-05:00) is shown in blue below:
Eastern Daylight Time
When it is Eastern Daylight Time, Waltham, Massachusetts will be UTC-04:00 which means that it is -4 hours
offset from Coordinated Universal Time (UTC) and the time will be as follows in green:
As you can see, the difference between EST and EDT in Waltham, Massachusetts is one hour, because the daylight savings is
adjusted by one hour.
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